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    C Language Interview Questions

    Rumman Ansari September 17, 2026 37 views Subject Details
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    Question 1
    Differentiate Source Codes from Object Codes
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    Question 2
    What is the significance of an algorithm to C programming?
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    Question 3
    Is it possible to create your own header files?
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    Question 4
    What is C language?
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    Question 5
    Who developed C language?
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    Question 6
    Describe about history of C programming language.
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    Question 7
    Who is the founder of C language?
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    Question 8
    What are the different file extensions involved when programming in C?
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    Question 9
    Where is C programming language used or uses of C language?
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    Question 10
    What is the difference between top down approach and bottom up approach in programming languages?
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    Question 11
    C language has been developed in which language?
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    Question 12
    Which year C language is developed?
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    Question 13
    What is meant by programming language and give some examples?
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    Question 14
    Describe about C standards.
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    Question 15
    What is embedded C?
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    Question 16
    What is the difference between structured oriented, object-oriented and non-structure oriented…
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    Question 17
    What is meant by protocol?
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    Question 18
    List out some of C compilers.
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    Question 19
    Is C language case sensitive?
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    Question 20
    Why is C known as a mother language?
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    Question 21
    Why is C called a mid-level programming language?
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    Question 22
    What is command line argument?
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    Question 23
    What is the acronym for ANSI?
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    Question 24
    Who is the main contributor in designing the C language after Dennis Ritchie?
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    Question 25
    Why is C considered a foundational programming language?
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    Question 26
    What makes C faster compared to other languages?
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    Question 27
    Why is C still used today even after the rise of modern languages?
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    Question 28
    How does learning C help in understanding computer memory?
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    Question 29
    Why is C often called a middle-level language?
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    Question 30
    What are some popular applications built using C?
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    Question 31
    Why is C preferred for system-level programming?
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    Question 32
    How does C give programmers better control over hardware?
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    Question 33
    Why is C commonly used in embedded systems?
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    Question 34
    What makes C suitable for writing operating systems?
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    Question 35
    How does C help programmers understand how compilers and memory management work?
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    Question 36
    What advantages does C provide in terms of performance and optimization?
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    Question 37
    Why is C used for building compilers and interpreters?
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    Question 38
    Why do modern languages have components written in C?
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    Question 39
    How does pointer usage in C give an advantage?
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    Question 40
    How does C allow fine-grained control over memory allocation?
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    Question 41
    Why do developers prefer C for creating high-performance libraries?
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    Question 42
    How does C influence the design of modern programming languages?
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    Question 43
    Why is C favored in industries like robotics, IoT, and automotive?
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    Question 44
    How does the portability of C programs contribute to its relevance?
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    Question 45
    Why is C used for real-time system development?
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    Question 46
    Explain how C supports low-level operations better than high-level languages.
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    Question 47
    Why choose C over Python or Java for microcontroller firmware?
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    Question 48
    Your project requires maximum speed and minimal memory consumption. How does C help?
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    Question 49
    You need to interact with hardware registers. Why use C?
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    Question 50
    When would C NOT be the best choice?
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    Question 51
    How does learning C make it easier to learn other programming languages?
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    Question 52
    Why did you choose to learn C programming?
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    Question 53
    How has learning C improved your problem-solving skills?
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    Question 54
    What is one advantage of C that will keep it relevant for the next 20 years?
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    Question 55
    Which level is C language belonging to?
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    Question 56
    What do you mean by high level, middle level and low level languages and give an example for each?
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    Question 57
    What is a compiler?
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    Question 58
    What is the difference between assembler, compiler and interpreter?
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    Question 59
    Why is C language being considered a middle level language?
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    Question 60
    What are the key features of C language or what are the characteristics of C language?
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    Question 61
    What are the features of the C language?
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    Question 62
    What is the difference between C and C++?
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    Question 63
    What is the difference between C and Java?
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    Question 64
    What are main characteristics of C language?
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    Question 65
    What is printf()?
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    Question 66
    What is scanf()?
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    Question 67
    Execution of a C program starts from which function?
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    Question 68
    What is IDE?
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    Question 69
    What is header file in C language?
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    Question 70
    What is void in C?
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    Question 71
    What is the syntax for comments in C?
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    Question 72
    What is the difference between getch() and getche()?
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    Question 73
    Write a program to print hello world
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    Question 74
    Which compiler switch to be used for compiling the programs using math library with gcc compiler?
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    Question 75
    Can the curly brackets { } be used to enclose a single line of code?
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    Question 76
    What are header files and what are its uses in C programming?
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    Question 77
    What is syntax error?
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    Question 78
    Can two or more operators such as and be combined in a single line of program code?
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    Question 79
    Why is it that not all header files are declared in every C program?
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    Question 80
    What are compound statements?
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    Question 81
    What is wrong in this statement? scanf("%d",whatnumber);
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    Question 82
    What are comments and how do you insert it in a C program?
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    Question 83
    What are reserved words?
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    Question 84
    Not all reserved words are written in lowercase. TRUE or FALSE?
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    Question 85
    What are run-time errors?
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    Question 86
    What is the difference between functions abs() and fabs()?
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    Question 87
    What is the general form of a C program?
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    Question 88
    What is the use of a semicolon (;) at the end of every program statement?
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    Question 89
    What are all the sections that a C program may have and must have?
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    Question 90
    What is the use of printf() and scanf() functions?
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    Question 91
    Can we compile a program without main() function?
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    Question 92
    What is a token?
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    Question 93
    What is token in C?
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    Question 94
    What are the types of C tokens?
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    Question 95
    What is a token?
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    Question 96
    What is the newline escape sequence?
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    Question 97
    What is the purpose of the keyword typedef?
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    Question 98
    Which key word is used to perform unconditional branching?
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    Question 99
    When is the "void" keyword used in a function?
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    Question 100
    What is Standard Header Files ?
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    Question 101
    What is keyword in C?
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    Question 102
    List out some keywords available in C language.
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    Question 103
    What is the maximum length of an identifier?
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    Question 104
    What is identifier in C?
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    Question 105
    What are format specifiers in C?
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    Question 106
    What are Format Specifiers in C and why are they important?
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    Question 107
    What is the syntax and structure of Format Specifiers in C?
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    Question 108
    What are the most commonly used Format Specifiers in C?
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    Question 109
    How are Format Specifiers used in printf() function?
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    Question 110
    How are Format Specifiers used in scanf() function?
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    Question 111
    Describe the history of C programming language.
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    Question 112
    When was C language developed?
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    Question 113
    Can I use "int" data type to store the value 32768? Why?
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    Question 114
    Where is the auto variables stored?
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    Question 115
    Can we specify variable field width in a scanf() format string? If possible how?
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    Question 116
    What are global variables and how do you declare them?
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    Question 117
    What is Variable Declaration ?
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    Question 118
    What is variable in C?
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    Question 119
    What is the difference between constant and variable in C?
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    Question 120
    Can variable name start with numbers?
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    Question 121
    What is the difference between variable declaration and variable definition in C?
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    Question 122
    What are the different types of variable in C?
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    Question 123
    Invalid Variable Names and Reasons
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    Question 124
    Errors in C Statements
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    Question 125
    What is the difference between variable declaration and variable definition? ( in a line)
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    Question 126
    What is variable initialization and why is it important?
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    Question 127
    What is wrong with this program statement? void = 10;
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    Question 128
    Is this program statement valid? INT = 10.50;
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    Question 129
    Where an automatic variable is stored?
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    Question 130
    What is Blocks and Scope in c ?
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    Question 131
    What is Variable Storage Classes?
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    Question 132
    What is local variable in C?
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    Question 133
    What does static variable mean?
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    Question 134
    What is the use of a static variable in C?
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    Question 135
    What is static memory allocation?
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    Question 136
    What is an auto keyword in C?
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    Question 137
    What is global variable in C?
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    Question 138
    What is the difference between the local variable and global variable in C?
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    Question 139
    What is storage class? What are the different storage classes in C?
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    Question 140
    What is environment variable in C?
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    Question 141
    What is the difference between auto variable and register variable in C?
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    Question 142
    What is the difference between auto variable and static variable in C?
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    Question 143
    What is l-value and r-value?
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    Question 144
    What are variables and it what way is it different from constants?
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    Question 145
    What is constant in C?
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    Question 146
    What are the types of constants in C?
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    Question 147
    What is the difference between a variable and a constant in C programming?
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    Question 148
    What are enumerations?
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    Question 149
    Explain the use of comma operator (,).
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    Question 150
    Describe the order of precedence with regards to operators in C.
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    Question 151
    What are enumerated types?
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    Question 152
    What is enum in C?
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    Question 153
    What is operator in C?
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    Question 154
    What are the different types of operator in C?
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    Question 155
    What is & and * operators in C?
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    Question 156
    What value will be assigned to the variable X if a = 10, b = 20, c = 30, d = 40 for the expression…
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    Question 157
    What is the value assigned to the following variables? int X1 = 13/3; int X2 = 13%3;
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    Question 158
    Evaluation of Expressions and Hierarchy
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    Question 159
    Conversion of Equations into C Statements
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    Question 160
    S++ or S = S+1, which can be recommended to increment the value by 1 and why?
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    Question 161
    Where the address of operator (&) cannot be used for?
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    Question 162
    What is reminder for 5.0 % 2?
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    Question 163
    How do you construct an increment statement or decrement statement in C?
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    Question 164
    What is the modulus operator?
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    Question 165
    What is arithmetic operator in C?
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    Question 166
    What is the difference between the expression "++a" and "a++"?
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    Question 167
    What is the relational operator in C?
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    Question 168
    What does the && operator do in a program code?
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    Question 169
    What is the bitwise operator in C?
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    Question 170
    What is || operator and how does it function in a program?
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    Question 171
    What is the logical operator in C?
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    Question 172
    What is the difference between the = symbol and == symbol?
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    Question 173
    What is assignment operator in C?
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    Question 174
    What is the difference between pre increment operator and post increment operator?
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    Question 175
    What is the difference between pre decrement operator and post decrement operator?
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    Question 176
    How many operators are there under the category of ternary operators?
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    Question 177
    What is the use of a ? character?
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    Question 178
    Which of the following operators is incorrect and why? ( >=,
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    Question 179
    What is the syntax for ternary operator in C?
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    Question 180
    What is the use of sizeof() function in C?
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    Question 181
    What are all decision control statements in C?
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    Question 182
    How will you print numbers from 1 to 100 without using a loop?
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    Question 183
    What is an endless loop?
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    Question 184
    What are all loop control statements in C?
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    Question 185
    What is an infinite loop?
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    Question 186
    What is the difference between while and do-while loops in C and Java?
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    Question 187
    Differentiate between for loop and a while loop? What are its uses?
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    Question 188
    Explain the syntax for for loop.
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    Question 189
    What is a nested loop?
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    Question 190
    Write a loop statement that will show the following output:112123123412345
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    Question 191
    What are the different types of control structures in programming?
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    Question 192
    What is the use of goto statement?
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    Question 193
    What is the meaning of base address of the array?
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    Question 194
    How do you access the values within an array?
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    Question 195
    What is the advantage of an array over individual variables?
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    Question 196
    Describe how arrays can be passed to a user defined function
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    Question 197
    What is the right way to Initialize array?
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    Question 198
    Can array subscripts have negative value in C?
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    Question 199
    What is an array in C?
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    Question 200
    Difference between arrays and linked list?
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    Question 201
    What are multidimensional arrays?
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    Question 202
    How do you declare a variable that will hold string values?
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    Question 203
    What is wrong with this statement? myName = "Nurujjaman";
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    Question 204
    How do you determine the length of a string value that was stored in a variable?
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    Question 205
    How do you convert strings to numbers in C?
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    Question 206
    What is the difference between memcpy() and memmove() functions in C?
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    Question 207
    What is the difference between strcpy() and strncpy() functions in C?
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    Question 208
    What is the difference between array and string in C?
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    Question 209
    Explain the use of %i format specifier w.r.t scanf().
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    Question 210
    How can you print a (backslash) using any of the printf() family of functions.
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    Question 211
    What is a static function?
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    Question 212
    How do you generate random numbers in C?
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    Question 213
    What could possibly be the problem if a valid function name such as tolower() is being reported by…
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    Question 214
    What are actual arguments?
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    Question 215
    What does the function toupper() do?
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    Question 216
    Is it possible to have a function as a parameter in another function?
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    Question 217
    What is the difference between functions getch() and getche()?
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    Question 218
    Can you pass an entire structure to functions?
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    Question 219
    What is gets() function?
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    Question 220
    How do you search data in a data file using random access method?
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    Question 221
    Is there a built-in function in C that can be used for sorting data?
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    Question 222
    What is the use of the function in C?
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    Question 223
    What is function prototype?
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    Question 224
    What are static functions? What is their use?
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    Question 225
    What are the different ways of passing parameters to the functions? Which to use when?
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    Question 226
    What is the difference between Call by Value and Call by Reference? C Language
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    Question 227
    Example of call by value in C Program
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    Question 228
    Out of fgets() and gets() which function is safe to use and why?
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    Question 229
    Difference between strdup and strcpy?
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    Question 230
    Where should type cast function not be used in C?
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    Question 231
    What is static function in C?
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    Question 232
    If you want to execute C program even after main function is terminated, which function can be used?
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    Question 233
    Is it possible to call atexit() function more than once in a C program?
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    Question 234
    What is exit() function in C?
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    Question 235
    What is the difference between exit() and return() in C?
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    Question 236
    Is there any inbuilt library function in C to remove leading and trailing spaces from a string? How…
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    Question 237
    What is the difference between Strings and Arrays?
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    Question 238
    What are command line arguments?
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    Question 239
    What is the difference between memcpy() and strcpy() functions in C?
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    Question 240
    Which function in C can be used to append a string to another string?
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    Question 241
    What is the purpose of built-in stricmp() function.
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    Question 242
    What is recursion?
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    Question 243
    What is recursion in C?
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    Question 244
    What is a dangling pointer? in one line
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    Question 245
    What is a NULL statement?
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    Question 246
    What are pointers?
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    Question 247
    What is file pointer in C?
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    Question 248
    When can void pointer and null pointer be used in C?
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    Question 249
    What is const pointer in C?
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    Question 250
    What is the usage of the pointer in C?
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    Question 251
    What is pointer to pointer in C?
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    Question 252
    What is Dangling pointer?
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    Question 253
    What is a pointer to a function? Give the general syntax for the same.
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    Question 254
    What is the advantage of declaring void pointers?
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    Question 255
    When to user -> (arrow) operator.
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    Question 256
    What is the difference between call by value and call by reference in C?
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    Question 257
    Example of call by reference in C Program
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    Question 258
    What is a self-referential structure?
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    Question 259
    What are bit fields?
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    Question 260
    What are structure types in C?
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    Question 261
    What is the structure?
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    Question 262
    What are the differences between structures and arrays?
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    Question 263
    What is the use of typedef?
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    Question 264
    What is a union?
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    Question 265
    What are the differences between structures and union?
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    Question 266
    What the advantages of using Unions?
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    Question 267
    What is a union?
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    Question 268
    Explain the purpose of the function sprintf().
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    Question 269
    Describe the file opening mode "w+".
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    Question 270
    Are comments included during the compilation stage and placed in the EXE file as well?
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    Question 271
    Is FILE a built-in data type?
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    Question 272
    What is a sequential access file?
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    Question 273
    What does the characters "r" and "w" mean when writing programs that will make use of files?
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    Question 274
    What is the difference between text files and binary files?
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    Question 275
    What is the advantage of a random access file?
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    Question 276
    What is the purpose of sprintf() function?
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    Question 277
    What are the functions to open and close the file in C language?
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    Question 278
    What are macros? What are its advantages and disadvantages?
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    Question 279
    What is dynamic memory allocation?
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    Question 280
    What functions are used for dynamic memory allocation in C language?
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    Question 281
    Distinguish between malloc() and calloc() memory allocation.
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    Question 282
    What is the difference between malloc() and calloc()?
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    Question 283
    What is a preprocessor?
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    Question 284
    How will you print
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    Question 285
    What is Macro? Why do we use the macro?
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    Question 286
    What is the use of #define in C?
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    Question 287
    What is ## operator in C?
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    Question 288
    What is pragma in C? Or how will you execute functions before and after main function in C program?
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    Question 289
    How will you override an existing macro in C?
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    Question 290
    How to check whether macro is defined or not in a C program?
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