C Programming Language Video Bangla - Quiz

Q: Which of the following comments about the ++ operator is correct?

A. It is a unary operator and It associates from the right
B. The operand can come before or after the operator
C. It cannot be applied to an expression
D. All of the above

Correct Option: D
Remarks:

Explanation: All of the above

Q: for c = 2, value of c after c <<= 1;

A. c = 1;
B. c = 2;
C. c = 3;
D. c = 4

Correct Option: D
Remarks:

Explanation: c = 4

Q: What is the output of this C code?


#include<stdio.h> 
int main()
    {
        int a = 1, b = 2;
        a += b -= a;
        printf("%d %d", a, b);
    }

A. 1 1
B. 1 2
C. 2 1
D. 2 2

Correct Option: C
Remarks:

Explanation: 2 1

Q: What is the output of this C code?


    int main()
    {
        int a = 4, n, i, result = 0;
        scanf("%d", n);
        for (i = 0;i < n; i++)
        result += a;
    }

A. Addition of a and n.
B. Subtraction of a and n.
C. Multiplication of a and n.
D. Division of a and n.

Correct Option: C
Remarks:

Explanation: Option C

Q: What is the output of this C code?

    int main()
    {
        int a = 2;
        if (a >> 1)
           printf("%d\n", a);
    }

B. 1
C. 2
D. No output

Correct Option: C
Remarks:

Explanation: Option C

Q: What is the output of this C code?

    void main()
    {
        int x = 4;
        int *p = &x;
        int *k = p++;
        int r = p - k;
        printf("%d", r);
    }

A. 4
B. 8
C. 1
D. Run time error

Correct Option: C
Remarks:

Explanation: Option C

Q: Are logical operators sequence points?

A. True
B. False
C. Depends on the compiler
D. Depends on the standard

Correct Option: A
Remarks:

Explanation: Option A

Q: Does logical operators in C language are evaluated with short circuit?

A. True
B. False
C. Depends on the compiler
D. depends on the standard

Correct Option: A
Remarks:

Explanation:

Option A

A: Yes, logical operators in the C language are evaluated using short-circuit evaluation. Short-circuit evaluation means that the evaluation of the second operand is skipped if the result of the entire expression can be determined by evaluating only the first operand.

In C, there are two main logical operators: && (logical AND) and || (logical OR). Here's how short-circuit evaluation works for each of them:

Logical AND (&&):
- If the left operand is false (0), the overall expression is false, and the right operand is not evaluated because the result is already determined.
- If the left operand is true (non-zero), the right operand is evaluated only if the left operand doesn't guarantee the overall result. This is because if the left operand is true, the overall expression's truth value depends on the right operand.

Example:


if (a > 0 && b > 0) {
    // Both a and b are evaluated, but only if a > 0 is true
}

Logical OR (||):
- If the left operand is true (non-zero), the overall expression is true, and the right operand is not evaluated because the result is already determined.
- If the left operand is false (0), the right operand is evaluated only if the left operand doesn't guarantee the overall result. This is because if the left operand is false, the overall expression's truth value depends on the right operand.

Example:


if (x == 0 || y == 0) {
    // Both x and y are evaluated, but only if x == 0 is false
}

Using short-circuit evaluation can have performance implications and can be used to optimize code. For example, if you have a conditional statement where the second operand's evaluation is costly, you can place it as the right operand of a logical AND operator so that it's evaluated only if necessary.

Keep in mind that short-circuit evaluation behavior may vary across programming languages, so it's important to understand the specific behavior of logical operators in the language you are using.

Q: Loop ______ the program code.

A. elongates
B. strengthens
C. reduces
D. none of these

Correct Option: C
Remarks:

Explanation:

Loop reduces the program code.

Using loops in programming helps to reduce redundancy by allowing a set of instructions to be executed repeatedly without having to write the same code multiple times. This makes the code more concise and easier to maintain.

Q: If 'while loop" is used within a "while loop", is called a ............ loop.

A. nested while
B. nested do while
C. nested for
D. simple loop

Correct Option: A
Remarks:

Explanation:

If a 'while loop' is used within a 'while loop', it is called a nested while loop.

C Programming Language Video Bangla - Quiz

Which of the following comments about the ++ operator is correct?

for c = 2, value of c after c <<= 1;

What is the output of this C code?

What is the output of this C code?

What is the output of this C code?
int main() { int a = 2; if (a >> 1) printf("%d\n", a); }

What is the output of this C code?
void main() { int x = 4; int p = &x; int k = p++; int r = p - k; printf("%d", r); }

Are logical operators sequence points?

Does logical operators in C language are evaluated with short circuit?

Loop ______ the program code.

If 'while loop" is used within a "while loop", is called a ............ loop.

C Programming Language Video Bangla - Quiz

Which of the following comments about the ++ operator is correct?

for c = 2, value of c after c <<= 1;

What is the output of this C code? #include<stdio.h> int main() { int a = 1, b = 2; a += b -= a; printf("%d %d", a, b); }

What is the output of this C code? int main() { int a = 4, n, i, result = 0; scanf("%d", n); for (i = 0;i < n; i++) result += a; }

What is the output of this C code? int main() { int a = 2; if (a >> 1) printf("%d\n", a); }

What is the output of this C code? void main() { int x = 4; int *p = &x; int *k = p++; int r = p - k; printf("%d", r); }

Are logical operators sequence points?

Does logical operators in C language are evaluated with short circuit?

Loop ______ the program code.

If 'while loop" is used within a "while loop", is called a ............ loop.

What is the output of this C code?

What is the output of this C code?

What is the output of this C code?
int main() { int a = 2; if (a >> 1) printf("%d\n", a); }

What is the output of this C code?
void main() { int x = 4; int p = &x; int k = p++; int r = p - k; printf("%d", r); }