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Overview of C Language 1 First Program in C Hello World 2 Basic Structure of C Programming 3 Tokens in C 4 Keywords in C 5 Identifiers in C 6 Format Specifiers 7 Format Specifiers Examples 8 History of C

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Data Types in C Language 1 int Data Type in C 2 float Data Type in C 3 double Data Type in C 4 char Data Type in C

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Constant in C Language 1 Constants in C

Operators and Enums in C Language 1 Introduction to Operator in C 2 Arithmetic Operators in C 3 Relational Operators in C 4 Bit-wise Operators in C 5 Logical Operators in C 6 Assignment Operators in C 7 Conditional Operator in C 8 sizeof() Operator in C 9 Operator Precedance in C language 10 ASCII Value

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String in C Language 1 Introduction to String

Function in C Language 1 Function in C 2 Function Calling in C 3 return type in Function 4 Call by Value in C 5 User Define Function 6 Predefined Functions

String functions in C 1 All String Functions 2 strcat() function 3 strncat() function 4 strcpy() function 5 strncpy() function 6 strlen() function 7 strcmp() function 8 strcmpi() function 9 strchr() function 10 strrchr() function 11 strstr() function 12 strrstr() function 13 strdup() function 14 strlwr() function 15 strupr() function 16 strrev() function 17 strset() function 18 strnset() function 19 strtok() function

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Pointer in C Language 1 Pointer in C 2 types of pointer 3 NULL pointer 4 Dangling Pointer 5 Void/Generic Pointers 6 Wild Pointer 7 Near, Far and Huge Pointer 8 Pointer Expressions and Arithmetic 9 Pointer and Array 10 Strings as pointers 11 Pointer to Function 12 Call by Reference in C

Structure in C Language 1 Structure in C 2 Nested Structure in C 3 Array of Structures in C 4 Pointer to Structure 5 Structure to Function in C 6 typedef in C 7 typedef vs #define in C

Union in C Language 1 Union in C

File Input/Output 1 Introduction to File 2 File Operation in c

Dynamic Memory Allocation 1 Introduction to DMA 2 calloc() and free() 3 realloc() and free() function

C Pre-processor 1 Introduction about Pre-processor

Command Line Arguments 1 Introduction CLAs

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strcpy() Function in C: Copying Strings

Rumman Ansari July 05, 2024 8,223 views

strcpy() Function in C: Copying Strings

strcpy( ) function copies contents of one string into another string. Syntax for strcpy function is given below.

Syntax

char *strcpy(char *str1, const char *str2);

Parameters

The strcpy( ) function copies the contents of str2 into str1. str2 must be a pointer to a null- terminated string. The strcpy( ) function returns a pointer to str1.

In C99, str1 and str2 are qualified by restrict.

If str1 and str2 overlap, the behavior of strcpy( ) is undefined.

Methods	Description
`strcpy ( str1, str2);`	It copies contents of str2 into str1.
strcpy `( str2, str1);`	It copies contents of str1 into str2.

Program

In this program, source string " Welcome" is copied into target string using strcpy( ) function.

#include 
#include 
 
int main( )
{
   char source[ ] = " Welcome" ;
   char target[20]= "to atnyla" ;
   printf ( "\nsource string = %s", source ) ;
   printf ( "\ntarget string = %s", target ) ;
   strcpy ( target, source ) ;
   printf ( "\ntarget string after strcpy( ) = %s", target ) ;
   return 0;
}

Output

source string =  Welcome
target string = to atnyla
target string after strcpy( ) =  Welcome

Points to be Noted

If destination string length is less than source string, entire source string value won’t be copied into destination string.

For example, consider destination string length is 20 and source string length is 30. Then, only 20 characters from source string will be copied into destination string and remaining 10 characters won’t be copied and will be truncated.