strcat() in C

Last Updated : 11 Mar, 2023

C strcat() function appends the string pointed to by src to the end of the string pointed to by dest. It will append a copy of the source string in the destination string. plus a terminating Null character. The initial character of the string(src) overwrites the Null-character present at the end of the string(dest).

It is a predefined string handling function under string library <string.h> in c and <cstring> in C++.

Syntax:

char *strcat(char *dest, const char *src);

Parameters: The method accepts the following parameters:

dest: This is a pointer to the destination array, which should contain a C string, and should be large enough to contain the concatenated resulting string.
src: This is the string to be appended. This should not overlap the destination.

Return value:

The strcat() function returns dest, the pointer to the destination string.

String Concatenate

Examples:

Input: src = "ForGeeks"
       dest = "Geeks"
Output: "GeeksForGeeks"

Input: src = "World"
       dest = "Hello "
Output: "Hello World"

Below is the C/C++ program to implement the above approach:

C

// C program to implement 
// the above approach 
#include <stdio.h> 
#include <string.h> 
  
// Driver code 
int main() 
{ 
    // Define a temporary variable 
    char example[100]; 
  
    // Copy the first string into 
    // the variable 
    strcpy(example, "Geeks"); 
  
    // Concatenate this string 
    // to the end of the first one 
    strcat(example, "ForGeeks"); 
  
    // Display the concatenated strings 
    printf("%s\n", example); 
  
    return 0; 
}

Output

GeeksForGeeks

The behavior of strcat() is undefined if:

the destination array is not large enough for the contents of both src and dest and the terminating null character
if the string overlaps.
if either dest or src is not a pointer to a null-terminated byte string.

strcspn() in C

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