C library function - strcat()


The C library function char *strcat(char *dest, const char *src) appends the string pointed to by src to the end of the string pointed to by dest.


Following is the declaration for strcat() function.

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


  • dest − This is 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

This function returns a pointer to the resulting string dest.


The following example shows the usage of strcat() function.

#include <stdio.h>
#include <string.h>

int main () {
   char src[50], dest[50];

   strcpy(src,  "This is source");
   strcpy(dest, "This is destination");

   strcat(dest, src);

   printf("Final destination string : |%s|", dest);

Let us compile and run the above program that will produce the following result −

Final destination string : |This is destinationThis is source|