Using strcat and strncat : strncat « string.h « C Tutorial

1. C Tutorial
2. string.h
3. strncat

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

int main()
{ 
   char s1[ 20 ] = "Happy "; 
   char s2[] = "New Year ";  
   char s3[ 40 ] = "";       
   
   printf( "s1 = %s\ns2 = %s\n", s1, s2 );

   printf( "strcat( s1, s2 ) = %s\n", strcat( s1, s2 ) );

   printf( "strncat( s3, s1, 6 ) = %s\n", strncat( s3, s1, 6 ) );

   printf( "strcat( s3, s1 ) = %s\n", strcat( s3, s1 ) );

   return 0;

}

s1 = Happy
s2 = New Year
strcat( s1, s2 ) = Happy New Year
strncat( s3, s1, 6 ) = Happy
strcat( s3, s1 ) = Happy Happy New Year