C语言库strncat()函数

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

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

   strcpy(src,  "This is source");
   strcpy(dest, "This is destination");
   strncat(dest, src, 15);

   printf("Final destination string : |%s|", dest);
   return(0);
}