C Tutorial/string.h/strcat

strcat

Item Value Header file string.h Declaration char *strcat(char *str1, const char *str2); Function concatenates a copy of *str2 to *str1 and terminates *str1 with a null. Return returns *str1.

You have to ensure that str1 is large enough to hold both its original contents and those of str2.

<source lang="cpp">#include <stdio.h>

 #include <string.h>
 int main(void)
 {
   char s1[80], s2[80];
   printf("s1:");
   gets(s1);
   printf("s2:");
   gets(s2);
   strcat(s2, s1);
   printf(s2);
   return 0;
 }</source>