C/string.h/strcat

    
 
//Declaration:  char *strcat(char *str1, const char *str2); 
//Return:       returns *str1. 
  #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;
  }
         
/*
s1:s
s2:2
2s*/