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Strcat

Item Value Header filestring.h Declarationchar *strcat(char *str1, const char *str2); Functionconcatenates a copy of *str2 to *str1 and terminates *str1 with a null. Returnreturns *str1. You have to ensure that str1 is large enough to hold both its original contents and those of str2. #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