代码
#include <stdio.h>
int main()
{
char s1[80],s2[40];
int i=0,j=0;
scanf("%s",s1);
scanf("%s",s2);
while(s1[i]!='\0')
i++;
while(s2[j]!='\0')
s1[i++]=s2[j++];
s1[i]='\0';
printf("%s\n",s1);
return 0;
}