Cautarea unui sir

#include <iostream>
#include <stdio.h>
#include <cstring>

using namespace std;

int main()
{char s1[100],s2[100];

    gets(s1);
    gets(s2);
    if(strstr(s1,s2)!=NULL)
        cout<<"sirul s2 este inclus in sirul s1";
        else
        cout<<"sirul s2 nu este inclus in sirul s1";

    return 0;
}