whether s2 contains s1

#include <iostream>
#include <cstdlib>
#include <time.h>
#include <math.h>
#include <string>

using namespace std;
string s1,s2;
void comparsion(string,string);
int counter=0;
int roz=0;
int where=0;

int main(){
srand(time(0));

getline(cin,s1);
getline(cin,s2);

comparsion(s1,s2);


return 0;
}

void comparsion(string s1,string s2)
{
    roz=s2.size();
for(int i=0;i<=roz;i++)
if(s2.find(s1,(where+i))!=string::npos)
{
    counter++;
    where=s2.find(s1,(where+i));
}
cout<<"Pierwszy wyraz zawiera sie w drugim "<<counter<<" razy";
 }