5/6課輔-字串連續搜尋

//字串連續搜尋
#include <iostream>
#include <iostream>
using namespace std;

int main()
{
    string s1="this is s1, and next is s2. we are strings.",s2="is";
    int target=s1.find(s2,0);
    int counter=0;
    while(target!=string::npos)
    {
        counter++;
        cout<<"found at "<<target<<endl;
        target=s1.find(s2,target+1);
    }
    return 0;
}