substr (pos,length)
#include <string.h>
#include <iostream>
using namespace std;
int main(){
// Take any string
string s1 = "Geeks";
// Copy three characters of s1 (starting
// from position 1)
string r = s1.substr(1, 3);
// prints the result
cout << "String is: " << r; //String is: eek
return 0;
}