basic question help

Question

//here i have not include string library and in compilation it does not giving error but length is defined in string library
#include <iostream>
using namespace std;

int main() {
int n;
string s="fsdfsf";
n=s.length();
cout<<n;
return 0;
}

Answer 1

Bahubali generally iostream header inclusion assures string inclusion.... Iostream has already included string within itself..but different compiler version may have different behaviour...even though it is provided in iostream, for safety and improved code speed, it's recommended to include individual string header if you are going to use string functions..

Answer 2

thank u