#include <cstdlib>
#include <iostream>
#include <sstream>
usingnamespace std;
int main() {
// Using atoi
int i = atoi("123");
cout << "i == " << i << endl; // prints "i == 123"
// Using stringstream
stringstream ss("10 20 30");
int a, b, c;
ss >> a >> b >> c;
cout << "a, b, c == " << a << ", " << b << ", " << c << endl; // prints "a, b, c == 10, 20, 30"
}