Program That Reads in Two Numbers and Adds Them Together

#include <iostream>
#include <string>
using namespace std;

int main() {

    int firstnum, secondnum, result;

    cout << "Please enter your first number: ";
    cin >> firstnum;
    cout << "Please enter your second number: ";
    cin >> secondnum;
    result = firstnum + secondnum;
    cout << firstnum << " + " << secondnum << " = " << result << endl;
}

Result:
Please enter your first number: 10
Please enter your second number: 15
10 + 15 = 25