03. Sum Prime Non Prime

#include <iostream>
#include <string>

using namespace std;

int main() {

    int prime = 0, nonPrime = 0;

    string command;
    cin >> command;

    while (command != "stop") {

        int number = stoi(command);

        if (number >= 0) {

            if (number % 2 == 0 || number % 3 == 0 || number % 5 == 0) {
                if (number == 2 || number == 3 || number == 5 || number == 7) {
                    prime += number;
                }
                else {
                    nonPrime += number;
                }
            }
            else {
                prime += number;
            }
        }
        else {
            cout << "Number is negative.\n";
        }
        cin >> command;
    }

    cout << "Sum of all prime numbers is: " << prime << endl;
    cout << "Sum of all non prime numbers is: " << nonPrime << endl;

    return 0;
}