Account Balance

#include <iostream>
#include <string>

using namespace std;

int main() {
    string input;
    cin >> input;

    double total = 0;

    while (input != "NoMoreMoney") {
        double cash = stod(input);

        if (cash < 0) {
            cout << "Invalid operation!\n";
            break;
        }

        printf("Increase: %.2f\n", cash);
        total += cash;

        cin >> input;
    }

    printf("Total: %.2f\n", total);

    return 0;
}