06. Operations Between Numbers

Решение с тернарен оператор:

#include <iostream>

using namespace std;

int main() {
    int firstNumber, secondNumber;
    cin >> firstNumber >> secondNumber;

    char mathOperator;
    cin >> mathOperator;

    string evenOrOdd;

    double result;

    if (mathOperator == '+' || mathOperator == '-' || mathOperator == '*') {
        result =
            mathOperator == '+' ? firstNumber + secondNumber :
            mathOperator == '-' ? firstNumber - secondNumber : firstNumber * secondNumber;

        cout << firstNumber << ' ' << mathOperator << ' ' << secondNumber << " = " << result << " - " << (result % 2 == 0 ? "even" : "odd") << endl;
    }
    else {
        if (secondNumber == 0) {
            cout << "Cannot divide " << firstNumber << " by zero" << endl;
        }
        else {
            if (mathOperator == '/') {
                result = firstNumber * 1.0 / secondNumber;

                cout.setf(ios::fixed);
                cout.precision(2);
            }
            else {
                result = firstNumber % secondNumber;
            }

            cout << firstNumber << ' ' << mathOperator << ' ' << secondNumber << " = " << result << endl;
        }
    }

    return 0;
}