Reexel

Как назвали?

#include <iostream>
using namespace std;

int main()
{	


    double a, b, sum, raz, umn, del;

	cout << "vvedite dannie \n";
    cin >> a;
	cin >> b;

    sum = a + b;
    raz = a - b;
    umn = a*b;
    del = a / b;

    
    if (a + b)
        cout << sum << "\n";
    else
    if (a - b)
        cout << raz << "\n";
    else
    if (a*b)
        cout << umn << "\n";
    else
    if (a / b)
        cout << del << "\n";
    else
        cout << "hernyu ne nesi, dyatel. \n";
    system("pause");
    return 0;

        
}</iostream>

как вариант