#include <stdio.h>
#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
float a,b;
float hodnota;
char z;
cout << "Zadej vyraz:";
cin >> a >> z >> b;
while (a!=0 || b!=0) {
switch (z) {
    case '+': hodnota = a + b; break;
    case '*': hodnota = a * b; break;
    case '/': hodnota = a / b; break;
    case '-': hodnota = a - b; break;
    default : hodnota = 0;
    
}
cout << "Vysledkem je:" << hodnota<< endl << "---------------- " << endl;
cout << "Zadej vyraz:";
cin >> a >> z >> b;
}
    
}