文件目录

#include <iostream>
using namespace std;

int main()
{
    double a, b;
    char c;
    cin >> a >> b >> c;
    if (b == 0 && c == '/')
    {
        cout << "Divided by zero!";
        return 0;
    }
    switch (c)
    {
    case '+':
        cout << a + b;
        break;
    case '-':
        cout << a - b;
        break;
    case '*':
        cout << a * b;
        break;
    case '/':
        cout << a / b;
        break;
    default:
        cout << "Invalid operator!";
    }
    return 0;
}