operations 20.09.19

#include <iostream>

using namespace std;

int main()
{


    int num_one = 0;
    int num_two = 0;
    char sign;
    double sum;
    bool flag = true;

    cin>>num_one>>num_two;


    while(flag)
    {
        cin>>sign;
        switch(sign)
        {
        case '+':
            sum = num_one + num_two;
            cout << sum << endl;
            flag = false;
            break;

        case '-':
            sum = num_one - num_two;
            cout << sum << endl;
            flag = false;
            break;

        case '*':
            sum = num_one * num_two;
            cout << sum << endl;
            flag = false;
            break;

        case '/':
            if(num_two == 0){
            cout<<"try again"<<endl;
            break;
            }
            sum = num_one / num_two;
            cout << sum << endl;
            flag = false;
            break;
        default:
            cout<<"try again"<<endl;
            break;
        }
    }





    return 0;
}