#include <iostream>

using namespace std;

int main()
{
    float a, b;
    int d, e;
    char c;
    while(1)
    {
        cout<<"Viberite kod simvola:\n1.Calc\n2.Vihod\n";
        cin>>e;
        d=1;
        while(d==1)
            switch(e)
            {
                case 1:d=0;break;
                case 2:return 0;
                default: cout<<"Nepravil'niy simvol... Povtorite vvod...\n";
            }
        cout << "Vvedite 2 chisla" << endl;
        cin>>a>>b;
        cout<<"Viberite 1 iz 4 operaciy...\n1.+\n2.-\n3.*\n4./\n";
        cin>>c;
        while(d==0)
        {
            d=1;
            switch(c)
            {
                case '+': cout<<a+b; break;
                case '-': cout<<a-b; break;
                case '*': cout<<a*b; break;
                case '/': if(b!=0) cout<<a/b; else cout<<"Delenie na 0 nevozmozhno"; break;
                default: d=0;cout<<"Nepravil'niy simvol... Povtorite vvod...";
            }
            cout<<endl;
        }
    }
    return 0;
}