#include <iostream>
using namespace std;
int main ()
{

	double a, b;
	char r ;
    const unsigned char UE = static_cast<unsigned char>(154);
	cout << "Bitte geben sie die Rechnung ein (nur +,-,*,/)" << endl;
	cout << "Beenden Sie, indem Sie an beide Zahlen 0 " << UE << "bergeben" << endl;
	while( a and b != '0')
	cin >> a >> r >> b ;
    cout << endl;
    if (a and b == '1' or '2' or '3' or '4' or '5' or '6' or '7' or '8' or '9' or '0');
    else return 0;
    	if('+'==r)
	{
		cout << a+b << endl;
	}
	else if('-'==r)
	{
		cout << a-b << endl;
	}
	else if('*'==r)
	{
		cout << a*b << endl;
	}
	else if('/'==r)
	{
		cout << a/b << endl;
	}
	else return 0;
}
	return 0 ;  
}