static void Main(string[] args)
{
double a = EnterNumber1();
char operation = EnterOperator();
double b = EnterNumber2();
Calculation c = new Calculation();
switch (operation)
{
case '+':
PrintResult(c.Sum(a, b).ToString());
break;
case '-':
PrintResult(c.Diff(a, b).ToString());
break;
case '*':
PrintResult(c.Multiply(a, b).ToString());
break;
case '/':
PrintResult(c.Division(a, b).ToString());
break;
case '%':
PrintResult(c.RemainderOfDivision(a, b).ToString());
break;
}
Console.ReadLine();
}