public Task <double> GetRespAsync(double x, double y, string op)
{
var calculator = new CalculatorStub.Calculator(x, y, op);
return(Task.FromResult(calculator.Calculate()));
}
public Task <double> GetRespAsync(string x, string y, string op)
{
var calculator = new CalculatorStub.Calculator(double.Parse(x), double.Parse(y), op);
return(Task.FromResult(calculator.Calculate()));
}