public IActionResult Calculator()
        {
            var calc = new CalculatorVals()
            {
                FirstValue  = 0,
                SecondValue = 0,
                Answer      = 0,
                Operator    = "+"
            };

            return(View(calc));
        }
 public IActionResult Calculator(CalculatorVals vals)
 {
     if (vals.Operator == "+")
     {
         vals.Answer = vals.FirstValue + vals.SecondValue;
     }
     else if (vals.Operator == "-")
     {
         vals.Answer = vals.FirstValue - vals.SecondValue;
     }
     else if (vals.Operator == "/")
     {
         vals.Answer = vals.FirstValue / vals.SecondValue;
     }
     else
     {
         vals.Answer = vals.FirstValue * vals.SecondValue;
     }
     return(View(vals));
 }