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### Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today. # C# Basics: Bonus exercises (Calculator)

I am getting a specific error over and over again on a C# Bonus Exercise (Programming a Calculator). I am brand new to the language and would appreciate any help I could get.

The program is intended to take two numbers from a user, an operator, and then combine the numbers with the operator.

```using System;

namespace Treehouse.bonus
{
class Program
{
static void Main()
{
while(true) {

Console.WriteLine("Enter a number: ");

Console.WriteLine("Enter another number: ");

Console.WriteLine("Enter an operator (+, -, *, /, or %): ");

try
{
Double number3 = Double.Parse(number1);

Double number4 = Double.Parse(number2);

if(sign == "+")
{
Console.WriteLine(number1 + " + " + number2 + " = " (number3 + number4));
}

else if(sign == "-")
{
Console.WriteLine(number1 + " - " + number2 + " = " (number3 - number4));
}

else if(sign == "*")
{
Console.WriteLine(number1 + " * " + number2 + " = " (number3 * number4));
}

else if(sign == "/")
{
Console.WriteLine(number1 + " / " + number2 + " = " (number3 / number4));
}

else
{
Console.WriteLine("The operator you selected isn't valid... Please try again.");
continue;
}

}

catch(FormatException)

{
Console.WriteLine("One or more of numbers you inputed is invalid. Please try again.");
continue;
}
}
}

}
}
```

The error message I am getting is this:

quiz.cs(31,59): error CS0119: Expression denotes a `value', where a`method group' was expected
quiz.cs(36,59): error CS0119: Expression denotes a `value', where a`method group' was expected
quiz.cs(41,59): error CS0119: Expression denotes a `value', where a`method group' was expected
quiz.cs(46,59): error CS0119: Expression denotes a `value', where a`method group' was expected

... in regards to the else/if operator lines of code. If I simply use an '=' as opposed to '==', I get a different set of errors... What am I missing?

Well, you seem to be missing concatenation operator before printing the result. For instance,

```Console.WriteLine(number1 + " + " + number2 + " = " (number3 + number4));
```

in the above statement, after " = ", you can drop in a '+' so that string concatenation can happen. So, it should be as below:

```Console.WriteLine(number1 + " + " + number2 + " = " + (number3 + number4));
```

You may do this for the lines where errors are reported (i.e. 31, 36, 41, 46). Thank you so much for answering both my questions, Srikar. I am just learning to program and sometimes it is really hard to catch simple mistakes without another set of eyes. You just made my night!!!

You are welcome, John: