Help with C# Calculator

[Clanscorpia]

I've been learning C# and I've tried to make a calculator and here's my code. I'll explain it after.

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace FirstConsoleProgram{    class Program    {        /// <summary>        ///         /// </summary>        /// <param name="args"></param>        static void Main(string[] args)        {                int num01;                int num02;            string Multiply = "multiply";            string Divide = "divide";            string Add = "add";            string Subtract = "subtract";            string userInput;            Console.Write("Write 'multiply' to multiply, 'add' to add, 'subtract' to subtract, or 'divide' to divide");              userInput = Console.ReadLine();            if (userInput = Multiply)            {                Console.Write("Type a number to multiply:  ");                num01 = Convert.ToInt32(Console.ReadLine());                Console.Write("Type another number:   ");                num02 = Convert.ToInt32(Console.ReadLine());                Console.WriteLine("The result is  " + num01 * num02);                    }                          }    }}

I'm trying to make a calculator that when you type in your operation (Add, Subtract, Multiply, Divide), but when I tried to make an IF statement to run a certain set of commands if you type in the operation you desire but I've come up upon a problem. In the IF statement, I get this error (I'm using Visual Studio Community 2015)
Error    CS0029    Cannot implicitly convert type 'string' to 'bool'    I get this on the command if (userInput = Multiply). Anyone that can help?
 

[PampaZiya]

userInput.equals(Multiply)

 

Also, I think swtich case is way better in this case.

switch(userInput){      case "Multiply" : //do stuff             break;      case "divide" : //do stuff             break;      default : //print that the user's input is invalid             break;  etc....}

[PampaZiya]

DUPLICATE 

[Clanscorpia]

Ugh, I'm so dumb, should have noticed that from Arduino

[Clanscorpia]

Got it Works now thanks

[Clanscorpia]

Ack, another error 0.o. This one is with the subtraction part of the calculator. I don't think it wants me to use "-" for subtraction (Without the apostrophes). Here's my line. Any help?

Console.WriteLine("The result is  " + num01 - num02);

Error    CS0019    Operator '-' cannot be applied to operands of type 'string' and 'int'    There's my error. Thanks for the help guys!

[Clanscorpia]

This line also isn't working. There aren't any errors but when I add something they just go together -.- . 7+3 got 73. Any help for this and the last one?

 if (userInput == Add)
            {
                Console.Write("Type a number to add to:  ");
                num01 = Convert.ToInt32(Console.ReadLine());
                Console.Write("Type another number:  ");
                num02 = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("The result is  " + num01 + num02);
                Console.ReadKey();
            }

[PlutoNZL]

Ack, another error 0.o. This one is with the subtraction part of the calculator. I don't think it wants me to use "-" for subtraction (Without the apostrophes). Here's my line. Any help?

Console.WriteLine("The result is  " + num01 - num02);

Error    CS0019    Operator '-' cannot be applied to operands of type 'string' and 'int'    There's my error. Thanks for the help guys!

"The result is  " + num01

produces a string

"The result is  " + num01 - num02

is trying to subtract from a string, which isn't possible. That's what the error is saying.

What you want is:

"The result is  " + (num01 - num02)

Putting the parenthesis forces num01 - num02 to be evaluated before appending the result to the string.

[PlutoNZL]

This line also isn't working. There aren't any errors but when I add something they just go together -.- . 7+3 got 73. Any help for this and the last one?

 if (userInput == Add)

            {

                Console.Write("Type a number to add to:  ");

                num01 = Convert.ToInt32(Console.ReadLine());

                Console.Write("Type another number:  ");

                num02 = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("The result is  " + num01 + num02);

                Console.ReadKey();

            }

This issue is very similar to above.

If num01 = 7 and num02 = 3:

"The result is  " + num01

equals the string "The result is 7"

"The result is 7" + 3

equals the string "The result is 73"

[Clanscorpia]

Figured it out . Thanks though! But how do I put it as a program?

[Jirajha]

Figured it out . Thanks though! But how do I put it as a program?

What do you mean exactly? Do you mean how to build it into a .exe file?

 

You can Build it in the Build menu. Then head over to your project folder and have a look into your binaries folder "/bin/"

[Clanscorpia]

Yeah, but how do I make it so people can download it and use it?

[madknight3]

Yeah, but how do I make it so people can download it and use it?

 

You can create an installer for it. One option is WiX. Another option is ClickOnce. I'm sure there are others out there if those don't meet your needs.

 

Then host the installer somewhere (website, cloud storage, etc) so people can download it.

[Clanscorpia]

Don't I need to put the source files or something or will the .exe be enough?

[Jirajha]

Don't I need to put the source files or something or will the .exe be enough?

 

Since the best way to learn is by trying it:

Copy everything from your program from the bin folder to another one and remove one file after another. If it doesn't start it was probably needed.

 

If you have a Windows based Server somewhere you might want to have a look at WebDeployment.

[Nuluvius]

Copy everything from your program from the bin folder to another one and remove one file after another. If it doesn't start it was probably needed.

 

Sorry but that is just a ridiculous suggestion. Just don't and use WIX instead - it is very simple to put together an installer.

[vorticalbox]

-snip-

 

 

I would have done it like this.

 

 

 

Console.WriteLine("Answer is {0}", num1+num2);