Coding with Modulus in C#

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Hello all. I am currently in a Fundamental Programming and Logic class. My project is creating a simple calculator. I have everything written except for the modulus button. I have searched the web trying to find how to code this but am unable to find exactly what I am needing. I understand that modulus finds the remainder between two numbers. What I am trying to do is take the first number entered into the txtbox, hit the modulus button then enter the second number and hit equal. I am lost on how to code this. Please teach me something, oh gurus of code. I'm 99% done with this project.

Thank you all, ahead of time, for taking time to answer.

Posted 5-Mar-13 8:44am

tbonvillain

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Richard C Bishop 5-Mar-13 14:52pm

Just extract the users input and use the modulus operator.

Convert.ToInt32(txtbox1.Text) % Convert.ToInt32(txtbox2.Text)

tbonvillain 5-Mar-13 15:09pm

Is this if I'm using two text boxes? I'm only using one text box for the project.

Richard C Bishop 5-Mar-13 15:12pm

Ok, so just use the Split() method that reurns a string array and check for the modulus symbol. If it is present then perform the calculation on the two numbers that were entered. You will be using the string array to get your values for that.

tbonvillain 5-Mar-13 15:13pm

Thank you. I'll give it a shot.

Richard C Bishop 5-Mar-13 15:30pm

Check my solution, it works.

tbonvillain 5-Mar-13 15:30pm

Ok. I didn't use the split method but after looking at your first suggestion, it got me thinking. Under the code for my equals button I added an 'else..if'.

else if (sign == "%")
{
result = val1 % val2;
txtbox.Text = result.ToString();
}

Then under my modulus button I put:

{
sign = "%";

val1 = double.Parse(txtbox.Text);

txtbox.Text = "";

I've tested it several times and it seems to be working. It seems to work also with negative numbers correctly. Tell me what you think.

Thank you for the brain storm.

[no name] 5-Mar-13 15:05pm

Okay so show us what it is that you have tried so far.

tbonvillain 5-Mar-13 15:34pm

Hello Phantom. Please look at the above response and you'll see what I ended up with if you want to take a second look for me. Thank you.

Mike Meinz 5-Mar-13 15:09pm

Really!
You searched the web and couldn't find an answer.

I went to the MSDN web site and entered Modulus in the search text box and the first search result was Modulus Operator (%) documentation and there is some sample code there.

var myMoney : int = 128;
var cookiePrice : int = 33;
// Calculate the change if the maximum number of cookies are bought.
var change : int = myMoney % cookiePrice;
// Calculate number of cookies bought.
var numCookies : int = Math.round((myMoney-change)/cookiePrice);

If you want to be a software developer, you really need to work on those research skills.

Result = LastValueEntered % Convert.ToInt32(txtbox1.text)

tbonvillain 5-Mar-13 15:12pm

I stated that I couldn't find exactly what I needed. Yes, I've been to the MSDN web site plenty of times and have it bookmarked. It gives vague examples but not exactly what I am looking for.

tbonvillain 5-Mar-13 15:33pm

Please try to be polite when answering people. I find it very rude with your response. Thank you for attempting force the information into my head the way you think it needs to be put there. Have a nice day.

Andreas Gieriet 5-Mar-13 16:28pm

Take it easy. But you have to face reality: you never find *exactly* what you need, so, he says you have to improve your researching skills.
You are right that this particular task is already done tousands of time, but each in it's own way. So if you want to benefit of these, you must be able to extract what you need from them yourself.

I wonder about your statement that you have done most of the work of the calculator but struggle with the modulus. So what is so different on modulus compared to the other operators like +, -, *, /? Where do your val1 and val2 come from?

Don't take it as rude answer but rather as advise.

Cheers
Andi

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Richard C Bishop · Accepted Answer · 2013-03-05T09:30:00

Here is a working example of what you need:

string[] s = TextBox1.Text.ToString().Split('%');
       int n = 0;
       if (TextBox1.Text.ToString().Contains("%"))
       {

           n = Convert.ToInt32(s[0].ToString()) % Convert.ToInt32(s[1].ToString());
       }
       Label1.Text = n.ToString();