Why is my command to convert positive to negative not working

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So if for example i enter 20 and execute the command instead of making it -20 it makes it 20-, why??

What I have tried:

textBox1.Text = (Double.Parse(textBox1.Text) * -1).ToString();

Posted 28-Jul-18 23:11pm

NotAComputerScienceStudent

Updated 29-Jul-18 13:42pm

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Kornfeld Eliyahu Peter 29-Jul-18 5:12am

It probably around displaying RTL and LTR... nothing wrong with the value...

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Richard MacCutchan · Answer 1 · 2018-07-28T23:19:00

Solution 1

I just tried your code and it works fine. There must be something else in your program that is affecting your results. Or it may be that the regional settings on your system use a trailing minus sign for negative numbers.

Posted 28-Jul-18 23:19pm

Richard MacCutchan

George Swan · Answer 2 · 2018-07-29T13:43:00

It looks like System.Globalization.NumberStyles is set to AllowTrailingSign. You can change your double.Parse method to place the sign in front of the number like this.

C#

 string res=String.Format("{0:#.##;-#.##}", (Double.Parse("200.549") * -1));
//'-200.55'

The first 3 '#'symbols format a positive number. No '+' sign rounded to 2 decimal places. The second set of 3 '#'symbols format a negative number. A '-' sign followed by the number rounded to 2 decimal places.

Why is my command to convert positive to negative not working

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Why is my command to convert positive to negative not working

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