double variable value print without rounding

Question

2.00/5 (1 vote)

See more:

C#

WinForms

hi double d = 123.45;
math.round(d,0).tostring();
but it print 124
i want to print only 123 not 124
plz help.

Posted 3-Sep-14 5:29am

cadsolution

Add a Solution

Comments

ZurdoDev 3-Sep-14 11:31am

When I run that code it prints 123.

Sergey Alexandrovich Kryukov 3-Sep-14 12:07pm

Of course. :-)
—SA

2 solutions

Solution 4

You can use Math.Truncate()

C#

double d = 123.45;
var output = Math.Truncate(d).ToString();

More at: http://msdn.microsoft.com/en-us/library/c2eabd70(v=vs.110).aspx[^]

Posted 3-Sep-14 6:07am

Dukhabandhu Sahoo

Comments

Sergey Alexandrovich Kryukov 3-Sep-14 12:09pm

No! Another wrong answer! Can you pay at least some attention?
1) Round does provide correct answer; why would you trust OP on that?! 2) Round is not needed.
When rounded is needed, truncate is totally wrong.
—SA

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2014-09-03T06:04:00

You are badly mistaken: rounding really gives you 123, not 124. Your observation was wrong.

More importantly: you should understand that you should not do rounding directly in this and most other cases. This has some danger of using rounded value as some intermediate result and loosing precision. Instead, prefer using rounding embedded in formatting operation:

C#

string myOnScreenValue = string.Format("{0:###}", d); // 3 positions
string myOtherOnScreenValue = string.Format("{0:F0}", d); // better: 0 digits in fractional part

Please see:
http://msdn.microsoft.com/en-us/library/kfsatb94%28v=vs.110%29.aspx[^],
http://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx[^],
http://msdn.microsoft.com/en-us/library/0c899ak8(v=vs.110).aspx[^].

—SA