How to round to a specific decimal accuracy?

Question

Possible Duplicate:
Round a double to 2 significant figures after decimal point

I have a value var i = 0.69999980926513672. I need to round this value to 0.7 is there a built-in method that will do this?

score 13 · Answer 1 · edited May 23 '17 at 11:55

13

Use one of:

System.Math.Round (i, 1, MidpointRounding.ToEven);
System.Math.Round (i, 1, MidpointRounding.AwayFromZero);

The difference is how it handles numbers that are equidistant to the rounding point (e.g., 0.65 in your case could either go to 0.7 or 0.6).

Here is a answer I gave to another question which holds much more information.

edited May 23 '17 at 11:55

Community

answered Sep 08 '09 at 06:42

paxdiablo

1

Leveraging your rich portfolio of answers +1 – Eric Schoonover Sep 08 '09 at 06:50
As my wife says when I'm in full flight, conversationally speaking, the less people are forced to listen to me, the happier they seem to become :-) So it's probably best to keep the answers short and reference my more voluminous essays with links. – paxdiablo Sep 08 '09 at 06:59

score 3 · Accepted Answer · answered Sep 08 '09 at 06:42

3

You are looking for the Math.Round method.

//first param is number to round
//second param is the accuracy to use in the rounding (number of decimal places)
Math.Round(i, 2)

answered Sep 08 '09 at 06:42

Eric Schoonover

score 3 · Answer 3 · answered Sep 08 '09 at 06:43

3

Console.WriteLine(System.Math.Round(0.69999980926513672d, 1));

-- edit

wow, you blink and there are 5 other answers!

answered Sep 08 '09 at 06:43

Noon Silk

This is one of the most commonly asked "math" questions on Stack Overflow. – Greg Hewgill Sep 08 '09 at 06:48

score 2 · Answer 4 · answered Sep 08 '09 at 06:41

2

answered Sep 08 '09 at 06:41

x2.

score 1 · Answer 5 · answered Sep 08 '09 at 06:42

1

Use the Math.Round method:

double i = 0.69999980926513672;
double result = Math.Round(i, 2);

answered Sep 08 '09 at 06:42

Ahmad Mageed

5 Answers5