How to round off Float values?

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Rounding numbers in Objective-C

In Objective-c How to round off Float values?

score 151 · Accepted Answer · edited Nov 06 '15 at 13:23

151

In addition to the other answers:

float theFloat = 1.23456;
int rounded = roundf(theFloat); NSLog(@"%d",rounded);
int roundedUp = ceil(theFloat); NSLog(@"%d",roundedUp);
int roundedDown = floor(theFloat); NSLog(@"%d",roundedDown);
// Note: int can be replaced by float

For rounding to specific decimals, see the question mentioned by Alex Kazaev.

edited Nov 06 '15 at 13:23

mattsven

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answered Apr 08 '11 at 11:07

Anne

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You should use `roundf` instead of `lroundf` for casting to `int` without warning. I could not edit your post because of the minimum character change limit for edit. – ersentekin Apr 09 '15 at 13:00

score 18 · Answer 2 · edited Aug 12 '12 at 13:30

18

The function lroundf() will do it:

float a=20.49;
int myInt = lroundf(a);

edited Aug 12 '12 at 13:30

Monolo

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answered Apr 08 '11 at 11:01

Rakesh Bhatt

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what if the value of a is more than 20.5 ? – ios Apr 08 '11 at 11:43
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no. lroundf(a) gives u like if value is 20.75 then it become 21 and if value is 20.45 then it become 20... means more than 20.5 then it will become 21 else 20. :) – Rakesh Bhatt Apr 08 '11 at 12:17

Dan Hanly · Answer 3 · 2012-12-24T12:51:09.290

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Convert to int and then convert back to float.

CGFloat *myFloat = 100.765;
NSInteger *myInteger = myFloat;
CGFloat *newFloat = myInteger;

This will work

edited Dec 24 '12 at 12:51

answered Apr 08 '11 at 11:02

Dan Hanly

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That's truncation (floor/ceil) not rounding. – xaphod Jun 14 '15 at 22:48

How to round off Float values?

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