CODEWITHSUNDEEP
iphoneobjective-ccocoa-touch
copenndthagen
copenndthagen

Reputation: 50732

Round double value to 2 decimal places

I have a double value as 22.368511 I want to round it to 2 decimal places. i.e. it should return 22.37

How can I do that?

Upvotes: 89

Views: 114979

Answers (12)

Matias Masso
Matias Masso

Reputation: 1980

I use the solution posted by Umberto Raimondi extending type Double:

extension Double {
    func roundTo(places:Int) -> Double {
        let divisor = pow(10.0, Double(places))
        return (self * divisor).rounded() / divisor
    }
}

Upvotes: 2

Saikiran Komirishetty
Saikiran Komirishetty

Reputation: 6565

You can use the below code to format it to two decimal places

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];

[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setMaximumFractionDigits:2];
[formatter setRoundingMode: NSNumberFormatterRoundUp];

NSString *numberString = [formatter stringFromNumber:[NSNumber numberWithFloat:22.368511]];

NSLog(@"Result...%@",numberString);//Result 22.37

Swift 4:

let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.maximumFractionDigits = 2
formatter.roundingMode = .up

let str = String(describing: formatter.string(from: 12.2345)!)

print(str)

Upvotes: 73

Fruity Geek
Fruity Geek

Reputation: 7381

You can use the NSDecimalRound function

Upvotes: 11

Jason Rogers
Jason Rogers

Reputation: 19344

As in most languages the format is 

%.2f

you can see more examples here

Edit: I also got this if your concerned about the display of the point in cases of 25.00

{
    NSNumberFormatter *fmt = [[NSNumberFormatter alloc] init];
    [fmt setPositiveFormat:@"0.##"];
    NSLog(@"%@", [fmt stringFromNumber:[NSNumber numberWithFloat:25.342]]);
    NSLog(@"%@", [fmt stringFromNumber:[NSNumber numberWithFloat:25.3]]);
    NSLog(@"%@", [fmt stringFromNumber:[NSNumber numberWithFloat:25.0]]);
}

2010-08-22 15:04:10.614 a.out[6954:903] 25.34
2010-08-22 15:04:10.616 a.out[6954:903] 25.3
2010-08-22 15:04:10.617 a.out[6954:903] 25

Upvotes: 191

Paula Hasstenteufel
Paula Hasstenteufel

Reputation: 720

For Swift there is a simple solution if you can't either import Foundation, use round() and/or does not want a String (usually the case when you're in Playground):

var number = 31.726354765
var intNumber = Int(number * 1000.0)
var roundedNumber = Double(intNumber) / 1000.0

result: 31.726

Upvotes: 2

Radu Ursache
Radu Ursache

Reputation: 1482

To remove the decimals from your double, take a look at this output

Obj C

double hellodouble = 10.025;
NSLog(@"Your value with 2 decimals: %.2f", hellodouble);
NSLog(@"Your value with no decimals: %.0f", hellodouble);

The output will be:

10.02 
10

Swift 2.1 and Xcode 7.2.1

let hellodouble:Double = 3.14159265358979
print(String(format:"Your value with 2 decimals: %.2f", hellodouble))
print(String(format:"Your value with no decimals: %.0f", hellodouble))

The output will be:

3.14 
3

Upvotes: 6

Hoang Minh
Hoang Minh

Reputation: 1220

You could do this:

NSNumberFormatter* f = [[NSNumberFormatter alloc] init];
[f setNumberStyle:NSNumberFormatterDecimalStyle];
[f setFormat:@0.00"];

// test
NSNumber* a = @12;
NSString* s = [f stringFromNumber:a];
NSLog(@"%@", s);

Upvotes: 0

1156752
1156752

Reputation: 4013

In Swift 2.0 and Xcode 7.2:

let pi:Double = 3.14159265358979
String(format:"%.2f", pi)

Example:

enter image description here

Upvotes: 11

Coder_A_D
Coder_A_D

Reputation: 340

Use NSNumber *aNumber = [NSNumber numberWithDouble:number]; instead of NSNumber *aNumber = [NSNumber numberWithFloat:number];

+(NSString *)roundToNearestValue:(double)number
{
    NSNumber *aNumber = [NSNumber numberWithDouble:number];

    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    [numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
    [numberFormatter setUsesGroupingSeparator:NO];
    [numberFormatter setMaximumFractionDigits:2];
    [numberFormatter setMinimumFractionDigits:0];
    NSString *string = [numberFormatter stringFromNumber:aNumber];        
    return string;
}

Upvotes: 2

TigerCoding
TigerCoding

Reputation: 8720

[label setText:@"Value: %.2f", myNumber];

Upvotes: 15

krafter
krafter

Reputation: 1432

 value = (round(value*100)) / 100.0;

Upvotes: 30

Kit Ramos
Kit Ramos

Reputation: 1859

I was going to go with Jason's answer but I noticed that in My version of Xcode (4.3.3) I couldn't do that. so after a bit of research I found they had recently changed the class methods and removed all the old ones. so here's how I had to do it:

NSNumberFormatter *fmt = [[NSNumberFormatter alloc] init];

[fmt setMaximumFractionDigits:2];
NSLog(@"%@", [fmt stringFromNumber:[NSNumber numberWithFloat:25.342]]);

Upvotes: 4

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