Make a float only show two decimal places

Question

I have the value 25 00 in a float  but when I print it on screen it is 25 0000000  How can I display the value with only two decimal places

User · Answer

I made a swift extension based on above answers

extension Float {
    func round(decimalPlace:Int)->Float{
        let format = NSString(format: "%%.%if", decimalPlace)
        let string = NSString(format: format, self)
        return Float(atof(string.UTF8String))
    }
}

usage:

let floatOne:Float = 3.1415926
let floatTwo:Float = 3.1425934
print(floatOne.round(2) == floatTwo.round(2))
// should be true

User · Answer

If you need to float value as well   NSString  formattedNumber    NSString stringWithFormat     02f   myFloat   float floatTwoDecimalDigits   atof  formattedNumber UTF8String

User · Answer

In Swift Language  if you want to show you need to use it in this way  To assign double value in UITextView  for example   let result   23 954893 resultTextView text   NSString format    2f   result    If you want to show in LOG like as objective-c does using NSLog    then in Swift Language you can do this way   println NSString format    2f   result

User · Answer

IN objective-c  if you are dealing with regular char arrays  instead of pointers to NSString  you could also use   printf    02f   your float var     OTOH  if what you want is to store that value on a char array you could use   sprintf your char ptr     02f   your float var

User · Answer

Another method for Swift  without using NSString    let percentage   33 3333 let text   String localizedStringWithFormat    02f      percentage         P S  this solution is not working with CGFloat type only tested with Float  amp  Double

User · Answer

Here are few corrections-    for 3145 559706     Swift 3  let num  CGFloat   3145 559706 print String format    f   num     3145 559706 print String format     f   num     3145 print String format     1f   num     3145 6 print String format     2f   num     3145 56 print String format     02f   num     3145 56    which is equal to     2f  print String format     3f   num     3145 560 print String format     03f   num     3145 560    which is equal to     3f      Obj-C     f       3145 559706     f      3146     1f     3145 6     2f     3145 56     02f    3145 56    which is equal to     2f      3f     3145 560     03f    3145 560    which is equal to     3f    and so on

User · Answer

in objective -c is u want to display float value in 2 decimal number then pass argument indicating how many decimal points u want to display e g 0 02f will print 25 00     0 002f will print 25 000

User · Answer

The problem with all the answers is that multiplying and then dividing results in precision issues because you used division   I learned this long ago from programming on a PDP8  The way to resolve this is   return roundf number   100     01    Thus 15 6578 returns just 15 66 and not 15 6578999 or something unintended like that   What level of precision you want is up to you   Just don t divide the product  multiply it by the decimal equivalent  No funny String conversion required

User · Answer

Use NSNumberFormatter with maximumFractionDigits as below   NSNumberFormatter  formatter     NSNumberFormatter alloc  init   formatter maximumFractionDigits   2  NSLog         formatter stringFromNumber  NSNumber numberWithFloat 12 345       And you will get 12 35

User · Answer

It is not a matter of how the number is stored  it is a matter of how you are displaying it  When converting it to a string you must round to the desired precision  which in your case is two decimal places   E g    NSString  formattedNumber    NSString stringWithFormat     02f   myFloat       02f tells the formatter that you will be formatting a float   f  and  that should be rounded to two places  and should be padded with 0s   E g     f   25 000000   f   25   02f   25 00

User · Answer

You can also try using NSNumberFormatter   NSNumberFormatter  nf      NSNumberFormatter alloc  init  autorelease   nf positiveFormat     0      NSString  s    nf stringFromNumber   NSNumber numberWithFloat  myFloat      You may need to also set the negative format  but I think it s smart enough to figure it out

User · Answer

Here s some methods to format dynamically according to a precision      NSNumber   numberFromString  NSString   string       if  string length            NSNumberFormatter   f     NSNumberFormatter alloc  init           f numberStyle   NSNumberFormatterDecimalStyle          return  f numberFromString string         else           return nil              NSString   stringByFormattingString  NSString   string toPrecision  NSInteger precision       NSNumber  numberValue    self numberFromString string        if  numberValue            NSString  formatString    NSString stringWithFormat       ldf    long precision           return  NSString stringWithFormat formatString  numberValue floatValue         else              return original string            return string            e g     TSPAppDelegate stringByFormattingString   2 346324  toPrecision 4        2 3453   TSPAppDelegate stringByFormattingString   2 346324  toPrecision 0        2   TSPAppDelegate stringByFormattingString   2 346324  toPrecision 2        2 35  round up

User · Answer

lblMeter text  NSString stringWithFormat     02f    dic objectForKey   distance   floatValue

[objective-c] Make a float only show two decimal places

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