Converting a string to a number

• Joe Lertola Converting a string to a number Mar 24 2004, 00:10
  If I have a NSString that contains a number how can I convert it into a
  real number. For example if I have a NSString = "123.456 is my number",
  how can I get the value 123.456 into a float?
  
  Thanks,
  
  -Joe Lertola
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• Nick Zitzmann Re: Converting a string to a number Mar 24 2004, 01:09
  On Mar 23, 2004, at 4:10 PM, Joe Lertola wrote:
  
  

  > If I have a NSString that contains a number how can I convert it into
  > a real number. For example if I have a NSString = "123.456 is my
  > number", how can I get the value 123.456 into a float?
  

  
  No offense, but I must call "RTFM" on this one:
  <http://developer.apple.com/documentation/Cocoa/Reference/Foundation/
  ObjC_classic/Classes/NSString.html#//apple_ref/doc/uid/20000154/
  doubleValue>
  
  Nick Zitzmann
  <http://www.chronosnet.com/>
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• Tom Bernard Re: Converting a string to a number Mar 24 2004, 10:04
      /*
      To: Joe Lertola <joe...>
      On Mar 23, 2004, at 4:10 PM, Joe Lertola wrote:
  

      > If I have a NSString that contains a number how can I convert it into
      > a real number. For example if I have a NSString = "123.456 is my
      > number", how can I get the value 123.456 into a float?
      */
  

  
      NSString *myString = @"123.456 is my number";
      float myNumber = [myString floatValue];
  
  The debugger shows myNumber set to 123.456001
  
  Does that work for you? Note that the string must start with the number.
  
      NSString *myString = @"embedded number 123.456 is my number";
      float myNumber = [myString floatValue];
  
  yields myNumber set to 0.
  
  For embedded numbers, use an NSScanner.
  
      BOOL numberScanned, garbageScanned;
      NSScanner *myScanner = [NSScanner scannerWithString:myString];
      garbageScanned = [myScanner scanUpToCharactersFromSet:[NSCharacterSet
  characterSetWithCharactersInString:@".0123456789"] intoString:nil];
      numberScanned = [myScanner scanFloat:&myNumber];
  
  Tom Bernard
  <tombernard...>
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