Convert to absolute value in Objective-C

Question

How do I convert a negative number to an absolute value in Objective-C   i e   -10   becomes  10

User · Answer

You can use this function to get the absolute value     NSNumber   absoluteValue  NSNumber   input     return  NSNumber numberWithDouble fabs  input doubleValue

User · Answer

Depending on the type of your variable  one of abs int   labs long   llabs long long   imaxabs intmax t   fabsf float   fabs double   or fabsl long double    Those functions are all part of the C standard library  and so are present both in Objective-C and plain C  and are generally available in C   programs too     Alas  there is no habs short  function  Or scabs signed char  for that matter        Apple s and GNU s Objective-C headers also include an ABS   macro which is type-agnostic  I don t recommend using ABS   however as it is not guaranteed to be side-effect-safe  For instance  ABS a    will have an undefined result     If you re using C   or Objective-C    you can bring in the  lt cmath gt  header and use std  abs    which is templated for all the standard integer and floating-point types

[objective-c] Convert to absolute value in Objective-C

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