newlib/libc/stdlib/abs.c

   1 /*
   2 FUNCTION
   3 <<abs>>---integer absolute value (magnitude)
   4
   5 INDEX
   6         abs
   7
   8 SYNOPSIS
   9         #include <stdlib.h>
  10         int abs(int <[i]>);
  11
  12 DESCRIPTION
  13 <<abs>> returns
  14 @tex
  15 $|x|$,
  16 @end tex
  17 the absolute value of <[i]> (also called the magnitude
  18 of <[i]>).  That is, if <[i]> is negative, the result is the opposite
  19 of <[i]>, but if <[i]> is nonnegative the result is <[i]>.
  20
  21 The similar function <<labs>> uses and returns <<long>> rather than <<int>> values.
  22
  23 RETURNS
  24 The result is a nonnegative integer.
  25
  26 PORTABILITY
  27 <<abs>> is ANSI.
  28
  29 No supporting OS subroutines are required.
  30 */
  31
  32 #include <stdlib.h>
  33
  34 int
  35 abs (int i)
  36 {
  37   return (i < 0) ? -i : i;
  38 }