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4349 Serge 1 
/*
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FUNCTION
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<>---integer absolute value (magnitude)
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INDEX
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	abs
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ANSI_SYNOPSIS
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	#include
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	int abs(int <[i]>);
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TRAD_SYNOPSIS
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	#include
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	int abs(<[i]>)
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	int <[i]>;
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DESCRIPTION
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<> returns
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@tex
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$|x|$,
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@end tex
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the absolute value of <[i]> (also called the magnitude
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of <[i]>).  That is, if <[i]> is negative, the result is the opposite
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of <[i]>, but if <[i]> is nonnegative the result is <[i]>.
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The similar function <> uses and returns <> rather than <> values.
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RETURNS
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The result is a nonnegative integer.
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PORTABILITY
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<> is ANSI.
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No supporting OS subroutines are required.
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*/
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#include
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int
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_DEFUN (abs, (i), int i)
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{
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  return (i < 0) ? -i : i;
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}