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OpenDarwin 7.2.1 - man page for fdim (opendarwin section 3)

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FDIM(3) 			   BSD Library Functions Manual 			  FDIM(3)

NAME
     fdim -- return difference if positive, 0 otherwise

SYNOPSIS
     #include <math.h>

     double
     fdim(double x, double y);

     float
     fdimf(float x, float y);

DESCRIPTION
     The fdim() and fdimf() functions return the "positive difference" between their arguments:
     x - y if x > y, +0 if x is less than or equal to y.

SEE ALSO
     fma(3), fmax(3), fmin(3)

STANDARDS
     The fdim() and fdimf() functions conform to ISO/IEC 9899:1999(E).

BSD					  July 24, 2003 				      BSD
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