fdim(), fdimf(), fdiml()

Compute the positive different between two floating-point numbers

Synopsis:

#include <math.h>

double fdim( double x,
             double y );

float fdimf( float x,
             float y );

long double fdiml( long double x,
                   long double y );

Arguments:

x, y
The numbers that you want to compute the difference between.

Library:

libm

Use the -l m option to qcc to link against this library.

Description:

The fdim(), fdimf(), and fdiml() functions compute the positive different between two floating-point numbers. If x is greater than y, then these function return x - y. If x is less than or equal to y, these functions return +0.

To check for error situations, use feclearexcept() and fetestexcept():

Returns:

The positive difference.

Errors:

FE_OVERFLOW
The result overflows.
FE_UNDERFLOW
The result underflows.

Classification:

ANSI, POSIX 1003.1

Safety:  
Cancellation point No
Interrupt handler No
Signal handler No
Thread Yes