fabs(), fabsf(), fabsl()

Compute the absolute value of a double number

Synopsis:

#include <math.h>

double fabs( double x );

float fabsf( float x );

long double fabsl( long double x );

Arguments:

x
The number you want the absolute value of.

Library:

libm

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

Description:

The fabs(), fabsf(), and fabsl() functions compute the absolute value of x.

Returns:

The absolute value of x.

Examples:

#include <stdio.h>
#include <math.h>
#include <stdlib.h>

int main( void )
{
    printf( "%f %f\n", fabs(.5), fabs(-.5) );
    return EXIT_SUCCESS;
}

produces the output:

0.500000 0.500000

Classification:

ANSI, POSIX 1003.1

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