log1p(), log1pf(), log1pl()

Log(1+x)

Synopsis:

#include <math.h>

double log1p ( double x );

float log1pf ( float x );

long double log1pl( long double x );

Arguments:

x
The number that you want to add 1 to and compute the natural log of.

Library:

libm

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

Description:

The log1p(), log1pf(), and log1pl() functions compute the value of log(1+x), where x > -1.0.

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

Returns:

log(1+x)

Classification:

ANSI, POSIX 1003.1

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