asinh(), asinhf(), asinhl()

Compute the inverse hyperbolic sine

Synopsis:

#include <math.h>

double asinh( double x );

float asinhf( float x );

long double asinhl( long double x );

Arguments:

x
The value for which you want to compute the inverse hyperbolic sine.

Library:

libm

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

Description:

These functions compute the inverse hyperbolic sine of x.

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

Returns:

The inverse hyperbolic sine (in radians) of x.

If x is: These functions return:
NaN NaN
±0 or ±Inf x
Subnormal x, and a domain error occurs

Errors:

FE_INVALID
The x argument is subnormal.

Examples:

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

int main( void )
{
    int except_flags;

    feclearexcept(FE_ALL_EXCEPT);

    printf( "%f\n", asinh( 0.5 ) );

    except_flags = fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW);
    if(except_flags) {
        /* An error occurred; handle it appropriately. */
    }

    return EXIT_SUCCESS;
}

produces the output:

0.481212

Classification:

ANSI, POSIX 1003.1

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