asin(), asinf(), asinl()
Compute the arcsine of an angle
Synopsis:
#include <math.h> double asin( double x ); float asinf( float x ); long double asinl( long double x );
Arguments:
- x
- The sine for which you want to find the angle.
Library:
libm
Use the -l m option to qcc to link against this library.
Description:
These functions compute the value of the arcsine (specified in radians) of x.
Returns:
The arcsine, in the range (-π/2, π/2). For finite values not in the range [-1,1], these functions return NaN. The return value for +/-Inf is NaN.
If an error occurs, these functions return 0, but this is also a valid
mathematical result.
If you want to check for errors, set
errno
to 0, call the function, and then check errno again.
These functions don't change errno if no errors occurred.
Examples:
#include <stdio.h> #include <math.h> #include <stdlib.h> int main( void ) { printf( "%f\n", asin(.5) ); return EXIT_SUCCESS; }
produces the output:
0.523599
Classification:
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |