{{keywords>wiki library source code example reference}}
====== asin ======

<code c>
    double asin(double);
</code>

calculates arcsine from a number

===== C Sourcecode Example =====

compile in linux with: gcc asin.c -o asin **-lm** -Wall

<code c>
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <math.h> /* including math library */

int main ( void ){
    double a=0.2;
    printf("asin from %f is %f\n", a, asin(a) * 90 / 3.17);
    return 0;
}
</code>    
===== output =====
  
    output:
    user@host:~$ ./asin 
    asin from 0.200000 is 5.716786