asin() - math.h

The C library function double asin(double x) returns the arc sine of x in radians.

Syntax

double asin(double x)

Example

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

#define PI 3.14159265

int main ()
{
   double x, ret, val;
   x = 0.9;
   val = 180.0 / PI;

   ret = asin(x) * val;
   printf("The arc sine of %lf is %lf degrees", x, ret);
   
   return(0);
}

Output / Return Value

The arc sine of 0.900000 is 64.158067 degrees

Limitations

Alternatives / See Also

Reference