C Reference function acos()
Usage of acos():
double acos(double x);
Parameters:
The value x must be within the range of -1 to +1 (inclusive).
Return value:
The returned value is in the range of 0 to pi (inclusive).
Source code example of acos():
#include<stdio.h>
#include<math.h>
#define PI 3.14159265
main()
{
double input, output;
input = 0.8;
output = acos (input) * 180.0 / PI;
printf ("Arc cosine of %lf is %lf degrees.\n", input, output );
return 0;
}
Output of the acos example program above:
Arc cosine of 0.800000 is 36.869898 degrees.
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