C Reference function acos()

Usage of acos():

double acos(double x);


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():


	#define PI 3.14159265

		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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