acos

Calculates the arc cosine of x.

That is the value whose cosine is x. If x falls outside the range -1 to 1, GLib.Math.acos fails and GLib.errno is set to EDOM .

Example: Arc cosine (double):

public static int main (string[] args) {
	// Output: ``acos (0.500000) = 1.047198``
	double x = 0.5;
	double res = Math.acos (x);
	print("acos (%lf) = %lf\n", x, res);


	// Output: ``acos (1.000000) = 0.000000``
	x = 1;
	res = Math.acos (x);
	print("acos (%lf) = %lf\n", x, res);


	// Output: ``acos (2.000000) = nan``
	x = 2;
	res = Math.acos (x);
	print("acos (%lf) = %lf\n", x, res);

	return 0;
}

valac --pkg glib-2.0 -X -lm GLib.Math.acos.vala