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

int main() {
	double x = 3.14;

	// An array of three pointers to functions.
	double (*arr_fn[3])( double );
	arr_fn[0] = sin;
	arr_fn[1] = cos;
	arr_fn[2] = tan;

	printf( "sin(%f) = %f, cos(%f) = %f, tan(%f) = %f\n",
	        x, arr_fn[0](x), x, arr_fn[1](x), x, arr_fn[2](x) );

	return 0;
}