/*
 * Professional Linux Programming - Trig Functions
 * Author: Jon Masters <jcm@jonmasters.org>
 */

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

#define MAX_INPUT 25

int main(int argc, char **argv)
{
	char input[MAX_INPUT];
	double angle;
	
	printf("Give me an angle (in radians) ==> ");
	if (!fgets(input, MAX_INPUT, stdin)) {
		perror("an error occurred.\n");
	}
	angle = strtod(input, NULL);

	printf("sin(%e) = %e\n", angle, sin(angle));
	printf("cos(%e) = %e\n", angle, cos(angle));
	printf("tan(%e) = %e\n", angle, tan(angle));
	
	return 0;
}