HSV -> RGB.cpp

#include <iostream>
#include <cmath>

// RGB color struct
struct Color { int r, g, b; };

// Round float to int
int round(float f) { return (f - (int)f >= 0.5) ? (f + 1) : f; }

// Returns an RGB color from an HSV one 
Color hsv(int h, float s, float v)
{
	// h: Hue [0, 360]
	// s: Saturation [0, 1]
	// v: Value [0, 1]
	float r, g, b;
	float c = v * s;
	float x = c * (1.0 - std::fabs(std::fmod(h / 60.0, 2) - 1.0));
	float m = v - c;
	
	switch(h / 60)
	{
		case 0:
			r = c + m;
			g = x + m;
			b = m;
			break;
		case 1:
			r = x + m;
			g = c + m;
			b = m;
			break;
		case 2:
			r = m;
			g = c + m;
			b = x + m;
			break;
		case 3:
			r = m;
			g = x + m;
			b = c + m;
			break;
		case 4:
			r = x + m;
			b = m;
			g = c + m;
			break;
		case 5:
			r = c + m;
			b =  m;
			g = x + m;
			break;
		default:
			r = g = b = m;
	}
	
	return {round(r*255), round(g*255), round(b*255)};
}

int main()
{
	int h;
	float s, v;
	std::cin >> h >> s >> v;
	
	Color c = hsv(h, s, v);
	std::cout << c.r << " " << c.g << " " << c.b << std::endl;

	return 0;
}