Eigene Zeichenfunktion tut nichts, Rückgabewert sagt was anderes

//Header
bool drawRect(int X_Start, int Y_Start, int Width, int Height, HBRUSH brush);
bool drawRectSym(int Left, int Top, int Right, int Bottom, HBRUSH brush);

bool drawRect(int X_Start, int Y_Start, int Width, int Height, HBRUSH brush) {
	HDC screen = GetDC(0);

	const RECT coordinates = {X_Start, Y_Start, X_Start+Width, Y_Start+Height};

	if(FillRect(screen, &coordinates, brush) != 0) {
		return true;
	} else {
		return false;
	};
};

bool drawRectSym(int Left, int Top, int Right, int Bottom, HBRUSH brush) {
	HDC screen = GetDC(0);

	const RECT coordinates = {Left, Top, Right, Bottom};

	if(FillRect(screen, &coordinates, brush) != 0) {
		return true;
	} else {
		return false;
	};
};

//Main.cpp

int main() {	
	HBRUSH Bred = CreateSolidBrush(RGB(255, 0, 0));
	HBRUSH Bgreen = CreateSolidBrush(RGB(0, 255, 0));
	HBRUSH Bblue = CreateSolidBrush(RGB(0, 0, 255));
	bool returns[3] = {false, false, false};
	
	while(true) {
		printf("R: %s  |  G: %s  |  B: %s\n", returns ? "true" : "false", returns[1] ? "true" : "false", returns[2] ? "true" : "false");  
		returns = drawRectSym(100, 100, 100, 100, Bred);
		returns[1] = drawRectSym(200, 200, 200, 200, Bgreen);
		returns[2] = drawRectSym(400, 400, 400, 400, Bblue);
		Sleep(1000);
	};
	
	pause(); //Eig. unnötig, weil Endlosschleife
	return 0;
}