Opengl draw cresent moon c++

//first circle moon
	int moonr = 50;
	int mooncenterx = 700;
	int mooncentery = 500;
	int moonsteps = 100;
	float circleangle = PI * 2.0f;
	glColor3f(1.0, 1.0, 1.0);
	glBegin(GL_TRIANGLE_FAN);

	for (int a = 0; a <= moonsteps; a++) {
		float angle = circleangle * float(a) / float(moonsteps);//get the current angl
		float moonx = moonr * cosf(angle);//calculate the x component
		float moony = moonr * sinf(angle);//calculate the y component
		glVertex2f(moonx + mooncenterx, moony + mooncentery);//output vertex
	}
	glEnd();

	//second circle moon
	int moon2r = 50;
	int mooncenter2x = 725;
	int mooncenter2y = 525;
	int moonsteps2 = 100;
	float circleangle2 = PI * 2.0f;
	glColor3f(0.5, 0.9, 0.4);
	glBegin(GL_TRIANGLE_FAN);

	for (int b = 0; b <= moonsteps; b++) {
		float angle2 = circleangle * float(b) / float(moonsteps2);//get the current angle
		float moon2x = moonr * cosf(angle2);//calculate the x component
		float moon2y = moonr * sinf(angle2);//calculate the y component
		glVertex2f(moon2x + mooncenter2x, moon2y + mooncenter2y);//output vertex
	}
	glEnd();

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