Rectangles Color

#include<Windows.h>
#include<gl/GL.h>
#include<gl/glu.h>
#include<gl/glut.h>
#include<math.h>
#include <iostream>

using namespace std;

const int screenWidth = 480;
const int screenHeight = 640;
GLfloat r , g, b;


void myInit(void)
{
	glClearColor(1.0, 1.0, 1.0, 0.0);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0, (GLdouble)screenWidth, 0, (GLdouble)screenHeight); 
}
void Recti() {
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0, 0.0, 0.0);//red
	glRecti(30, 40, 90, 120);
	glColor3f(0.0, 1.0, 0.0);//green
	glRecti(120, 40, 180, 120);
	glColor3f(0.0, 0.0, 1.0);//blue
	glRecti(210, 40, 270, 120);
	glColor3f(0.5, 0.5, 0.5);//grey
	glRecti(300, 40, 360, 120);
	glColor3f(0.0, 0.0, 0.0);//black
	glRecti(390, 40, 450, 120);
	glFlush();
}
void mouse(int bin, int state, int x, int y) {	
if (bin == GLUT_LEFT_BUTTON && state == GLUT_DOWN) {
	if (x > 30 && x < 120 && y>390) {
		r = 1.0;
		g = 0.0;
		b = 0.0;
	}
	else if (x > 150 && x < 245 && y>390) {
		r = 0.0;
		g = 1.0;
		b = 0.0;
	}
	else if (x > 270 && x < 360 && y>390) {
		r = 0.0;
		g = 0.0;
		b = 1.0;
	}
	else if (x > 390 && x < 480 && y>390) {
		r = 0.5;
		g = 0.5;
		b = 0.5;
	}
	else if (x > 510 && x < 600 && y>390) {
		r = 0.0;
		g = 0.0;
		b = 0.0;
	}
	else
	{
		r = 1.0;
		g = 1.0;
		b = 1.0;
	}
}
glColor3f(r, g, b); //bigRecti
glRecti(30, 160, 450, 600);
glFlush();
}
int main(int argc, char** argv)
{
	glutInit(&argc, argv);
	glutInitWindowSize(screenHeight,screenWidth);
	glutInitWindowPosition(300, 100);
	glutCreateWindow("Rectangle Color");
	glutMouseFunc(mouse);
	glutDisplayFunc(Recti);
	myInit();
	glutMainLoop();
}