Chess Board

#include <windows.h>
#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>
#include<iostream>
using namespace std;

int c=0,x,y;
int i=71;

void Init()
{
    glClearColor(1.0, 1.0, 1.0, 1.0);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0, 400, 0,400);

}

void chessboard(int x1,int y1,int x2,int y2,int x3,int y3,int x4,int y4)
{
    cout<<x1<<" "<<y1<<" "<<x2<<" "<<y2<<" "<<x3<<" "<<y3<<" "<<x4<<" "<<y4<<"\n";

    glBegin(GL_POLYGON);
        if(c==0){
        glColor3f(0.902, 0.902, 0.980);
        c = 1;
        }
        else{
            glColor3f(0.125, 0.698, 0.667);
            c=0;
        }
        glVertex2i(x1, y1);
        glVertex2i(x2, y2);
        glVertex2i(x3, y3);
        glVertex2i(x4, y4);
    glEnd();
}

void display()
{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    for(x = 0; x <= 400; x += 50){
        for(y = 0; y <= 400; y += 50){
            chessboard(x, y + 50, x + 50, y + 50, x + 50, y, x, y);
        }
    }

    glFlush();
}


int main(int argc, char *argv[])
{

    glutInit(&argc, argv);
    glutInitWindowSize(400,400);
    glutInitWindowPosition(400,200);
    glutInitDisplayMode(GLUT_RGB);

    glutCreateWindow("Polygon drawing");
    glutDisplayFunc(display);
    Init();

    glutMainLoop();

    return 0;
}