Draw a Chess Board using Graphics Programming in C

// C program to create a chess board
#include <conio.h>
#include <dos.h>
#include <graphics.h>
#include <stdio.h>

// Driver Code
void main()
{
    // Auto detection
    int gr = DETECT, gm;
    int r, c, x = 30, y = 30, black = 0;

    // Initialize graphics mode by passing
    // three arguments to initgraph function

    // &gdriver is the address of gdriver
    // variable, &gmode is the address of
    // gmode and  "C:\\Turboc3\\BGI" is the
    // directory path where BGI files are stored
    initgraph(&gr, &gm, "C:\\TURBOC3\\BGI");

    // Iterate over 8 rows
    for (r = 0; r < 8; r++) {

        // iterate over 8 cols
        for (c = 1; c <= 8; c++) {

            // If current block is to
            // color as black
            if (black == 0) {

                // set next color as white
                setcolor(WHITE);

                // sets the current fill
                // pattern and fill color
                // for black boxes
                setfillstyle(SOLID_FILL, BLACK);

                // creating rectangle
                // with length and breadth
                // with size 30
                rectangle(x, y, x + 30, y + 30);

                // Fill an enclosed area
                floodfill(x + 1, y + 1, WHITE);

                // Set black to true
                black = 1;
            }

            // If current block is to
            // color as white
            else {
                setcolor(WHITE);

                // sets the current fill
                // pattern and fill color
                // for whitw boxes
                setfillstyle(SOLID_FILL, WHITE);

                // creating rectangle
                // with length and breadth
                // with size 30
                rectangle(x, y, x + 30, y + 30);

                // Fill an enclosed area
                floodfill(x + 1, y + 1, WHITE);

                // Set black to false
                black = 0;
            }

            // Increment for next row
            x = x + 30;

            // delay function under library
            // "dos.h" for holding the
            // function for some time
            delay(30);
        }
        if (black == 0)
            black = 1;
        else
            black = 0;

        delay(30);
        x = 30;
        y = 30 + y;
    }

    // getch is used to hold the output screen
    // and wait until user gives any type of
    // input in turbo c
    getch();

    // close graph function is used to exit
    // from the graphics screen
    closegraph();
}