Draw a pyramid using c graphic

  

#include <stdio.h>

  #include <conio.h>

  #include <graphics.h>

  #include <dos.h>

  int main() {

        /* request auto detection */

        int gdriver = DETECT, gmode, err;

        int color, fillstyle, poly[10];

        int i, midx, midy;

        /* initialize graphic device */

        initgraph(&gdriver, &gmode, "C:/TURBOC3/BGI");

        err = graphresult();

        if (err != grOk) {

                /* error occurred */

                printf("Graphics Error: %s",

                                grapherrormsg(err));

                return 0;

        }

        /* mid positions in x and y-axis */

        midx = getmaxx() / 2;

        midy = getmaxy() / 2;

        color = WHITE;

        fillstyle = WIDE_DOT_FILL;

        /* drawing triangle at the top of the pyramid */

        setcolor(color);

        setfillstyle(fillstyle, color);

        poly[0] = midx, poly[1] = midy - 100;

        poly[2] = midx - 20, poly[3] = midy - 70;

        poly[4] = midx + 20, poly[5] = midy - 70;

        poly[6] = midx, poly[7] = midy - 100;

        drawpoly(4, poly);

        floodfill(midx - 18, midy - 72, color);

        sleep(1);

        /* drawing second top layer of the pyramid */

        color--, fillstyle--;

        setcolor(color);

        setfillstyle(fillstyle, color);

        poly[0] = midx - 20, poly[1] = midy - 70;

        poly[2] = midx + 20, poly[3] = midy - 70;

        poly[4] = midx + 40, poly[5] = midy - 40;

        poly[6] = midx - 40, poly[7] = midy - 40;

        poly[8] = midx - 20, poly[9] = midy - 70;

        drawpoly(5, poly);

        floodfill(poly[0] + 1, poly[1] + 1, color);

        sleep(1);

        /* drawing subsequent layer of the pyramids */

        for (i = 0; i < 8; i++) {

                color--, fillstyle--;

                setcolor(color);

                setfillstyle(fillstyle, color);

                poly[0] = poly[0] - 20, poly[1] = poly[1] + 30;

                poly[2] = poly[2] + 20, poly[3] = poly[3] + 30;

                poly[4] = poly[4] + 20, poly[5] = poly[5] + 30;

                poly[6] = poly[6] - 20, poly[7] = poly[7] + 30;

                poly[8] = poly[8] - 20, poly[9] = poly[9] + 30;

                drawpoly(5, poly);

                floodfill(poly[0] + 1, poly[1] + 1, color);

                sleep(1);

        }

        getch();

        /* deallocate memory allocated for graphic screen */

        closegraph();

        return 0;

  }