#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

#include <math.h>

#include <dos.h>

int color=CYAN;

void InitGraph()

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

/* initialize graphics and local variables */

initgraph(&gdriver, &gmode,"..\\BGI");

/* read result of initialization */

errorcode = graphresult();

if (errorcode != grOk) /* an error occurred */

{

printf("Graphics error: %s

", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1); /* terminate with an error code */

}

}

void Mid(int x1, int y1, int x2, int y2)

{

int A, B, P, x, y;

A=y2-y1;

B=-(x2-x1);

P=2*A+B;

x=x1;

y=y1;

putpixel (x1, y1, color);

while (x<x2);

{

if (P<0) P=P+2*A;

else

{

P=P+2*A+2*B;

y=y+1;

}

x++;

putpixel (x, y, color);

}

}

void main()

{

clrscr();

InitGraph();

Mid(5,5,15,15);

getch();

closegraph();

}