Create a header file and include DDA algorithm as a function and draw rectangle ,triangle and pentagon

Code for header file “dda.h

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>

void bres(int,int,int,int);

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

{

float dx,dy,Xinc,Yinc,x,y;

int gd=DETECT,gm;

int temp,temp1,i;

initgraph(&gd,&gm,"");

if(x1>x2 || y1>y2)

{

temp=x1;

x1=x2;

x2=temp;

temp1=y1;

y1=y2;

y2=temp1;

}

dx=abs(x2-x1);

dy=abs(y2-y1);

if(dx>dy)

  temp=dx;

 else

  temp=dy;

Xinc=dx/temp;

Yinc=dy/temp;

x=x1;

y=y1;

putpixel(x,y,3);

for(i=1;i<=temp;i++)

{

x+=Xinc;

y+=Yinc;

putpixel((int)x,(int)y,3);

}

}

Code For Main Program

#include<graphics.h>

#include<conio.h>

#include<stdio.h>

#include”z:\dd.h”

void main()

{

int gd=DETECT,gm;

initgraph(&gd,&gm,"");

//code for rectangle.

bres(20,20,100,20);

bres(20,20,20,100);

bres(100,20,100,100);

bres(20,100,100,100);

//code for triangle.

bres(250,250,350,125);

bres(350,125,450,250);

bres(250,250,450,250);

//code for pentagon

bres(100,100,150,200);

bres(100,100,50,200);

bres(50,200,50,300);

bres(150,200,150,300);

bres(50 ,300,150,300);

getch();

}

OUTPUT: