**#include<stdio.h>**

#include<math.h>

#include<conio.h>

#include<graphics.h>

#define round(val) (int)(val+0.5)

void main()

{

int gd=DETECT,gm;

void line_dda(int,int,int,int);

int xa,xb,ya,yb;

printf("Enter the two values");

scanf("%d%d%d%d",&xa,&ya,&xb,&yb); initgraph(&gd,&gm,"");

cleardevice();

line_dda(xa,ya,xb,yb);

getch();

closegraph();

}

void line_dda(int xa,int ya,int xb,int yb)

{

int Dx=xb-xa,Dy=yb-ya,steps,k;

float xin,yin,X=xa,Y=ya;

if(abs(Dx)>abs(Dy))

steps=abs(Dx);

else

steps=abs(Dy);

xin=Dx/(float)steps;

yin=Dy/(float)steps;

putpixel(round(X),round(Y),6);

for(k=0;k<steps;k++)

{

X=X+xin;

Y=Y+yin;

putpixel(round(X),round(Y),6);

}

}

#include<math.h>

#include<conio.h>

#include<graphics.h>

#define round(val) (int)(val+0.5)

void main()

{

int gd=DETECT,gm;

void line_dda(int,int,int,int);

int xa,xb,ya,yb;

printf("Enter the two values");

scanf("%d%d%d%d",&xa,&ya,&xb,&yb); initgraph(&gd,&gm,"");

cleardevice();

line_dda(xa,ya,xb,yb);

getch();

closegraph();

}

void line_dda(int xa,int ya,int xb,int yb)

{

int Dx=xb-xa,Dy=yb-ya,steps,k;

float xin,yin,X=xa,Y=ya;

if(abs(Dx)>abs(Dy))

steps=abs(Dx);

else

steps=abs(Dy);

xin=Dx/(float)steps;

yin=Dy/(float)steps;

putpixel(round(X),round(Y),6);

for(k=0;k<steps;k++)

{

X=X+xin;

Y=Y+yin;

putpixel(round(X),round(Y),6);

}

}