dda.c

#include<graphics.h>
#include<stdio.h>
#include<math.h>
#include<dos.h>
#include<conio.h>
void main()
{
float x,y,x1,y1,x2,y2,dx,dy,step;
int i,gd=DETECT,gm;
clrscr();
detectgraph(&gd,&gm);
initgraph(&gd,&gm,"c:\\Turboc++\\Disk\\Turboc3\\BGI");
printf("Enter the value of x1 and y1 \n");
scanf("%f%f",&x1,&y1);
printf("Enter the value of x2 and y2 \n");
scanf("%f%f",&x2,&y2);
dx=abs(x2-x1);
dy=abs(y2-y1);
if(dx>=dy)
step=dx;
else
step=dy;
dx=dx/step;
dy=dy/step;
x=x1;
y=y1;
i=1;
while(i<=step)
{
putpixel(x,y,5);
x=x+dx;
y=y+dy;
i=i+1;
delay(100);
}
closegraph();
getch();
}