Write a programme of DDA line Algoritham in C?

 DDA Line Algoritham

#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;

    initgraph(&gd,&gm,"c:\\turboc3\\bgi");

 

    printf("Enter the value of x1 and y1 : ");

    scanf("%f%f",&x1,&y1);

    printf("Enter the value of x2 and y2: ");

    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();

}   

Output :