Write a program Write a program to implement DDA line drawing algorithm

 
 
#include < graphics.h >
#include < stdio.h >
#include < math.h >
#include < dos.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();
}