DDA Line Drawing

#include<stdio.h>
#include<graphics.h>
#include<math.h>
#include<dos.h>
#include<conio.h>



int ROUND(float a){
    a=a+0.5;
    return ((int)a);
}

void lineDDA(int x1, int y1, int x2, int y2){
     int dx=x2-x1,dy=y2-y1, steps, k;
     float xincrement, yincrement, x=x1, y=y1;
     if(abs(dx)>abs(dy))steps=abs(dx);
     else steps=abs(dy);
      xincrement=dx/(float)steps;
      yincrement=dy/(float)steps;
      putpixel(ROUND(x), ROUND(y),5);
     for(k=0;k<steps;k++){
              delay(50);
              x+=xincrement;
              y+=yincrement;
              putpixel (ROUND(x), ROUND(y), 5);
              }
}


void main()
{
    int x1,y1,x2,y2,gmode,gdriver=DETECT;
    initgraph(&gdriver, &gmode,"C:\\TURBOC3\\BGI");

    printf("Enter the Start point.");
    scanf("%d%d",&x1,&y1);
    printf("Enter the End point.");
    scanf("%d%d",&x2,&y2);
    clrscr();
    lineDDA(x1,y1,x2,y2);
    getch();
}