Development of Line using DDA Algorithm

// C program for DDA line generation
#include<stdio.h>
#include<graphics.h>
int abs (int n)
{
    return ( (n>0) ? n : ( n * (-1)));
}
void DDA(int X0, int Y0, int X1, int Y1)
{
    int dx,dy,steps,i;
    float Xinc,Yinc,X,Y;
    dx = X1 - X0;
    dy = Y1 - Y0;
    steps = abs(dx) > abs(dy) ? abs(dx) : abs(dy);
    Xinc = dx / (float) steps;
    Yinc = dy / (float) steps;
    X = X0;
    Y = Y0;
    for (i = 0; i <= steps; i++)
    {
putpixel (X,Y,YELLOW);
X += Xinc;
Y += Yinc;
delay(50);
    }
}
void main()
{
    int gd = DETECT, gm;
    initgraph (&gd, &gm, "C:\\TurboC3\\BGI");
    DDA(100, 100, 300, 100);
    getch();
    DDA(300, 100, 300, 300);
    getch();
    DDA(300, 300, 100, 300);
    getch();
    DDA(100, 300, 100, 100);
    getch();
    DDA(100, 100, 300, 300);
    getch();
    DDA(300, 100, 100, 300);
    getch();
    closegraph();
}