DDA Line Drawing Algorithm in C.c

#include<graphics.h>
#include<stdio.h>
#include<math.h>
int main()
{
	int gd,gm,x,y,pixel,x1,x2,y1,y2,dx,dy;
	detectgraph(&gd,&gm);
	initgraph(&gd,&gm,"C://TurboC3//BGI");
	
	printf("Enter the value of x1 : ");
	scanf("%d",&x1);
	printf("Enter the value of y1 : ");
	scanf("%d",&y1);
	printf("Enter the value of x2 : ");
	scanf("%d",&x2);
	printf("Enter the value of y2 : ");
	scanf("%d",&y2);
	
	dx=abs(x1-x2);
	dy=abs(y1-y2);
	
	if(dx>=dy)
		pixel=dx;
	else
		pixel=dy;
	
	dx=dx/pixel;
	dy=dy/pixel;
	
	x=x1;
	y=y1;
	
	while(pixel--)
	{
		putpixel(x,y,WHITE);
		x=x+dx;
		y=y+dy;
		delay(100);
	}
	
	getch();
	closegraph();
	return 0;
}