Write a program for Bresenham Line Draw Algorithm in C

/*
    Bresenham Line  Draw Algorithm
*/
#include<stdio.h>
#include<graphics.h>
#include<conio.h>

int main()
{
    int dx, dy, p, x, y;
    int gd=DETECT, gm, x0, y0, x1, y1;

    clrscr();

    printf("Enter co-ordinates of first point: ");
    scanf("%d%d", &x0, &y0);

    printf("Enter co-ordinates of second point: ");
    scanf("%d%d", &x1, &y1);

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

    dx=x1-x0;
    dy=y1-y0;

    x=x0;
    y=y0;

    p=2*dy-dx;

    while(x<x1)
    {
        if(p>=0)
        {
            putpixel(x,y,7);
            y=y+1;
            p=p+2*dy-2*dx;
        }
        else
        {
            putpixel(x,y,7);
            p=p+2*dy;
        }
        x=x+1;
    }

    getch();
    closegraph();
    return 0;
}

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