INPUT

#include<stdio.h>
#include<graphics.h>

void drawline(int x0, int y0, int x1, int y1)
{
int dx, dy, p, x, y;

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;
}
}

int main()
{
int gdriver=DETECT, gmode, error, x0, y0, x1, y1;
initgraph(&gdriver, &gmode, "c:\\turboc3\\bgi");

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

printf("Enter co-ordinates of second point: ");
scanf("%d%d", &x1, &y1);
drawline(x0, y0, x1, y1);

getch();
}


OUTPUT