#include 
#include 
#include 
#define MAX 20

enum { TOP = 0x1, BOTTOM = 0x2, RIGHT = 0x4, LEFT = 0x8 };

enum { FALSE, TRUE };
typedef unsigned int outcode;

outcode compute_outcode(int x, int y,
		int xmin, int ymin, int xmax, int ymax)
{
    outcode oc = 0;

    if (y > ymax)
	oc |= TOP;
    else if (y < ymin)
	oc |= BOTTOM;


    if (x > xmax)
	oc |= RIGHT;
    else if (x < xmin)
	oc |= LEFT;

    return oc;
}

void cohen_sutherland (double x1, double y1, double x2, double y2,
		double xmin, double ymin, double xmax, double ymax)
{
    int accept;
    int done;
    outcode outcode1, outcode2;

    accept = FALSE;
    done = FALSE;

    outcode1 = compute_outcode (x1, y1, xmin, ymin, xmax, ymax);
    outcode2 = compute_outcode (x2, y2, xmin, ymin, xmax, ymax);
    do
    {
	if (outcode1 == 0 && outcode2 == 0)
	{
	    accept = TRUE;
	    done = TRUE;
	}
	else if (outcode1 & outcode2)
	{
	    done = TRUE;
	}
	else
	{
	    double x, y;
	    int outcode_ex = outcode1 ? outcode1 : outcode2;
	    if (outcode_ex & TOP)
	    {
		x = x1 + (x2 - x1) * (ymax - y1) / (y2 - y1);
		y = ymax;
	    }

	    else if (outcode_ex & BOTTOM)
	    {
		x = x1 + (x2 - x1) * (ymin - y1) / (y2 - y1);
		y = ymin;
	    }
	    else if (outcode_ex & RIGHT)
	    {
		y = y1 + (y2 - y1) * (xmax - x1) / (x2 - x1);
		x = xmax;
	    }
	    else
	    {
		y = y1 + (y2 - y1) * (xmin - x1) / (x2 - x1);
		x = xmin;
	    }
	    if (outcode_ex == outcode1)
	    {
		x1 = x;
		y1 = y;
		outcode1 = compute_outcode (x1, y1, xmin, ymin, xmax, ymax);
	    }
	    else
	    {
		x2 = x;
		y2 = y;
		outcode2 = compute_outcode (x2, y2, xmin, ymin, xmax, ymax);
	    }
	}
    } while (done == FALSE);

    if (accept == TRUE)
	line (x1, y1, x2, y2);
}



void main()
{
    int n;
    int i, j;
    int ln[MAX][4];
    int clip[4];
    int gd = DETECT, gm;

    printf ("Enter the number of lines to be clipped");
    scanf ("%d", &n);

    printf ("Enter the x- and y-coordinates of the line-endpoints:\n");
    for (i=0; i
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