#include
#include
#include
#include

#define MAX 20

void swap(int* a,int* b)
{
	int t=*a;
	*a=*b;
	*b=t;
}

void midpointline(int x1,int y1,int x2,int y2)
{
	int dx,dy,d,incry,incre,incrne,slopegt1=0;
	dx=abs(x1-x2);dy=abs(y1-y2);
	if(dy>dx)
	{
		swap(&x1,&y1);
		swap(&x2,&y2);
		swap(&dx,&dy);
		slopegt1=1;
	}
	if(x1>x2)
	{
		swap(&x1,&x2);
		swap(&y1,&y2);
	}
	if(y1>y2)
		incry=-1;
	else
		incry=1;
	d=2*dy-dx;
	incre=2*dy;
	incrne=2*(dy-dx);
	while(x1
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