2089.cpp

哈尔滨工业大学ACM 竞赛网上在线试题集锦的源代码

/*  This Code is Submitted by wywcgs for Problem 2089 on 2005-10-03 at 15:59:38 */ 
#include <stdio.h>
#include <math.h>

typedef struct {
	double x;
	double y;
} Point;

int same(Point*, Point*);
	
int main()
{
	Point a[2], b[2];
	int sx, sy, flag;
	double fx, fy;
	
	while(scanf("%lf %lf %lf %lf %lf %lf %lf %lf", 
		&a[0].x, &a[0].y, &a[1].x, &a[1].y, &b[0].x, &b[0].y, &b[1].x, &b[1].y) == 8) {
		flag = 0;
		for(sx = 0; sx < 2; sx++) {
			for(sy = 0; sy < 2; sy++) {
				if(same(&a[sx], &b[sy])) {
					flag = 1;
					break;
				}
			}
			if(flag == 1) {
				break;
			}
		}
		fx = a[1-sx].x + b[1-sy].x - b[sy].x;
		fy = a[1-sx].y + b[1-sy].y - b[sy].y;
		if(fabs(fx) < 1e-4) {
			fx = 0;
		}
		if(fabs(fy) < 1e-4) {
			fy = 0;
		}
		printf("%.3lf %.3lf\n", fx, fy);
	}
		
	return 0;
}

int same(Point *x, Point *y)
{
	if(fabs(x->x-y->x) < 1e-4 && fabs(x->y-y->y) < 1e-4) {
		return 1;
	} else {
		return 0;
	}
}