View Code of Problem 67

#include "stdio.h"
#include "math.h"
#include "string.h"

void  main()
{
	double x1,y1,x2,y2,x3,y3,x4,y4;									
	for(;scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF;)
	{
		if(x1!=x2&&x3!=x4)				//分母不能0
		{
			if((y2-y1)/(x2-x1)==(y4-y3)/(x4-x3))
			{
				if(y1-x1*((y2-y1)/(x2-x1))==y3-x3*(y4-y3)/(x4-x3))
					printf("Yes\n");
				else
					printf("No\n");
			}
			else
				printf("Yes\n");
		}
		else if(x1==x2&&x3==x4)
		{
			if(x1==x3)
				printf("Yes\n");
			else
				printf("No\n");
		}
		else
			printf("Yes\n");
		
	}
}

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