View Code of Problem 67

#include "stdio.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)
		{
			if((y3-y4)/(x3-x4)==(y1-y2)/(x1-x2))	//斜率
			{
				if(y1-x1*((y1-y2)/(x1-x2))==y3-x3*((y3-y4)/(x3-x4)))						//b1与b2:重合?			
					printf("Yes\n");
				else
					 printf("No\n");
			}
			else
				printf("Yes\n");
		}
		else if((x1==x2&&x3==x4))			//分母0
		{
			if(x1==x3)
				printf("Yes\n");
			else
				printf("No\n");
		}
		else
			printf("Yes\n");
		//printf("%.2lf %.2lf",k1,k2);
		

	}
}

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