View Code of Problem 67

#include<stdio.h>
int main()
{
	float x1,x2,x3,x4,y1,y2,y3,y4,k1,k2;
	while(scanf("%f%f%f%f%f%f%f%f",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4) != EOF)
	{
		k1 = (y2 - y1) / (x2 - x1);
		k2 = (y4 - y3) / (x4 - x3);
		if(k1 == k2)
		{
			printf("NO\n");
		}
			else
			{
				printf("YES\n");
			}
	}
 } 

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