#include<stdio.h> #include<stdlib.h> int main(){ double x1,x2,x3,x4,y1,y2,y3,y4; while(scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2)!=EOF){ scanf("%lf %lf %lf %lf",&x3,&y3,&x4,&y4); double k1,k2; if(x1==x2){ if(x3==x4)printf("NO\n"); else printf("YES\n"); } else{ if(x3==x4) printf("YES\n"); else{ k1=(y2-y1)/(x2-x1); k2=(y4-y3)/(x4-x3); if(k1==k2)printf("NO\n"); else printf("YES\n"); } } } } |
Double click to view unformatted code.