#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"); } } |
Double click to view unformatted code.