hdu2001
http://acm.hdu.edu.cn/showproblem.php?pid=2001
一道很简单的题不知道哪里错了，一直是wa感觉没有错呀，就是ac不过去
#include <stdio.h>
#include <stdlib.h>
int main()
{
double x1,x2,y1,y2,res;
while(scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2)!=EOF)
{
res=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
printf("%.2lf\n",res);
}
return 0;
}
