杭电ACM 2001 计算两点间距离-C语言

http://acm.hdu.edu.cn/showproblem.php?pid=2001

#include <stdio.h>
#include <math.h> 
int main()
{
    double x1,y1,x2,y2,temp;
	while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2)!=EOF){
		temp=sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
		printf("%.2lf\n",temp);
	}
    return 0;
}