0 0 0 1 0 1 1 0
1.00 1.41
#include<stdio.h>
#include<math.h>
int main()
{
float x1,y1,x2,y2,result;
while(scanf("%f%f%f%f",&x1,&y1,&x2,&y2)!=EOF)
{
result=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
printf("%.2f\n",result);
}
return 0;
}
原文：http://www.cnblogs.com/slgkaifa/p/6748176.html