两点距离

 1 #include <stdio.h> 
 2 #include <math.h>
 3 
 4 int main(){
 5     int T;
 6     double a;
 7     double b;
 8     double c;
 9     double d;
10     double distance;
11     
12     scanf("%d",&T);
13     
14     while(T--){
15         scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
16         
17         distance=sqrt((a-c)*(a-c)+(b-d)*(b-d));
18         
19         printf("%.2lf\n",distance);
20     }
21     return 0;
22 }