hdu 101

import java.util.*;

public class Main {

  public static void main(String args[]){

 Scanner cin=new Scanner(System.in);

 int n=cin.nextInt();

 Double result=0.00d;

   for(int i=0;i

    Double x1= cin.nextDouble();    

    Double y1= cin.nextDouble();   

    Double x2= cin.nextDouble();   

    Double y2= cin.nextDouble();   

 

    result=Math.pow(x1-x2, 2)+Math.pow(y1-y2, 2);

      java.text.DecimalFormat myformat=new java.text.DecimalFormat("0.00");

      String str = myformat.format(Math.sqrt(result));    

    System.out.println(str);

 

   }

 

  }

  

}

刚开始忘加了 Math.sqrt真是尴尬

 

#include

#include

#include

using namespace std;

int main()

{

/*freopen("1.txt","r",stdin);

freopen("2.txt","w",stdout);*/

double x1,x2,y1,y2,m;

double a;

cin>>m;

while(m--)

{

cin>>x1>>y1>>x2>>y2;

    a=sqrt((double)((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));

cout.setf(ios::fixed); 

    cout<

}

return 0;

}

 

        

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