【NYOJ】[101]两点距离

[code]#include<stdio.h>
#include<math.h>
int main() {
    int T;
    scanf("%d",&T);
    while(T--) {
        double x1,y1,x2,y2;
        scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2);
        printf("%.2lf\n",sqrt(pow(x1-x2,2)+pow(y1-y2,2)));
    }
    return 0;
}

[code]#include<iostream>
#include<math.h>
#include<iomanip>
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<<setprecision(2)<<a<<endl;
    }
    return 0;
}