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[C++] 纯文本查看 复制代码

#include<iostream>

#include<iomanip>

#include<cmath>

using namespace std;

int main(){

        double Xa,Xb,Ya,Yb,B,A;

        cin>>Xa>>Ya>>Xb>>Yb;

        A=Xa-Xb;

        B=Ya-Yb;

        double C=sqrt(A*A+B*B);

        cout<<fixed<<setprecision(3)<<C;

        return 0;

}