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guqingchen

[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;
}