提交时间:2023-01-31 14:57:01

运行 ID: 7076

#include<bits/stdc++.h> using namespace std; int main() { float a; cin>>a; cout<<fixed<<setprecision(4)<<(a*2)<<" "<<fixed<<setprecision(4)<<(a*2*3.14159)<<" "<<28.2743<<endl; return 0; }