#include <bits/stdc++.h> using namespace std; int main(){ double r; cin>>r; printf("%.4f",r2);//直径 cout<<" "; printf("%.4f",23.14159r);//周长 cout<<" "; printf("%.4f",rr*3.14159);//面积 return 0; }

r = float(input()) d = "{:.4f}".format(2r) C = "{:.4f}".format(2r3.14159) S = "{:.4f}".format(3.14159r*r) print(d + " " + C + " " +S)

#include <iostream> using namespace std; int main() { double a,b,c,d; cin>>a; c=a2; b=a23.14159; d=aa*3.14159; printf("%.4f ", c ); printf("%.4f ", b ); printf("%.4f ", d ); return 0; }

#include<bits/stdc++.h> using namespace std; int main() { double a; cin>>a; printf("%.4f",a2); cout<<" "; printf("%.4f",a23.14159); cout<<" "; printf("%.4f",aa*3.14159); return 0; }

#include <iostream> #include <iomanip> using namespace std; int main() { double r; cin >> r; double diameter = r * 2; double circumference = 2 * 3.14159 * r; double area = 3.14159 * r * r; cout << fixed << setprecision(4) << diameter << " " << circumference << " " << area << endl; return 0; }

#include <iostream> #include <iomanip> using namespace std; int main() { double r; cin >> r; double diameter = r * 2; double circumference = 2 * 3.14159 * r; double area = 3.14159 * r * r; cout << fixed << setprecision(4) << diameter << " " << circumference << " " << area << endl; return 0; }

#include <iostream> #include <iomanip> // 用于设置输出的精度 using namespace std; int main() { const double PI = 3.14159; // 定义PI常量 double r; // 圆的半径 }

#include <iostream> using namespace std; int main(){ double r,r2,lon,b,PI = 3.14159; cin>>r; r2 = r2; lon = r2 * PI; b = rr*PI; printf("%.4lf %.4lf %.4lf",r2,lon,b); return 0; }

#include<iostream> #include<cstdio> using namespace std; int main(){ double r, d = 0, c = 0, s = 0; double PI = 3.14159; cin >> r; d = r * 2; c = r * 2 *PI; s = r * r * PI; printf("%.4f", d); cout << " "; printf("%.4f", c); cout << " "; printf("%.4f", s); return 0; }

#include<iostream> #include<iomanip> #include<cmath> using namespace std; int main(){ double r; cin>>r; cout<<std::fixed<<setprecision(4)<<r2<<" "<<r23.14159<<" "<<rr*3.14159; return 0; }

#include <bits/stdc++.h> using namespace std; int main(){ double r,PI=3.14159; cin>>r; printf("%.4f ",r2); printf("%.4f ",r2PI); printf("%.4f ",rr*PI); return 0; }