@[Sx0528](/user/1368822) 周长和面积反了
```cpp
cout<<fixed<<setprecision(4)<<s<<" ";
cout<<fixed<<setprecision(4)<<c<<" ";
```
改为:
```cpp
cout<<fixed<<setprecision(4)<<c<<" ";
cout<<fixed<<setprecision(4)<<s<<" ";
```
by 5520qq @ 2024-07-09 19:45:28
@[5520qq](/user/836448) OK!
by Sx0528 @ 2024-07-10 08:59:07
@[Sx0528](/user/1368822)
```cpp
#include <bits/stdc++.h>
using namespace std ;
int main(){
double n ;
cin >> n ;
printf("%.4lf", n * 2) ;
printf(" ") ;
printf("%.4lf", n * 2 * 3.14159) ;
printf(" ") ;
printf("%.4lf", n * n * 3.14159) ;
return 0 ;
}
```
by a23GCC @ 2024-07-26 18:14:26