mirror of
https://git.sb/baoshuo/OI-codes.git
synced 2024-11-05 16:38:48 +00:00
13 lines
204 B
C++
13 lines
204 B
C++
|
#include <bits/stdc++.h>
|
||
|
|
|
||
|
|
using namespace std;
|
||
|
|
|
||
|
|
const double pi = 3.14159265358979323;
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
int r;
|
||
|
|
scanf("%d", &r);
|
||
|
|
printf("%.6lf\n%.6lf\n", r * r * pi, r * r * 2.0);
|
||
|
|
return 0;
|
||
|
|
}
|