13
牛牛学圆
https://ac.nowcoder.com/acm/problem/21997
include
using namespace std;
int main()
{
double pi=3.14159,a;
cin>>a;
cout<<2pia<<endl;
cout<<piaa;
}
牛牛学圆
https://ac.nowcoder.com/acm/problem/21997
using namespace std;
int main()
{
double pi=3.14159,a;
cin>>a;
cout<<2pia<<endl;
cout<<piaa;
}
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