题解 | 牛牛的圆
牛牛的圆
https://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
#include <iostream>
using namespace std;
int main() {
int a;
cin>>a;
cout.precision(6);
cout <<fixed<<3.14*a*a;
return 0;
}
牛牛的圆
https://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
#include <iostream>
using namespace std;
int main() {
int a;
cin>>a;
cout.precision(6);
cout <<fixed<<3.14*a*a;
return 0;
}
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