题解 | #牛牛的圆#
牛牛的圆
https://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
知识点:运算
#include <iostream> #include <cmath> #include <iomanip> using namespace std; int main() { int r = 0; float pi = 3.14; float area = 0.0; cin >> r; area = pi * pow(r, 2); cout << fixed << setprecision(2); cout << area; return 0; }#算法#