题解 | #牛牛的圆#
牛牛的圆
https://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
#include <stdio.h> #include<math.h> int main() { int r = 0; scanf("%d", &r); float area = 0; //area = 3.14 * (r *r); //或者用pow函数 area = 3.14 * pow(r, 2); printf("%.2f", area); return 0; }