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