题解 | 牛牛的圆
牛牛的圆
https://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
#include <iostream>
using namespace std;
int main() {
int r;
scanf("%d", &r);
printf("%f", 3.14 * r * r);
}
牛牛的圆
https://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
#include <iostream>
using namespace std;
int main() {
int r;
scanf("%d", &r);
printf("%f", 3.14 * r * r);
}
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