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