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