@[Harry_Haiyun](/user/977778) 你真的会输入输出吗。
by FuckYouJinhai @ 2023-05-10 18:44:31
@[Harry_Haiyun](/user/977778) double输入输出占字符%lf
by Esawkm @ 2023-05-10 18:44:50
我感觉你今天发了七八个帖子了啊？
by Resolute_Faith @ 2023-05-10 18:57:56
@[Harry_Haiyun](/user/977778) 14分钟4帖，还都是入门题，你真的有思考过吗？
by Mo默Sh笙 @ 2023-05-10 19:18:46
6
by Diamond_ZuanShi @ 2023-06-10 11:05:52
6
by dingyyds11111 @ 2023-07-14 21:45:20
6
by yjh18605886822 @ 2023-07-21 18:57:48
```c
#include<stdio.h>
#define PI 3.14159
int main()
{
double r,d,c,s;
scanf("%lf",&r);
d=2*r;
c=2*PI*r;
s=PI*r*r;
printf("%.4f %.4f %.4f",d,c,s);
return 0;
}
```
by banlangen @ 2023-07-23 00:35:45
```
//我的做法是c与c++结合简化输入输出
//片段：
int main(){
...
cin>>r
printf("%.4lf %.4lf %.4lf",2*r,2*pi*r,r*r*pi);
return 0;
}
```
by wuyinan @ 2023-08-03 18:39:35
真幽默
by SeriousFairy @ 2023-08-08 12:31:36