题目描述

(Circle Area) Write a C++ program that prompts the user for the radius of a circle, then calls inline function circleArea to calculate the area of that circle. π=3.14π=3.14


输入格式

The input consists of n (0<n<100) lines.
Each line consists of the double radius (ranges from 1 to 100).
The last line of input consists of Int(-1).


输出格式

The decimal precision of output is 5.


样例数据

输入

1.0
2
3
-1

输出

3.14000
12.56000
28.26000

备注


操作

评测记录

优秀代码

信息

时间限制: 1s
内存限制: 128MB
评测模式: Normal

题解