1588圆的面积

题目描述

    Give you the radius of a circle，caculate its area，PI=3.141592653。

输入

The first line of the input is a positive integer N,then follows N lines,each line is a real number represent the radius of the circle. 

输出

Output contains N lines,for each line of the input you should output one line, Case K: S,and K(count from 1)represents the number of the circle and S is the area.Keep two digits after the decimal point.

示例输入

3123

示例输出

Case 1: 3.14Case 2: 12.57Case 3: 28.27

提示

#include<stdio.h>
int main()
{
int r,a;
double s,pi;
pi=3.141592653;
    scanf("%d",&a);
while(a--)
{
scanf("%d",&r);
s=pi*r*r;
printf("Case %d: %.2lf",r,s);
printf("\n");
}
return 0;
}