java语言程序设计(基础篇)第十版编程练习题[1.8]

(圆的面积和周长)编写程序，使用以下公式计算并显示半径为5.5的圆的面积和周长。

周长 = 2 × 半径 × π
面积 = 半径 × 半径 × π

/*
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*/
package dome1_8;

/**
*
* @author Administrator
*/
public class Dome1_8 {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
double radius = 5.5;//半径
double pi = 3.14;
System.out.println("周长:" + (2 * radius * pi));
System.out.println("面积:" + (radius * radius * pi));
}

}