example02_circle.java

java课程设计教材上的程例题序代码

package example;

public class Example02_Circle {
	public static void main(String[] args) {
		double r = 10;
		
		double c = 2 * Math.PI * r;
		double s = Math.PI * r * r;
		
		System.out.println("c = " + c);
		System.out.println("s = " + s);
	}
}