sample_2.java

java课程的资料以及实验的代码

class Sample_2{
	public static void main(String args[]) {
		double pi,r,a; 
		r = 10.8; //半径
		pi = 3.1416; //圆周率
		a = pi * r * r; 
		System.out.println("面积为 " + a);
  }
}