circlearea.java

计算圆面积的程序源代码

package circlearea;

//求圆的面积
public class CircleArea {
    //圆周率pi
    public final static float PI = 3.1415926f;
    public static void main(String[] args) {
        //圆的半径
        float radius = 15.2f;
        float area;
        //求圆面积公式: 2 * PI * radius
        area = 2*PI*radius;
        //显示圆的面积
        System.out.println("圆的面积为:"+area);
    }
}