2020-10-19递归 求和

package j2ee_1019;

public class DiGui {

    /**
     * 递归测试
     * @param args
     */
    public static void main(String[] args) {

        //测试递归
        DiGui diGui = new DiGui();
        System.out.println(diGui.sum(10));
    }
    
    //递归 求和 
    public int sum(int a) {
        
        if (a == 1) {
            return 1;
        }
        return sum(a-1)+a;//定点查看数值变化
        
    }

}

递归.jpg