递归小练习

package IO.file.test;

public class diguiDemo {

    public static void main(String[] args) {
        show(6);//十进制转二进制
        System.out.println(sum(4));//1+2+3+4+....值
    }
    public static void show(int num)
    {
        if(num>0){
            System.out.println(num%2);
            show(num/2);
        }
    }
    public static int sum(int num)
    {
        if(num==1)
            return 1;
        return num+sum(num-1);
    }
}