移位操作实现乘法运算

Posted 2022-05-25 jocelynd-9

public class Muti 
    //把一个数向左移动n位相当于把该数乘以2的n次方
    public static int powerN(int m,int n)//m乘以2的n次方
        for(int i=0;i<n;i++)
            m=m<<1;    
        
        return m;
    
    
    public static void main(String[] args)
        System.out.println("3*8="+powerN(3,3));
        System.out.println("3*16="+powerN(3,4));