将一个正整数分解质因数。例如：输入90,打印出90=2*3*3*5。

Posted 2020-07-24 凌零聆

package a;

import java.util.*;

public class Fenjiezhiyinshu {

    public static void main(String[] args) {
        System.out.println("输入一个正整数:");
        Scanner a=new Scanner(System.in);
        int m=a.nextInt();
        int k=2;        
        if(m==1)
        {
            System.out.println("输入的数为m="+m);
        }
        else
        {
            System.out.print(m+"=");
            while (k <= m) 
           {
            if (k == m) {
            System.out.print(m);
            break;
            }
            else if (m % k == 0)
            {
            System.out.print(k + "*");
            m = m / k;
            } 
            else
            {
            k++;
            }
          }
       }    
    }

}