蓝桥网试题 java 基础练习 分解质因数

--------------------------------------------------------------------------

递归更多的用在多分支情况中

本题用循环就可以了

用递归就麻烦了

--------------------------------------------------------------------------

 import java.util.*;
 public class Main {
     public static void main(String[] args) {
         Scanner sc = new Scanner(System.in);
         int n1 = sc.nextInt();
         int n2 = sc.nextInt();
         int[] a = new int[n2-n1+1];
         if(n1==n2)
             a[0] = n1;
         else
             for(int i=n1,j=0;i<=n2;i++,j++)
                 a[j] = i;
         for(int i=0;i<a.length;i++){
             StringBuffer st = new StringBuffer(a[i]+"=");
             int z = 2,tmp = a[i];
             while(z<=tmp){
                 if(tmp%z==0){
                     if(st.charAt(st.length()-1)!='=')st.append("*");
                     st.append(z);
                     tmp = tmp/z;
                     z = 2;
                 }else
                     z++;
             }
             System.out.println(st);
         }
     }
 }