需要輸出的所有質數

Question

爲例如60答案應該是2 2 3 5，但只有2 3 5

import java.util.Scanner; 

public class PrimeFactor { 

    public static void main(String[] args) { 

     System.out.print("Enter a positive number: "); 

     Scanner scanner = new Scanner (System.in); 

     int number = scanner.nextInt(); 

     int count; 

     for (int i = 2; i<=(number); i++) { 
      count = 0; 

      while (number % i == 0) { 
       number /= i; 
       count++; 
        } 

      if (count == 0) { 
        continue; 
      } 
      System.out.print(i + " "); 
     } 
    } 
} 

Answer 1

出現的問題是，一旦它發現60整除2，它一直分爲2（在這種情況下是兩次）。

的地方是System.out.print AFTER while語句的最終支架和它的工作原理：

public static void main(String[] args) { 

     System.out.print("Enter a positive number: "); 

     Scanner scanner = new Scanner (System.in); 

     int number = scanner.nextInt(); 

     int count; 

     for (int i = 2; i<=(number); i++) { 
      count = 0; 

      while (number % i == 0) { 
       number /= i; 
       count++; 


      if (count == 0) { 
        continue; 
      } 
      System.out.print(i + " "); 
      } 
     } 
    } 

Answer 2

如果您想用不同的方式來做到這一點：

import java.util.*; 
import java.lang.*; 

class Main 
{ 
     public static void main (String[] args) throws java.lang.Exception 
     { 
      System.out.print("Enter a positive number: "); 
      Scanner scanner = new Scanner (System.in); 

      int number = scanner.nextInt(); 

      int divisor = 2; 
      while(number != 1) { 
      if(number % divisor == 0) { 
       System.out.println(divisor + " "); 
       number /= divisor; 
      } 
      else { 
       divisor++; 
      } 
     } 
    } 
}