代码:
package com.liron.p1;import java.util.Scanner;/**将一个正整数分解质因数。例如:输入90,打印出90=2*3*3*5。*/public class Topic14 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("请输入一个正整数:"); int num = sc.nextInt();//int num = 90;int k = 2;System.out.print(num + "=");//输出第一步格式while (num > k) {//初值k为2,num为输入的数字,在程序执行的过程中k渐渐变大(k++),n渐渐变小(num/k)if (num % k == 0) {System.out.print(k + "×");//如果num <> k,但n能被k整除,则应打印出k的值num = num / k;//num除以k的商,作为新的正整数你num}else if (num % k != 0) {k++;}}System.out.println(k);}}
结果: