蓝桥杯-分解质因数

import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int x , y;
		for (int i = a; i <= b; i++) {
			System.out.print(i + "=");
			x = su(i);//求i中最小的素数值
			y = x;
			if (x == i) {
				System.out.println(i);
			} else {
				System.out.print(x + "*");
				while (true) {
					x = su(i / y);//i中下一个素数值
					if (x == 1)//i中无素数退出循环
						break;
					y *= x;
					if (y != i)
						System.out.print(x + "*");
					else
						System.out.println(x);
				}
			}
		}
	}
 
	private static int su(int i) {
		for (int j = 2; j < i; j++) {
			if (i % j == 0) {
				return j;
			}
		}
		return i;
	}
}