2<=a<=b<=10000

程式碼：



import java.util.Scanner;


public class Main {
public static boolean isPrime(int num)
{
for(int i=2; i*i<=num; i++)
{
if(num%i == 0) return false;
}
return true;
}
public static void main(String[] args) {
Scanner in = new  Scanner(System.in);
int a = in.nextInt();
int b = in.nextInt();
int flag=0;
for(int i=a; i<=b; i++)
{
flag=0;
int num=i;
while(num!=1)
{
for(int j=2;j<=num;j++)
{
if(isPrime(j) && num%j==0)
{
if(flag==0)
{
System.out.print(num+"="+j);
flag=1;
num=num/j;
break;
}else {
System.out.print("*"+j);
num=num/j;
break;
}
}
}
}
System.out.println();
}
}
}