分解质因数

public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
String str = input.nextLine();
int num = Integer.parseInt(str);
//int num = 100;
String s = "";
int i = 2;
while(i <= num)
{
if(num % i == 0)
{
if(i == num)
s = s + i;
else
s = s + i + "*";
num = num / i;
}
else
{
i++;
}
}
System.out.println("分解质因子： "  + str + "=" + s);
}