간단한 Factorial~

/**
 factorual
 
 [다음]
 
  input number(2~9)? 5
 
  1 * 2 * 3 * 4 * 5 = 결과
 
 
 */

class Assignment2
{
 public static void main(String[]args) throws Exception{
  int fac,result=1;
  while(true)
  {
   System.out.print("\nInput number(2 ~ 9)? ");
   fac=System.in.read()-'0';
   System.in.read();
   if(fac<2 || fac>9)
    System.out.println("Input Error!\nTry Again!");
   else break;
  }
  for(int i=1;i<=fac;i++)
  {
   result*=i;
   System.out.print(i);
   if(i==fac) System.out.print(" = "+result);
   else System.out.print(" * ");
  }
 }
}