Implement the following two static methods Note that althoug

Implement the following two static methods. Note that, although the two methods compute the same function, the first one clears the givenNaturalNumber while the second one restores it.

/**

* Returns the product of the digits of {@code n}.

*

* @param n

*            {@code NaturalNumber} whose digits to multiply

* @return the product of the digits of {@code n}

* @clears n

* @ensures productOfDigits1 = [product of the digits of n]

*/

private static NaturalNumber productOfDigits1(NaturalNumber n) {...}

/**

* Returns the product of the digits of {@code n}.

*

* @param n

*            {@code NaturalNumber} whose digits to multiply

* @return the product of the digits of {@code n}

* @ensures productOfDigits2 = [product of the digits of n]

*/

private static NaturalNumber productOfDigits2(NaturalNumber n) {...}

Solution

Hi, Please find my implementation.

Please let me know in case of any issue.

Hi, you have not given the structure of class NaturalNumber

I am assuming that NaturalNumber class has one method : getNumber() and setNumber(int num)

1)
/**
* Returns the product of the digits of {@code n}.
*
* @param n
* {@code NaturalNumber} whose digits to multiply
* @return the product of the digits of {@code n}
* @clears n
* @ensures productOfDigits1 = [product of the digits of n]
*/
private static NaturalNumber productOfDigits1(NaturalNumber n) {
  
   int number = n.getNumber();

   if(number == 0)
       return 0;

   int mul = 1;

   while(number > 0){

       mul = mul*(number/10);

       number = number/10;
   }

   return mul;

}

2)
/**
* Returns the product of the digits of {@code n}.
*
* @param n
* {@code NaturalNumber} whose digits to multiply
* @return the product of the digits of {@code n}
* @ensures productOfDigits2 = [product of the digits of n]
*/
private static NaturalNumber productOfDigits2(NaturalNumber n) {
   int number = n.getNumber();

   if(number == 0)
       return 0;

   int mul = 1;

   while(number > 0){

       mul = mul*(number/10);

       number = number/10;
   }

   // crearing NaturalNumber
   n.setNumber(0);

   return mul;
}