Could you help me  the following question Below is a recursive function written in Java that takes 2 integers and returns an integer:       public static int gcd(int x, int y)     {         if (y == 0)             return x;         else             return gcd(y, x/y);     }   Answer the following multiple choice questions. Remember that multiple answers can still apply.   Based on how this code is exactly written, if we called this function with “gcd(25, 15);” from main, which of the following is true: In the first function instance of gcd, x will be 25 and y will be 15. This will not trigger the base case so a recursive function call to gcd will then occur When the base case is finally reached, y will be 0 and x will be 5 We will be in the 4th function instance of gcd when the base case is reached None of the above

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Could you help me  the following question

Below is a recursive function written in Java that takes 2 integers and returns an integer:

 

    public static int gcd(int x, int y)

    {

        if (y == 0)

            return x;

        else

            return gcd(y, x/y);

    }

 

Answer the following multiple choice questions. Remember that multiple answers can still apply.

 

  • Based on how this code is exactly written, if we called this function with “gcd(25, 15);” from main, which of the following is true:
    1. In the first function instance of gcd, x will be 25 and y will be 15. This will not trigger the base case so a recursive function call to gcd will then occur
    2. When the base case is finally reached, y will be 0 and x will be 5
    3. We will be in the 4th function instance of gcd when the base case is reached
    4. None of the above
  • If we changed the code in the else block to “return gcd(y, x%y);”, which of the following would then be true:
    1. If we call “gcd(5,5);”, we will get an infinite loop
    2. If we call “gcd(7,3);”, then in the first function instance of gcd, x will be 7 and y will be 3. This will trigger the base case and return 1
    3. If we call “gcd(3,7);”, we will eventually get a return value of 1 from the 4th function instance of the recursive execution
    4. None of the above
  • Which of the following is true about recursion in general:
    1. The base case is where the recursion occurs and where we would see code that calls itself
    2. Recursive functions can also be written using an iterative loop, though the complexity of the code may increase and we may need to incorporate using other data structures like a stack
    3. Recursive functions run faster if we use a Linked List implementation instead
    4. None of the above

 

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