Starting Out with C++: Early Objects
Starting Out with C++: Early Objects
8th Edition
ISBN: 9780133360929
Author: Tony Gaddis, Judy Walters, Godfrey Muganda
Publisher: Addison-Wesley
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Chapter 14, Problem 1RQE

What type of recursive function do you think would be more difficult to debug; one that uses direct recursion or one that uses indirect recursion? Why?

Expert Solution & Answer
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Program Plan Intro

Recursive Function:

  • The function has ability to call itself is called recursion function.
  • It is a substitute method for reiteration.
  • It replaces the loop statements, so without loop statement it executes the algorithm codes a number of times.
  • Selection statement is used to make a decision for the execution of the recursion.
  • There are two types of recursive functions. They are:
    • Direct recursion
    • Indirect recursion

Direct recursion:

When a function calls itself repeatedly until the condition becomes false is called as direct recursion.

Example:

//method definition

void test()

{

    //call a function

    test();

}

Indirect recursion:

When a function calls another function which in turn calls the same calling function is called as indirect recursion.

Example:

//method definition

void test()

{

    //call a function

    test1();

}

//method definition

void test1()

{

    //call a function

    test();

}

Explanation of Solution

Recursion that is difficult to debug:

The recursion that is difficult to debug is “Indirect recursion”.

Justification:

  • Because, a function calls one function which is linked to another function.
  • Since, a function can make multiple calls to a function; it is difficult to track the flow control of function that is being processed within the code.

Therefore, “Indirect recursion” is difficult to debug when compared to direct recursion.

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