
Concept explainers
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?

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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