Consider the following recursive function: int Func(int num) { if (num == 0) return 0; else return num+Func(num+1); } 1. Is there a constraint on the values that can be passed as a parameter for this function to pass the smaller-caller question? 2. Is Func(7) a good call? If so, what is returned from the function? 3. Is Func(0) a good call? If so, what is returned from the function? 4. Is Func(-5) a good call? If so, what is returned from the function?

C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter15: Recursion
Section: Chapter Questions
Problem 8SA
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Consider the following recursive function:
int Func(int num)
{
if (num == 0)
return 0;
else
return num+Func(num+1);
}
1. Is there a constraint on the values that can be passed as a parameter for this function to pass
the smaller-caller question?
2. Is Func(7) a good call? If so, what is returned from the function?
3. Is Func(0) a good call? If so, what is returned from the function?
4. Is Func(-5) a good call? If so, what is returned from the function?  

Expert Solution
Step 1 For the Given recursive function

1) yes, it needs a constraint on the values that are passed as a parameter of this function to pass smaller-caller fuction.

2) For Func(7)

it will return the value as num+Func(num+1) i.e.

7+(7+1)=15

3) For Func(0)

it will return 0 as 

int Func(int num)
{
if (num == 0)
return 0;

4) If func(-5)

it will return the value, as per the function

-5+(-5+1)=-9

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