Question

Why is it important to initialize the loop control variable for WHILE loops?

What does the parameter in the function call below do?

doStuff(**z);

What is the difference between function overloading and Default arguments?

Of the two techniques in No. 7, when would you use one over the other?

Answer 1

Why is it important to initialize the loop control variable for WHILE loops?

For counting while loop it is very important to initialize the control variable because if don't initialize then loop wont execute.

Example :

int a=1;

while(a<=5)

{

cout<<a<<" ";

a++;

}

here a is initialized with 1 so if you wont initialize the a then while loop wont be executed due its condition.

What does the parameter in the function call below do?

doStuff(**z);

It is a declaration of data function (doStuff) with one parameter which is a pointer to pointer means it is pointing the value of a pointer variable which has address of another pointer variable in it.  

What is the difference between function overloading and Default arguments?

Function overloading - A function overloading is a compile-time polymorphism in which one class has many functions with same name but different signature.

Syntax : (Here, functionName is same for both the definition ,returntype or parameters may vary)

returntype functionName()

{

}

returntype functionName(datatype variableName)

{

}

Default arguments - Default arguments are the values provided in a function declaration that assigned values to the formal variables.

Syntax :

returntype functionaname(datatype variableName=value)

{

}

Note : You haven't mentioned No.7 question or two techniques

"Of the two techniques in No. 7, when would you use one over the other?"