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Exam 6: Functions

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Question 1

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Select all that apply. Which of the following statement(s) about global variables is(are) true?

A) A global variable is accessible only to the main function.
B) A global variable is declared in the highest-level block in which it is used.
C) A global variable can have the same name as a variable that is declared locally within a function.
D) A global variable is the same as a named constant.
E) If a function contains a local variable with the same name as a global variable, the global variable's name takes precedence within the function.

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Question 2

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This is a dummy function that is called instead of the actual function it represents:

A) main
B) stub
C) a driver
D) an overloaded function

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Question 3

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A function _________ eliminates the need to place a function definition before all calls to the function.

A(n) __________ is information that is passed to a function, and a(n) __________ is information that is received by a function.

What will the following code display? #include <iostream> using namespace std; int getValue(int) ; int main() { $\quad$ int x = 2; $\quad$ cout << getValue(x) << endl; $\quad$ return 0; } int getValue(int num) { $\quad$ return num + 5; }

What will the following code display? #include <iostream> using namespace std; void doSomething(int&) ; int main() { $\quad$ int x = 2; $\quad$ cout << x << endl; $\quad$ doSomething(x) ; $\quad$ cout << x << endl; $\quad$ return 0; } void doSomething(int& num) { $\quad$ num = 0; $\quad$ cout << num << endl; }

This statement causes a function to end.

The value in this type of variable persists between function calls.

What is the data type of the following function prototype's return value? Int myFunction(double) ;

What will the following code display? #include <iostream> using namespace std; void doSomething(int) ; int main() { $\quad$ int x = 2; $\quad$ cout << x << endl; $\quad$ doSomething(x) ; $\quad$ cout << x << endl; return 0; } void doSomething(int num) { $\quad$ num = 0; $\quad$ cout << num << endl; }

Local variables are initialized to zero by default.

Given the following header for a function named computeValue, which of the following is a valid call to the function? Void computeValue(int value)

Functions are ideal for menu-driven programs. When the user selects a menu item, the program can __________ the appropriate function.

It is possible for a function to have some parameters with default arguments and some without.

If a function is called more than once in a program, the values stored in the function's local variables do not _________ between function calls.

A collection of statements that performs a specific task is a(n)

It is not considered good programming practice to declare all your variables globally.

A __________ argument is passed to a parameter when the actual argument is left out of the function.

In the following function prototype, how many parameter variables does this function have? Int myFunction(double, double, double) ;

You must always furnish an argument with a function call.