Deck 6: Functions

Question 1

In a function header, you must furnish

A) data type(s) of the parameters
B) data type of the return value
C) the name of function
D) names of parameter variables
E) All of these

Answer 1

E

Question 2

This function causes a program to terminate, regardless of which function or control mechanism is executing.

A) terminate()
B) return()
C) continue()
D) exit()
E) None of these

Answer 2

D

Question 3

A function is executed when it is

A) defined
B) prototyped
C) declared
D) called
E) None of these

Answer 3

D

Question 4

_________ functions may have the same name, as long as their parameter lists are different.

A) Only two
B) Two or more
C) Zero
D) Un-prototyped
E) None of these

Question 5

Given the following function definition void calc (int a, int& b)
{
Int c;
C = a + 2;
A = a * 3;
B = c + a;
}
What is the output of the following code fragment that invokes calc?
(All variables are of type int)
X = 1;
Y = 2;
Z = 3;
Calc(x, y);
Cout << x << " " << y << " " << z << endl;

A) 1 2 3
B) 1 6 3
C) 3 6 3
D) 1 14 9
E) None of these

Question 6

When used as parameters, these types of variables allow a function to access the parameter's original argument.

A) reference
B) floating-point
C) counter
D) undeclared
E) None of these

Question 7

This is a statement that causes a function to execute.

A) for loop
B) do-while loop
C) function prototype
D) function call
E) None of these

Question 8

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

A) header
B) prototype
C) argument
D) parameter
E) None of these

Question 9

A ___________ variable is declared outside all functions.

A) local
B) global
C) floating-point
D) counter
E) None of these

Question 10

This type of variable is defined inside a function and is not accessible outside the function.

A) global
B) reference
C) local
D) counter
E) None of these

Question 11

It is a good programming practice to ____________ your functions by writing comments that describe what they do.

A) execute
B) document
C) eliminate
D) prototype
E) None of these

Question 12

A function can have zero to many parameters, and it can return this many values.

A) zero to many
B) no
C) only one
D) a maximum of ten
E) None of these

Question 13

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

A) call
B) prototype
C) define
D) declare
E) None of these

Question 14

A function __________ contains the statements that make up the function.

A) definition
B) prototype
C) call
D) expression
E) parameter list

Question 15

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

A) function call, function header
B) parameter, argument
C) argument, parameter
D) prototype, header
E) None of these

Question 16

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

A) global
B) internal
C) static
D) dynamic
E) None of these

Question 17

Which of the following statements about global variables is 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) 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.
E) All of these are true

Question 18

This is a collection of statements that performs a specific task.

A) infinite loop
B) variable
C) constant
D) function
E) None of these

Question 19

This statement causes a function to end.

A) end
B) terminate
C) return
D) release
E) None of these

Question 20

These types of arguments are passed to parameters automatically if no argument is provided in the function call.

A) Local
B) Default
C) Global
D) Relational
E) None of these

Question 21

Look at the following function prototype. int myFunction(double, double, double);
How many parameter variables does this function have?

A) 1
B) 2
C) 3
D) Can't tell from the prototype

Question 22

What is the output of the following program? #include
Using namespace std;
Void doSomething(int);
Int main()
{
Int x = 2;
Cout << x << endl;
DoSomething(x);
Cout << x << endl;
Return 0;
}
Void doSomething(int num)
{
Num = 0;
Cout << num << endl;
}

A) 2
0
2
B) 2
2
2
C) 0
0
0
D) 2
0
0

Question 23

The value in a(n) _______ variable persists between function calls.

A) dynamic
B) local
C) counter
D) static local

Question 24

Look at the following function prototype. int myFunction(double);
What is the data type of the funtion's return value?

A) int
B) double
C) void
D) Can't tell from the prototype

Question 25

What is the output of the following program? #include
Using namespace std;
Void doSomething(int&);
Int main()
{
Int x = 2;
Cout << x << endl;
DoSomething(x);
Cout << x << endl;
Return 0;
}
Void doSomething(int& num)
{
Num = 0;
Cout << num << endl;
}

A) 2
0
2
B) 2
2
2
C) 0
0
0
D) 2
0
0

Question 26

A parameter is a special-purpose variable that is declared inside the parentheses of a function definition.

Question 27

A local variable and a global variable may not have the same name within the same program.

Question 28

Which line in the following program contains the prototype for the showDub function? 1 #include
2 using namespace std;
3
4 void showDub(int);
5
6 int main()
7 {
8 int x = 2;
9
10 showDub(x);
11 cout << x << endl;
12 return 0;
13 }
14
15 void showDub(int num)
16 {
17 cout << (num * 2) << endl;
18 }

A) 4
B) 6
C) 10
D) 15

Question 29

A(n) _________ argument is passed to a parameter when the actual argument is left out of the function call.

A) false
B) true
C) null
D) default
E) None of these

Question 30

Which line in the following program contains a call to the showDub function? 1 #include
2 using namespace std;
3
4 void showDub(int);
5
6 int main()
7 {
8 int x = 2;
9
10 showDub(x);
11 cout << x << endl;
12 return 0;
13 }
14
15 void showDub(int num)
16 {
17 cout << (num * 2) << endl;
18 }

A) 4
B) 6
C) 10
D) 15

Question 31

If a function does not have a prototype, default arguments may be specified in the function ___________.

A) call
B) header
C) execution
D) return type
E) None of these

Question 32

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) persist
B) execute
C) communicate
D) change
E) None of these

Question 33

Here is the header for a function named computeValue: void computeValue(int value)
Which of the following is a valid call to the function?

A) computeValue(10)
B) computeValue(10);
C) void computeValue(10);
D) void computeValue(int x);

Question 34

Which line in the following program contains the header for the showDub function? 1 #include
2 using namespace std;
3
4 void showDub(int);
5
6 int main()
7 {
8 int x = 2;
9
10 showDub(x);
11 cout << x << endl;
12 return 0;
13 }
14
15 void showDub(int num)
16 {
17 cout << (num * 2) << endl;
18 }

A) 4
B) 6
C) 10
D) 15

Question 35

When a function is called, flow of control moves to the function's prototype.

Question 36

EXIT_FAILURE and __________ are named constants that may be used to indicate success or failure when the exit() function is called.

A) EXIT_TERMINATE
B) EXIT_SUCCESS
C) EXIT_OK
D) RETURN_OK
E) None of these

Question 37

What is the output of the following program? #include
Using namespace std;
Void showDub(int);
Int main()
{
Int x = 2;
ShowDub(x);
Cout << x << endl;
Return 0;
}
Void showDub(int num)
{
Cout << (num * 2) << endl;
}

A) 2
2
B) 4
2
C) 2
4
D) 4
4

Question 38

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

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

Question 39

What is the output of the following program? #include
Using namespace std;
Int getValue(int);
Int main()
{
Int x = 2;
Cout << getValue(x) << endl;
Return 0;
}
Int getValue(int num)
{
Return num + 5;
}

A) 5
B) 2
C) 7
D) "getValue(x)"

Question 40

Look at the following function prototype. int myFunction(double);
What is the data type of the funtion's parameter variable?

A) int
B) double
C) void
D) Can't tell from the prototype

Question 41

A function's return data type must be the same as the function's parameter(s).

Question 42

One reason for using functions is to break programs into manageable units, or modules.

Question 43

Local variables are initialized to zero by default.

Question 44

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

Question 45

Global variables are initialized to zero by default.

Question 46

You must furnish an argument with a function call.

Question 47

You may use the exit() function to terminate a program, regardless of which control mechanism is executing.

Question 48

A static variable that is defined within a function is initialized only once, the first time the function is called.

Question 49

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