Deck 5: Functions for All Sub Tasks

Question 1

A stub is a function that is completely defined and well tested

Answer 1

False

Question 2

A void function can be used in an assignment.

Answer 2

False

Question 3

A void function can return any value

Answer 3

False

Question 4

In a function with call-by-reference parameters, any changes to the formal parameters will change the actual arguments passed to the function.

Question 5

What is the correct way to call the following function? _________________________
void setDisplay);

Question 6

Given the following function definition fragment, for which values of myInt should the function be tested?
int doSomethingint myInt)
{
ifmyInt < 0)
{
//do some stuff here
}
}

Question 7

It is acceptable to have both call-by-value and call-by-reference parameters in the same function declaration.

Question 8

When the address of the actual argument is passed to the formal parameter, this is called __________________________

Question 9

A function that does not return a value is known as a ________ function.

Question 10

A void function may not be used in an output statement.

Question 11

The following is legal in a void function
return;

Question 12

If we want to test if a given function works correctly, we would write a _________ to test it.

Question 13

It is illegal to call other functions from inside a function definition.

Question 14

In a function with call-by-reference parameters, the values of the actual arguments are passed to the function.

Question 15

What symbol is used to signify that a parameter is a reference parameter? ______

Question 16

Functions can return at most one value.

Question 17

What type of value does a void function return? ____________

Question 18

The values or variables listed in the function declaration are called _________ to the function.

Question 19

A ___________ is a main program that only checks that functions execute correctly.

Question 20

The variables passed a function are called _________.

Question 21

Which of the following function prototypes are not valid?

A) void doSomethingint& x, int y);
B) void doSomething int& x, int& y);
C) void doSomething int x, int y);
D) all are not valid
E) all are valid

Question 22

What is the output of the following function and function call?
Void calculateCostint count, float& subTotal, float& taxCost);
Float tax = 0.0,
SubTotal = 0.0;
CalculateCost15, subTotal,tax);
Cout << "The cost for 15 items is " << subtotal
<< ", and the tax for " << subTotal << " is " << tax << endl;
//end of fragment
Void calculateCostint count, float& subTotal, float& taxCost)
{
If count < 10)
{
SubTotal = count * 0.50;
}
Else
{
SubTotal = count * 0.20;
}
TaxCost = 0.1 * subTotal;
}

A) The cost for 15 items is 3.00, and the tax for 3.00 is 0.30;
B) The cost for 15 items is 0.00, and the tax for 3.00 is 0.00;
C) The cost for 15 items is 0.00, and the tax for 3.00 is 0.30;
D) The cost for 15 items is 3.00, and the tax for 3.00 is 0.00;

Question 23

The preconditions) for a function describe:

A) What is true after the function is executed
B) What the function does
C) How to call the function
D) What must be true before the function executes

Question 24

Testing a program with values that are close to values that will change the execution of a program is called _________________.

Question 25

Call-by-reference parameters are passed

A) nothing
B) the actual argument.
C) the value in the actual argument.
D) the address of the argument.

Question 26

pre and post conditions for a function should be written before/after) the function definition is written.

Question 27

If you were to write a function for displaying the cost of an item to the screen, which function prototype would be most appropriate?

A) void display);
B) void displayfloat myCost);
C) int display float myCost);
D) float display);

Question 28

Given the function definition
Void something 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 something?
All variables are of type int.)
R = 1;
S = 2;
T = 3;
Somethingt, s);
Cout << r << ' ' << s << ' ' << t << endl;

A) 1 14 3
B) 1 10 3
C) 5 14 3
D) 1 14 9
E) none of the above

Question 29

If you need a function to get both the number of items and the cost per item from a user, which would be a good function declaration to use?

A) int,float getData);
B) int getDatafloat cost);
C) void getDataint count, float cost);
D) void getDataint& count, float& cost);

Question 30

Which of the following is true for a void function?

A) There cannot be a return statement.
B) The value of void should be returned.
C) The value of 0 should be returned.
D) Nothing is returned.

Question 31

The postcondition of a function

A) determines how the function will complete its job.
B) tells what must be true before the function executes.
C) declares the function for the compiler.
D) tells what will be true after the function executes.

Question 32

You should make a parameter a reference parameter if:

A) You need the function to change the value of the argument passed to the function.
B) you need to be able to change the value of the parameter in the function, but not the value of the argument.
C) Always.
D) If any of the other parameters are reference parameters.

Question 33

What is the correct way to call the following function? Assume that you have two variables named intArgument int) and floatArgumentfloat).
void doThingsfloat x, int y);

Question 34

What is the output of the following function and function call?
Void calculateCostint count, float& subTotal, float taxCost);
Float tax = 0.0,
Subtotal = 0.0;
CalculateCost15, subtotal,tax);
Cout << "The cost for 15 items is " << subtotal
<< ", and the tax for " << subtotal << " is " << tax << endl;
//end of fragment
Void calculateCostint count, float& subTotal, float taxCost)
{
If count < 10)
{
SubTotal = count * 0.50;
}
Else
{
SubTotal = count * 0.20;
}
TaxCost = 0.1 * subTotal;
}

A) The cost for 15 items is 3.00, and the tax for 3.00 is 0.30;
B) The cost for 15 items is 0.00, and the tax for 3.00 is 0.00;
C) The cost for 15 items is 0.00, and the tax for 3.00 is 0.30;
D) The cost for 15 items is 3.00, and the tax for 3.00 is 0.00;

Question 35

Using functions in a program is called _____________.

Question 36

Which of the following are true?

A) a function can call another function.
B) as long as the function is defined anywhere in your program, it can be used anywhere else.
C) a function definition can contain another function definition.
D) if you have function prototypes, the order in which you define your functions is important.

Question 37

Which of the following is a legal call to the displayOutput function?
Void displayOutputint total);

A) void displayOutputmyTotal);
B) displayOutputint mytotal);
C) displayOutputmyTotal);
D) cout << displayOutputmyTotal);

Question 38

What is wrong with the following function body?
Void calculateint count, float price, float& cost)
{
If count < 0)
Cost=0.0;
Else
Cost=count*price;
Return;
}

A) void functions may not have a return statement.
B) void functions must return a value
C) nothing
D) can not mix reference and value parameters

Question 39

A ________ is a simplified version of a function used to test the main program.

Question 40

What is the value of choice after the following statements?
Void getChoiceint& par_choice, in par_count);
Int choice, count=3;
GetChoicechoice, count);
Void getChoiceint& par_choice, in par_count)
{
Ifpar_count<0)
Par_choice =0;
Ifpar_count = 0)
Par_choice=-1;
Else
Par_choice=99;
Return;
}

A) 3
B) 0
C) -1
D) 99

Question 41

If a function needs to modify more than one variable, it must

A) be pass by value
B) be a void function
C) return all values needed
D) be a call by reference function

Question 42

Which of the following comments would be the best post-condition for this swap function void swap int& left, int&right);

A) //Postcondition: None
B) //Postcondition: the values of left and right are exchanged.
C) //Postcondition: left has the value of right
D) //Postcondition: left and right are unchanged

Question 43

When a void function is called, it is known as

A) An output function.
B) A returned value.
C) An executable statement.
D) A comment

Question 44

Given the following function definitions and program fragments, what is the output?
Void f1int& z, int &q)
{
Int temp;
Temp=q;
Q=z;
Z=temp;
}
Void f2 int& a, int& b)
{
If aF1a,b);
Else
A=b;
}
Int x=3, y=4;
F2y,x);
Cout << x <<" " << y << endl;

A) 3 3
B) 4 3
C) 3 4
D) 4 4

Question 45

What is the output of the following code fragments?
Int trial int& a, int b)
{
Ifb > a)
{
A=b;
Return -a;
}
Else
{
Return 0;
}
}
Float x=0, y=10,z;
Z=trialy,x);
Cout << z << " " << x <<" " << y << endl;

A) -10 0 0
B) 0 10 0
C) 10 0 0
D) 0 0 10

Question 46

Testing your program should be done

A) As each function is developed
B) At the end of the coding
C) Only if there appear to be problems
D) Only if your instructor requires it.

Question 47

A simplified version of a function which is used to test the main program is called

A) A stub
B) Abstraction
C) Polymorphism
D) A driver

Question 48

Given the following function declaration and local variable declarations, which of the following is not a correct function call?
Int myInt;
Float myFloat;
Char ch;
Void someFunctionint& first, float second, char third);

A) someFunction1, 2.0, ch);
B) someFunctionmyInt, myFloat, ch);
C) someFunctionmyInt, 2.0, 'c');
D) someFunctionmyInt, myFloat, '1');

Question 49

A simplified main program used to test functions is called

A) A stub
B) Abstraction
C) Polymorphism
D) A driver

Question 50

In the following function, what is passed to the first parameter?
Void f1 int& value1, int value2);
Int x,y;
F1x,y);

A) The value of x
B) nothing, it is a void function
C) the value of y
D) the variable x or its memory location)

Question 51

Testing a function or program using test values that are at or near the values that change the outcome of the program is known as using

A) parameters
B) functional decomposition
C) boundary values
D) a black-box

Question 52

Given the following function definition
Void shiftint& a, int&b)
{
A=b;
B=a;
}
What is the output after the following function call?
Int first=0, second=10;
Shiftfirst, second);
Cout << first <<" "<< second << endl;

A) 0 10
B) 10 0
C) 0 0
D) 10 10

Question 53

Call-by-reference should be used

A) For all variables
B) When the function needs to change the value of one or more arguments
C) Never
D) only in void functions

Question 54

If you write a function that should use call-by-reference, but forget to include the ampersand,

A) The program will not compile
B) The program will not link
C) The program will not run without a run-time error
D) The program will run with incorrect results
E) It doesn't matter