Deck 6: User-Defined Function

Question 1

A variable listed in a header is known as a(n) ____ parameter.

A) actual
B) local
C) formal
D) function

Answer 1

C

Question 2

The data type of a variable in a return statement must match the function type.

Answer 2

True

Question 3

The output of the statement: cout << pow(3.0, 2.0) + 5 << endl; is ____.

A) 11.0
B) 12.0
C) 13.0
D) 14.0

Answer 3

D

Question 4

The output of the statement: cout << pow(2.0, pow(3.0, 1.0)) << endl;
Is ____.

A) 6.0
B) 7.0
C) 8.0
D) 9.0

Question 5

If the formal parameter list of a function is empty, the parentheses after the function name are not needed.

Question 6

To use the predefined function tolower, the program must include the header file ____.

A)
B)
C)
D)

Question 7

The following function heading in a C++ program is valid:
int funcExp(int u, char v, float g)

Question 8

Functions that do not have a return type are called ____ functions.

A) zero
B) null
C) void
D) empty

Question 9

Assume the following. ​
​
The output of the statement:
​
Cout << static_cast(tolower('B')) << endl;
​
Is ____.

A) 65
B) 67
C) 96
D) 98

Question 10

Once you write and properly debug a function, you can use it in the program (or different programs) again and again without having to rewrite the same code repeatedly.

Question 11

The heading of the function is also called the ____.

A) title
B) function signature
C) function head
D) function header

Question 12

Using functions greatly enhances a program's readability because it reduces the complexity of the function main.

Question 13

The following return statement returns the value 10.
return 10, 16;

Question 14

In C++, a function prototype is the function heading without the body of the function.

Question 15

A variable or expression listed in a call to a function is called the ____.

A) formal parameter
B) actual parameter
C) data type
D) type of the function

Question 16

Assume that all variables are properly declared. The following statement in a value-returning function is legal.

Question 17

The execution of a return statement in a user-defined function terminates the program.

Question 18

The function main is always compiled first, regardless of where in the program the function main is placed.

Question 19

The output of the statement: cout << tolower('$') << endl;
Is ____.

A) '$'
B) '0'
C) '1'
D) An error, because you cannot use tolower with '$'.

Question 20

The standard header file for the abs(x)function is ____.

A)
B)
C)
D)

Question 21

Given the following function: what is the output of the following statement?
Cout << next(next(5)) << endl;

A) 5
B) 6
C) 7
D) 8

Question 22

Which of the following function prototypes is valid?

A) int funcTest(int x, int y, float z){}
B) funcTest(int x, int y, float){};
C) int funcTest(int, int y, float z)
D) int funcTest(int, int, float);

Question 23

What value is returned by the following return statement?

A) 0
B) 5
C) 6
D) 7

Question 24

Given the function prototype: float test(int, int, int);
Which of the following statements is legal?

A) cout << test(7, test(14, 23));
B) cout << test(test(7, 14), 23);
C) cout << test(14, 23);
D) cout << test(7, 14, 23);

Question 25

Stream variables (for example, ifstream and ofstream) should be passed by ____________________ to a function.

Question 26

Which of the following function prototypes is valid?

A) int funcExp(int x, float v);
B) funcExp(int x, float v){};
C) funcExp(void);
D) int funcExp(x);

Question 27

Given the following function: what is the output of the following statement?
Cout << strange(4, 5) << endl;

A) -1
B) 1
C) 9
D) 20

Question 28

If a function needs to return more than one value, as a rule of good programming style, you should change it to a(n) ____________________ function and use the appropriate reference parameters to return the values.

Question 29

Given the following function prototype: ​
Int myFunc(int, int);
​
Which of the following statements is valid? Assume that all variables are properly declared.

A) cin >> myFunc(y);
B) cout << myFunc(myFunc(7, 8), 15);
C) cin >> myFunc('2', '3');
D) cout << myFunc(myFunc(7), 15);

Question 30

A function prototype is ____.

A) a definition, but not a declaration
B) a declaration and a definition
C) a declaration, but not a definition
D) a comment line

Question 31

____________________ parameters are useful in three situations:
• When the value of the actual parameter needs to be changed
• When you want to return more than one value from a function
• When passing the address would save memory space and time relative to copying a large amount of data

Question 32

Given the function prototype: ​
Double testAlpha(int u, char v, double t);
​
Which of the following statements is legal?

A) cout << testAlpha(5, 'A', 2);
B) cout << testAlpha( int 5, char 'A', int 2);
C) cout << testAlpha('5.0', 'A', '2.0');
D) cout << testAlpha(5.0, "65", 2.0);

Question 33

The statement: return 8, 10; returns the value ____.

A) 8
B) 10
C) 18
D) 80

Question 34

The statement: return 2 * 3 + 1, 1 + 5; returns the value ____.

A) 2
B) 3
C) 6
D) 7

Question 35

A function ____________________ is a function that is not fully coded.

Question 36

Given the following function prototype: ​
Double tryMe(double, double);
​
Which of the following statements is valid? Assume that all variables are properly declared.

A) cin >> tryMe(x);
B) cout << tryMe(2.0, 3.0);
C) cout << tryMe(tryMe(double, double), double);
D) cout << tryMe(tryMe(float, float), float);

Question 37

Given the following function prototype: ​
Int test(float, char);
​
Which of the following statements is valid?

A) cout << test(12, &);
B) cout << test("12.0", '&');
C) int u = test(5.0, '*');
D) cout << test('12', '&');

Question 38

When you attach & after the dataType in the formal parameter list of a function, the variable following that dataType becomes a(n) ____________________ parameter.

Question 39

The statement: return 37, y, 2 * 3; returns the value ____.

A) 2
B) 3
C) y
D) 6

Question 40

Which statement below about prototypes and headers is true?

A) Parameter names must be listed in the prototype, but not necessarily in the header.
B) Prototypes end with a semicolon, but headers do not.
C) Headers should come before prototypes.
D) Headers end with a semicolon, but prototypes do not.

Question 41

The ____________________ of a function consists of the function name and its formal parameter list.