Deck 6: User-Defined Functions

Question 1

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

A)
B)
C)
D)

Answer 1

A

Question 2

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

A)
B)
C)
D)

Answer 2

A

Question 3

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

Answer 3

True

Question 4

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

Question 5

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

Question 6

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 7

The heading of the function is also called the ____.

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

Question 8

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 9

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 10

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

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

Question 11

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

Question 12

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

Question 13

Assume the following. static_cast('a') = 97
Static_cast('A') = 65
The output of the statement:
Cout << static_cast(tolower('B')) << endl; is ____.

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

Question 14

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

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

Question 15

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

Question 16

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

Question 17

Assume that all variables are properly declared. The following statement in a value-returning function is legal.
if (x % 2 == 0)
return x;
else
return x + 1;

Question 18

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

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

Question 19

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

Question 20

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

Question 21

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

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

Question 22

Given the following function: int strange(int x, int y)
{
If (x > y)
Return x + y;
Else
Return x - y;
}
What is the output of the following statement?
Cout << strange(4, 5) << endl;

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

Question 23

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 24

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

Question 25

If a formal parameter is a nonconstant reference parameter, during a function call, its corresponding actual parameter must be a(n) ____________________.

Question 26

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 27

Given the following function: int next(int x)
{
Return (x + 1);
}
What is the output of the following statement?
Cout << next(next(5)) << endl;

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

Question 28

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

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

Question 29

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 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

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

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

Question 32

A(n) ____________________ parameter is a formal parameter that receives the location (memory address) of the corresponding actual parameter.

Question 33

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 34

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 35

____________________ 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 36

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 37

A(n) ____________________ parameter s a formal parameter that receives a copy of the content of the corresponding actual parameter.

Question 38

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 39

What value is returned by the following return statement? int x = 5;
Return x + 1;

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

Question 40

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 41

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

Question 42

The program that tests a function is called a(n) ____________________ program.

Question 43

In C++, :: is called the ____________________.

Question 44

A variable for which memory is allocated at block entry and deallocated at block exit is called a(n) ____________________ variable.

Question 45

____________________ identifiers are not accessible outside of the function (block).

Question 46

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

Question 47

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 48

The ____________________ of an identifier refers to where in the program an identifier is accessible (visible).

Question 49

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

Question 50

A variable for which memory remains allocated as long as the program executes is called a(n) ____________________ variable.