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

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

Answer 2

True

Question 3

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

Answer 3

True

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

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 6

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

Question 7

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 8

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 9

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

Question 10

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

Question 11

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 12

The heading of the function is also called the ____.

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

Question 13

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

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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

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

Question 18

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

A)
B)
C)
D)

Question 19

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 20

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

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

Question 21

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

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

Question 22

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

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

Question 23

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

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

Question 24

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 25

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 26

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 27

____________________ 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 28

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

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

Question 29

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

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

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

Question 32

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

Question 33

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

Question 34

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 35

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 36

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 37

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 38

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 39

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 40

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 41

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

Question 42

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

Question 43

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

Question 44

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 45

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

Question 46

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

Question 47

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

Question 48

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

Question 49

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

Question 50

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