True/False
Indicate whether the
statement is true or false.
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1.
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A C++ program cannot contain more than one function.
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2.
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Functions allow the programmer to avoid duplicating code in different parts of a
program.
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3.
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Functions allow large and complex programs to be broken into small and
manageable tasks.
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4.
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A value-returning function can return multiple values after completing its
assigned task, using a multi-valued return statement.
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5.
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A pseudo-random number generator is a device that produces a sequence of numbers
that meet certain statistical requirements for randomness.
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6.
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The rand() function returns an integer that is
greater than or equal to zero but less than or equal to the value stored in the RAND_LIMIT constant.
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7.
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The statement cout << 1 + rand() % (6 – 1
+ 1); displays a random integer from 0 through 6 on the screen.
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8.
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You should initialize the random number generator in each program in which it is
used; otherwise, it will generate the same series of numbers each time the program is
executed.
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9.
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When generating pseudo-random numbers, a seed is an integer that represents the
starting point for the random number generator.
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10.
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The time( ) function is a value-returning function
that returns the current time (according to your computer system’s clock) as seconds elapsed
since midnight on January 1, 1960.
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11.
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A function header is considered a statement in C++.
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12.
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It is common practice to begin the name of a function with a noun.
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13.
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The rules for naming functions are the same as for naming variables.
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14.
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Each variable you declare in a program has both a value and a unique address
that represents the location of the variable in the computer’s internal memory.
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15.
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Passing a variable’s value to a function is referred to as passing by
reference.
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16.
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Passing a variable’s address to a function is referred to as passing by
value.
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17.
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Unless you specify otherwise, variables in C++ are automatically passed by
value.
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18.
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When you pass a literal constant, a keyword, a named constant, or a
variable’s value to a function, the function stores the value it receives in a memory
location
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19.
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The data type and position of each formal parameter in the parameterList
of a function call must agree with the data type and position of its corresponding actual
argument.
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20.
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In C++, you can define a default value
for one or more of a function’s formal parameters.
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21.
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Few C++ programmers enter the function definitions below the main() function in a program.
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22.
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You must include the name of each formal parameter in the function
prototype.
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23.
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You call a program-defined function in exactly the same way as you call a
built-in function.
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24.
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The scope and lifetime of a variable are typically determined by where you
declare the variable in the program.
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25.
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Declaring a variable as global rather than local allows unintentional errors to
occur when a function that should not have access to the variable inadvertently changes the
variable’s contents.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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26.
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A(n) ____ is a block of code that performs a task.
a. | statement | c. | function | b. | expression | d. | program |
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27.
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Every C++ program contains at least one function: ____.
a. | main() | c. | return() | b. | pow() | d. | rand() |
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28.
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____ functions do not return a value.
a. | Empty | c. | Null | b. | Void | d. | Abstract |
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29.
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You can use the built-in C++ ____ function to raise a number to a power and then
return the result as a double number.
a. | xy() | c. | power() | b. | raise() | d. | pow() |
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30.
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The statement cout << pow(100, .5); displays
the number ____ on the screen.
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31.
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In standard C++, the random number generator is a built-in function named
____.
a. | rand() | c. | rnd() | b. | random() | d. | rndm() |
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32.
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Although the value of RAND_MAX varies with different
systems, its value is always at least ____.
a. | 8,191 | c. | 32,767 | b. | 16,382 | d. | 65,534 |
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33.
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In .NET C++, you use the ____ class to generate random numbers.
a. | Math | c. | Random | b. | Rand | d. | Util |
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34.
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The modulus arithmetic operator (____) divides two integers and results in the
remainder of the division.
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35.
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The statement num = 10 + rand() % (100 – 10 +
1); assigns 53 to the num variable if the value returned by rand() is ____.
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36.
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You initialize the random number generator using the ____ function.
a. | srand() | c. | init() | b. | seed() | d. | start() |
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37.
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The ____ function is a void function.
a. | rand() | c. | toupper() | b. | srand() | d. | main() |
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38.
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To use the time() function in a program, the program
must contain the ____ directive.
a. | #include <time> | c. | #include
<rand> | b. | #include
<ctime> | d. | #include <crand> |
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39.
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The ____ store the information passed to the function when the function is
invoked.
a. | actual parameters | c. | actual arguments | b. | formal parameters | d. | formal
arguments |
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40.
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The items of information you pass to a function are called ____.
a. | actual parameters | c. | actual arguments | b. | formal parameters | d. | formal
arguments |
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41.
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An actual argument can be a variable, named constant, literal constant, or
keyword; however, in most cases it will be a ____.
a. | variable | c. | literal constant | b. | named constant | d. | keyword |
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42.
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The ____ contains the instructions the function must follow to perform its
assigned task.
a. | function header | c. | formal parameters list | b. | function
body | d. | actual arguments
list |
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43.
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The function body begins with ____.
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44.
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The ____ alerts the computer that the function has completed its task.
a. | ) | c. | exit statement | b. | quit statement | d. | return statement |
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45.
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When a function definition appears below the main()
function, you must enter a function ____ above the main() function.
a. | prototype | c. | argument | b. | parameter | d. | declaration |
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46.
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A variable’s ____ indicates where in the program the variable can be
used.
a. | limit | c. | scope | b. | span | d. | lifetime |
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47.
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A variable’s ____ indicates how long the variable remains in the
computer’s internal memory.
a. | limit | c. | scope | b. | span | d. | lifetime |
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48.
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The scope of a variable can be either ____.
a. | local or global | c. | real or virtual | b. | small or large | d. | internal or
external |
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49.
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____ variables are declared outside of any function in the program, and they
remain in memory until the program ends.
a. | Global | c. | External | b. | Local | d. | Internal |
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50.
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____ variables can be used only by the function in which they are declared or in
whose parameterList they appear.
a. | Global | c. | External | b. | Local | d. | Internal |
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