Quiz & Exam Review (#2) - previous deck disappeared

Question 1

Which of the following casting expressions is recommended by the ANSI standard?

• intVar = (int)doubleVar;
• intVar = int(doubleVar);
• intVar = static_cast(doubleVar);
• intVar = (double)doubleVar;

Answer 1

intVar = static_cast(doubleVar);

Question 1

The values in an enumerated data type are actually stored as integers.

• True
• False

Answer 1

True

Question 2

What is the correct order of precedence of the logical (Boolean) operators?

• ||, !, &&
• &&, ||, !
• !, &&, ||
• &&, !, ||

Answer 2

!, &&, ||

Question 2

Opening a file is an operation that can fail, so you should test for that possibility.

• True
• False

Answer 2

True

Question 3

The rand() function automatically generates a different sequence of random values each time you run your program.

True
False

Answer 3

False

Question 3

Which two of the following can be used to make subsequent console output begin on a new line?

endl
cin
‘\t’
‘\n’

Answer 3

endl

and

‘\n’

Question 3

What order do the parts of a function header appear in?

• name, parameter list, return type
• name, return type, parameter list
• return type, name, parameter list
• parameter list, name, return type

Answer 3

return type, name, parameter list

Question 3

A vector’s “size” and “capacity” are two different things.

• True
• False

Answer 3

True

Question 4

include does what?

• prints “iostream”
• replaces occurences of “include” with “iostream”
• resets the cursor
• gives a program access to a library of input/output functions

Answer 4

gives a program access to a library of input/output functions

Question 5

RAM is a type of secondary storage.

• True
• False

Answer 5

False

Question 6

Which two of the following make up a CPU?

RAM
control unit
ROM
ALU

Answer 6

Control Unit

and

ALU

Question 6

A variable of which type is used to hold a true or false value?

• int
• char
• bool
• double

Answer 6

bool

Question 7

A set of well-defined steps for performing a task or solving a problem is a(n)

• input device
• statement
• compiler
• algorithm

Answer 7

algorithm

Question 8

What will be the output of the following line of code?

std::cout << 5 / 4 << std::endl;

• 1.25
• 0
• 1
• 0.8

Answer 8

1

Question 9

Which of the following statements is true?

• A local variable can have the same name as a global variable, but then it cannot be accessed, because when you use that name, it will refer to the global variable instead of the local variable.
• A local variable cannot have the same name as a global variable.
• A variable declared at the function level cannot have the same name as one of that function’s parameters, because they would have the same scope.

Answer 9

A variable declared at the function level cannot have the same name as one of that function’s parameters, because they would have the same scope.

Question 10

By default classes are passed to a function by reference.

• True
• False

Answer 10

False

Question 11

Which of the following is a valid vector declaration?

• double nums;
• vector(10);
• string words[10];
• vector data(10);

Answer 11

vector data(10);

Question 12

While loops are specifically designed for the case when you know at the beginning of the loop how many times it should repeat.

• True
• False

Answer 12

False

Question 12

If a variable is passed as a parameter to a function, the name used for that parameter within the function must match that of the variable.

• True
• False

Answer 12

False

Question 14

What would be the result of the following expression?

5 + 6 % 4

4
0
7
2

Answer 14

7

Question 16

Which of the following allows you to read in a multi-character string that contains whitespace?

• cin >> myString;
• myString = cin.ignore(‘\n’);
• getline(cin, myString);
• cin.get(myString);

Answer 16

getline(cin, myString);

Question 16

What would be the result of the following expression?

5 + 6 % 4

0
2
7
4

Answer 16

7

Question 17

Machine language is written as a sequence of 1s and 0s referred to as

ternary
decimal
high level language
binary

Answer 17

Binary

Question 18

You should avoid using global variables.

• True
• False

Answer 18

True

Question 19

n certain rare cases a class will be separated into two files, an interface file and an implementation file. * True * False

Answer 19

False

Question 21

What is cout used for? * declaring a variable * input from the console * output to the console * editing code

Answer 21

output to the console

Question 22

What does cin do? * displays output to the console * reads input from the console * formats output * declares a string variable

Answer 22

reads input from the console

Question 23

A constructor must have a return type of void. * True * False

Answer 23

False

Question 24

A named storage location in computer memory for holding a piece of data whose value can change is a * constant * reserved word * RAM * variable

Answer 24

variable

Question 25

Assuming x is 2, y is 7 and z is 5, which of the following relational expressions is true? * !(z == 2 || x \< 7) && (y != 3 || z \> 2) * x == z || y % z == x * x + y + z \< x + z * x + z == y && z == x - y

Answer 25

x == z || y % z == x

Question 26

The following code is meant to output whether a given number is even or odd. It compiles and runs without crashing, but it says that every number is odd. What line is the error in? (Hint: it would only take a single keystroke to fix it!) int num; std::cout \<\< "Please enter an integer." \<\< std::endl; std::cin \>\> num; int test = num % 2; if (test = 0) std::cout \<\< "your number is even" \<\< std::endl; else std::cout \<\< "your number is odd" \<\< std::endl; * else * if (test = 0) * std::cin \>\> num; * int test = num % 2;

Answer 26

if (test = 0)

Question 28

Which is true of the following nested loop? int total = 0; for (int i=0; i for (int j=0; j total = total + i + j; * It will increment i and j together. * It will run through all values of i while j is equal to 0, then all values of i again while j is equal to 1, then all values of i again while j is equal to 2. * It will run through all values of j while i is equal to 0, then all values of j again while i is equal to 1, then all values of j again while i is equal to 2.

Answer 28

It will run through all values of j while i is equal to 0, then all values of j again while i is equal to 1, then all values of j again while i is equal to 2.

Question 29

How many elements are allocated by the following array declaration? int myArray[15]; * 14, one less than the number used to declare the array * 15, the number entered in the declaration * 0, no elements are allocated until some values are initialized * 10, the default number of elements in an array

Answer 29

15, the number entered in the declaration

Question 31

Which of the following is not part of the CPU cycle? * fetch * execute * decode * display

Answer 31

Display

Question 32

What would be the result of the following code? int total = 0; for (int i=1; i != 10; i += 2) { total += i; } std::cout \<\< "total = " \<\< total \<\< std::endl; * It would print 25. * There would be a syntax error message. * It would print 20. * It's an infinite loop - I would have to stop the program myself.

Answer 32

It's an infinite loop - I would have to stop the program myself.

Question 33

Creating a file stream object and opening a file to be read are two separate operations. * True * False

Answer 33

True

Question 34

Each character is assigned a numeric code according to a system called ASCII. * True * False

Answer 34

True

Question 35

If you define any constructors for a class, the compiler will not automatically provide a default constructor. * True * False

Answer 35

True

Question 36

In C++ a single array may store different data types. * True * False

Answer 36

False

Question 38

Closing files is a formality that doesn't actually affect anything. * True * False

Answer 38

False

Question 39

What is the output of the following code? int nums[] = {1,2,3,4}; nums[2] = 7; for (int i=0; i std::cout \<\< nums[i] \<\< " "; std::cout \<\< std::endl; * 1 2 7 4 * 1 7 3 4 * 1 7 2 4 * 1 3 7 4

Answer 39

1 2 7 4

Question 41

A program that translates source code instructions into the appropriate machine language instructions is a(n) * source file * preprocessor * executable * compiler

Answer 41

Compiler

Question 42

An object's private member variables can be accessed by... * any member function of that object * any private function of any object * using the dot operator * using the scope resolution operator

Answer 42

any member function of that object

Question 43

You indicate that a function does not return a value by... * giving it a return type of "void". * giving a reference type as tthe return type. * leaving out the return type. * putting a "&" in front of the function name.

Answer 43

giving it a return type of "void".

Question 45

cin requires the user to press the [Enter] key after entering data. * True * False

Answer 45

True

Question 46

The name you give a class when you define it can then be used much like you would use the names of built-in types such as double and char. * True * False

Answer 46

True

Question 47

After the following line of code executes, what will be the value of num? num = 2 \< 3 ? 4 : 5; * 4 * 2 * 5 * 3

Answer 47

4

Question 48

An else gets matched up with the if statement closest to the beginning of the program that does not already have its own else. * True * False

Answer 48

False

Question 49

When a function has both required arguments and default arguments, the default arguments must be listed first in the function header (and prototype, if any). * True * False

Answer 49

False