Quiz 1

Question 1

double result = 15 / 6;

Given the assignment statement…. What is the value stored in result?

1. 2.0
2. 0
3. Nothing, an error occurs. The program will not compile.
4. 2.5

Answer 1

1. 2.0

Question 2

Recall that the slope formula is.... Assume the variable names y2, y1, x2, and x1` already exist in your program as integer values.

Which of the following assignment statements would correctly calculate the slope and store it in a floating-point variable called m?

1. double m = y2 – y1 / x2 – x1;
2. double m = static_cast<double>(y2 – y1) / (x2 – x1);
3. double m = static_cast<double>(y2 – y1) / x2 – x1;
4. double m = (y2 – y1) / (x2 – x1);

Answer 2

2. double m = static_cast<double>(y2 – y1) / (x2 – x1);

Question 3

Given the following information: a = 10 and b = 7.

Which of the following assignment statements will result in the variable answer containing the value true?

1. bool answer = a == 12 && b > 7;
2. bool answer = a == 12 || b >= 7;
3. bool answer = a == 12 || b > 7;
4. bool answer = a == 12 && b >= 7;

Answer 3

2. bool answer = a == 12 || b >= 7;

Question 4

Assume the following x = 5, y = 6, and z = 8. What is the result of the Boolean Expression: 7 <= x && z > 4?

1. true
2. false

Answer 4

2. false

Question 5

Assume all variables have been declared properly and all includes are there.

The following is a valid assignment statement: sqrt(b * b + c * c) = a;

1. true
2. false

Answer 5

2. false

Question 6

Assume the following, x = 5, y = 6, and z = 8. What is the result of the Boolean Expression: x != 5 || x <= y

1. true
2. false

Answer 6

1. true

Question 7

Which header file would we need to include to gain access to tools that let us format our output in C++ ?

Answer 7

iomanip

Question 8

Which of the following statements will correctly set the cout buffer to always display 3 decimal places?

1. std::fixed; std::setprecision(3);
2. std::cout << std::fixed;
3. std::cout << std::setprecision(3);
4. std::cout << std::fixed << std::setprecision(3);

Answer 8

4. std::cout << std::fixed << std::setprecision(3);

Question 9

A variable declared as const should be initialized to a value because you cannot change it later in the program.

1. True
2. False

Answer 9

1. True

Question 10

Which header file would we need to include to gain access to cout and cin?

Answer 10

iostream

Question 11

Which header file would we need to include to gain access to useful mathematical functions in C++?

Answer 11

cmath

Question 12

What is the name and operator used to send get input from cin?

Answer 12

Extraction Operator >>

Question 13

The \_\_\_\_\_\_\_\_ marks the beginning of a single line comment in C++.

Answer 13

\\

Question 14

Which of the following data types uses the most memory?

1. int
2. float
3. char
4. double

Answer 14

4. double

Question 15

C++ is a(n) \_\_\_\_\_\_\_\_\_\_\_\_\_ language.

Answer 15

Compiled/compiler

Question 16

A byte consists of how many bits?

Answer 16

8

Question 17

The \_\_\_\_\_\_\_\_\_ marks the beginning of a preprocessor directive in C++.

Answer 17

#

Question 18

Which operator gives the remainder?

Answer 18

%

Question 19

An integer divided by an integer in C++ always results in a floating point result. True or false?

Answer 19

False. It will store an integer result.

Question 20

An assignment statement always stores the result of the expression on the right hand side of the = in the variable on the left hand side. True or false?

Answer 20

True.

Question 21

cin << var;

Assuming the variable var exists and has been properly declared, the statement would try to read a value in and store it in the variable var. True or false?

Answer 21

False. The operator << is incorrect, and it should be >>

Question 22

Which of the following data types uses the least memory?

1. double
2. int
3. char
4. float

Answer 22

char

Question 23

Every C++ program must have a \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_?

Answer 23

main function

Question 24

A variable must be declared before it is used. True or false?

Answer 24

True.

Question 25

A set of well-defined logical steps is referred to as a(n) \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ in programming.

Answer 25

Algorithm

Question 26

What is the name and operator used to send output to cout?

Answer 26

Insertion Operator <<

Question 27

The variable name 3rd_number is a valid variable name. True or false?

Answer 27

False. It cannot begin with a number.