CS150 Module 1-3 Review

Before a variable in C++ is used, it must be ---------

defined

What is the data type of variable x in the following C++11 code? int y= 2; double z = 3.5; auto x = z * y;

double

There may be more than one correct answer. You must give all correct answers for full credit. Pick the C++ reserved words out of the following list.

double while if

A program should have a comment on every line.

false

What is the value assigned to the variable in each of these cases? Explain curious results. Be careful! int x, y; x = 1/2; y = 3.0/2.0;

x=0 and y=1

What is the value assigned to the variable in each of these cases? Explain curious results. Be careful! double z, w, t; z = 1/2; w = 3/2; t = 3.0/2.0;

z=0.0, w=1.0, and t=1.5

To use cin and cout, the program must include the header file iostream and either include the statement using namespace std; or refer to these identifiers as std::cin and std::cout.

true

The program that loads first when you turn on your computer is called the operating system.

true

The value of the expression 20.0 * (9/5) + 32.0 is ----------

52.0

The value of the expression 20.0 * (9.0/5) + 32.0 is -----------

68.0

Given the C++ output statements. What is the output of these lines of code? cout << "If you have "; cout << "a number of pods "; cout << "you can quit.";

Given the C++ output statements. What is the output of these lines of code? cout << "If you have "; cout << "a number of pods "; cout << "you can quit.";

In C++ the compiler will infer the type intended for a variable from the context in which the variable occurs.

false

In C++ the variables Alpha, ALPHA and AlphA are the same identifier.

false

The number system used by a computer is base 10.

false

There may be more than one correct answer. You must give all correct answers for full credit. In C++, a legal identifiers may contain these kinds of characters _______________, ______________, ______________

letters digits underscore

Which of the following types are not built into the C++ language?

real

There may be more than one correct answer. You must give all correct answers for full credit. Which of the following names might give the human reader some hint about the data that is stored in them?

speed, distance, time voltage, current, resistance

During program execution, the contents of a named constant cannot be changed.

true

In C++ you can assign an expression of type int to a variable of type double with no problem.

true

OOP is an acronym that means Object Oriented Programming.

true