Deck 1: C++ Basics

Question 1

C++ uses only /* */ for comments.

Answer 1

False

Question 2

A program should have a comment on every line.

Answer 2

False

Question 3

The most difficult programming language construct to learn to use properly is the comment.

Answer 3

True

Question 4

To put a character into a cstring constant that causes the output to continue on the next line,insert the escape sequence \t into the string constant.

Question 5

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

Question 6

A computer program is a set of instructions intended for only the computer to follow.

Question 7

C++ not only supports OOP but also supports other programming styles.

Question 8

A program's comments should connect the program code to the problem being solved.

Question 9

The names x,y,and z are satisfactory variable names for the lengths of the legs and hypotenuse of a triangle.

Question 10

If we execute this code in an otherwise correct and complete program:
n = 1;
n = (n++)+ (n++);
the value of n is guaranteed to be 3 after the second line executes.

Question 11

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

Question 12

The namespace facility is a tool used that assists in the study of genealogy.

Question 13

OOP is an acronym that means Object Oriented Programming.

Question 14

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

Question 15

Comments have no value whatsoever and do not belong in a program.

Question 16

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

Question 17

A C++ declaration is a definition that also allocates storage for an identifier's value (or function's body etc. ).

Question 18

The range of values for an int variable is from about 0 to +2 billion.

Question 19

If we execute the code fragment in an otherwise complete,correct program:
n = 1;
cout << n++ << " " << n++ << " " << n++ << endl;
the output is guaranteed to be 1 2 3.

Question 20

A C++ declaration introduces only an identifier's spelling and specifies its type.

Question 21

When you use a double,what is doubled? When you use a long int,how much longer is the long int than an int? Comment.

Question 22

Give the declaration for two variables,feet and inches.Declare each to be of type int,and both initialized to zero in the declaration.Give both initialization alternatives.

Question 23

In C++,a legal identifiers may contain these kinds of characters _______________,______________,______________

Question 24

Which of the following are likely to be poor choices for an identifier in a program? Why?
a)x
b)RATE
c)data
d)_abc
e)A

Question 25

Which of the following will properly encode the string "\w\\\t" into variable s?

A)s = "\w\\\t";
B)s = R"(\w\\\t)";
C)s = "\\w\\\\\\t";
D)s = "/w///t";

Question 26

What is the value assigned to the variable in each of these cases? Explain curious results.Be careful!
int x,y;
a)x = 1/2;
b)y = 3.0/2.0;
double z,w,t;
c)z = 1/2;
d)w = 3/2;
e)t = 3.0/2.0;

Question 27

An r-value is

A)an expression that can be only placed on the right of any operator such as +,*,/ etc.
B)can never be assigned a value
C)can have a value fetched from it
D)is designed for use by a right-handed person.

Question 28

Write a C++ program that outputs "My first C++ program" and then outputs a carriage return.

Question 29

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;

A)int
B)double
C)auto
D)syntax error

Question 30

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

Question 31

What is the difference between a warning from the compiler and an error message from the compiler?

Question 32

What does the line
#include
do for your program?

Question 33

Identifiers should at least give a hint to the human reader of the ________________ of the identifier in the context of the problem being solved.

Question 34

In the history of the C++ language,what was the immediate predecessor of the C++ language? How is this older language related to C++?

Question 35

Write a short program that contains statements to output the values of a variable that you define but neither initialize nor assign.Discuss the output you get.

Question 36

The C++ very nearly contains the ______ programming language as proper subset.

Question 37

With C++11 and higher what data type can you use to guarantee that 32 bits will be used to store a signed integer?