3- variables, identifiers, assignment, input/output

Question 1

Variable

Answer 1

a named memory location

Question 2

Variable value

Answer 2

data stored in variable
variable always has a value

Question 3

Identifiers

Answer 3

name of a variable or any other named construct

Question 4

Identifier naming conventions

Answer 4

identifier must start with a letter or underscore symbol (_), the rest of the characters should be letters, digits or underscores

Question 5

Snake Case

Answer 5

terse, use abbreviations and underscores to separate the words, never use capital letters for variables

min
temperature
camera_angle
cur_point_nmbr

Question 6

Camel Case

Answer 6

if multiple words: capitalize, do not use underscores
variant: first letter lowercased

1:
Min
Temperature
CameraAngle
CurrentNumberPoints

2:
min
temperature
cameraAngle
currentNumberPoints

Question 7

Keywords

Answer 7

identifiers reserved as part of the language
int, return, float, double
cannot be used by the programmer to name constructs
consist of lowercase letters only
have special meaning to the compiler

Question 8

Declaration

Answer 8

introduction of the name to the compiler
before use, every variable in C++ program needs to be declared
example declarations:
int numberOfBars;
double weight, totalWeight;

Question 9

Type

Answer 9

the kind of data stored in a variable

Question 10

Assignment statement

Answer 10

an order to the computer to set the value of the variable on the left-hand side of equal sign to the value of the right-hand side
example:
numberOfBars = 37;
totalWeight = oneWeight;
totalWeight = oneWeight * numberOfBars;
numberOfBars = numberOfBars + 3;

Question 11

Stream

Answer 11

a sequence of data to be processed

Question 12

Input stream

Answer 12

data to be input into program

Question 13

Output stream

Answer 13

data generated by the program to be output

Question 14

«

Answer 14

is insertion operator, it inserts data into the output stream

Question 15

> >

Answer 15

extraction operator

Question 16

cout

Answer 16

variable values as well as strings of text can be output to the screen using cout (Console OUTput) stream

Question 17

endl

Answer 17

tells the output from the next line

Question 18

\n

Answer 18

at the end of the string serves the same purpose as endl

Question 19

cin

Answer 19

(Console INput) – stream used to give variables user-input values
need to add the following to the beginning of your program

Question 20

Dialog

Answer 20

collection of program prompts and user responses

Question 21

Input token

Answer 21

sequence of characters separated by white space (spaces, tabs, newlines)

Question 22

\t

Answer 22

horizontal tab

Question 23

\a

Answer 23

alert

Question 24

\

Answer 24

backslash

Question 25

"

Answer 25

double quote