Day 6

Question 1

What is a class?

Answer 1

A blueprint written by a programmer to define what actions an object can perform

Question 2

What is an object?

Answer 2

an instance of the class when the program is running

Question 3

Constructor

Answer 3

called to initialize class data
same name as class
no parameters

Question 4

Destructor

Answer 4

• if you see a banana peel ~ you know its a destructor

- uses free memory when the object leaves scope or with the delete keyword

Question 5

Private

Answer 5

• keyword describes section of info only used by class itself.
• by default, all classes are private
• (private means private! - no one else can see it!!)

Question 6

Public

Answer 6

• keyword that describes info that can be accessed from outside of class
• like free wifi at starbucks ;P

Question 7

behavior

Answer 7

• function declared inside class body.
• manipulate private class variables
• *it’s a behavior to manipulate private parts **

Question 8

this

Answer 8

• if you see –> , the answer is THIS.
• indicates the object itself and cannot be accessed outside of the class code definition.
• commonly used with characteristics and methods

Question 9

Getters

Setters

Answer 9

-keyword is retrieve for getters and assign for setters

they retrieve/assign values to private characteristics

Question 10

What file contains the 2 classes to perform input and output?

Answer 10

include

Question 11

Input file stream

Answer 11

std::ifstream
its a class
question will likely ask for a “stream”
this is used when READING data from the file

be careful not to confuse this with fstream, read slowly on test

Question 12

Output file stream

Answer 12

std::ofstream
it’s a class
used when WRITING or appending data

Question 13

file mode : write mode

Answer 13

std::ios::out
truncates contents of existing file
DEFAULT ofstream

Question 14

file mode: Append

Answer 14

std::ios::app

append to the end of the file if it already exists

Question 15

file mode: Read mode

Answer 15

std::ios::in
cannot change contents of the file
DEFAULT for ifstream

Question 16

file mode: read/write

Answer 16

std::ios::binary

read/write file as a stream of 0s and 1s rather than as text

Question 17

What do file modes do?

Answer 17

specify file pointer positions that change the postion of data access in a file.

Question 18

File output

Answer 18

ability to write data to a file

syntax: ofstream outfile;

Question 19

How do you test if the file opened correctly?

Answer 19

open()

Question 20

What do you do when the file is no longer necessary to free resources?

Answer 20

close()

Question 21

File input

Answer 21

ability to read data from a file.
getline will ALWAYS BE INPUT!!!!!
syntax: ifstream infile;