Chapter 3

Question 1

Variables

Answer 1

An internal place where the computer temporarily stores data..contents can change as the program is running

Question 2

Every Variable has a data type, ….?

Answer 2

name, scope, and lifetime.

Question 3

The variable data type determines….?

Answer 3

the type of data the variable can store.

Question 4

Each data type is a __________?

Answer 4

Class..which means that each data type is a pattern from which one or more objects are created.

Question 5

Data Type: Boolean-Stores?

Answer 5

A logical value, true or false

Question 6

Data Type: Char-Stores?

Answer 6

One Unicode character

Question 7

Data Type: Date-Stores?

Answer 7

date and time info
date range: January 1, 0001 to December 31, 9999
time range: 0:00:00 midnight to 23:59:59

Question 8

Data Type: Decimal-Stores?

Answer 8

a number with a decimal place

+/- -7.982342343453264564364363234

Question 9

Data Type: Double-Stores?

Answer 9

a number with a decimal place

+/- -1.79442665463464636

Question 10

Data Type: Integer-Stores?

Answer 10

integer

-2 kabillion

Question 11

Data Type: Long-Stores?

Answer 11

integer

-9 kabillion to +9 kabillion

Question 12

Data Type: Object-Stores

Answer 12

data of any type

Question 13

Data Type: Short-Stores

Answer 13

integer

range -32,768 to 32,767

Question 14

Data Type: Single-Stores?

Answer 14

a number with a decimal place

Question 15

Data Type: String-String?

Answer 15

text; 0 to 2 billion characters

Question 16

These data types store whole numbers

Answer 16

Integer: -2 billion to 2 billion
Long: -9 kabillion to +9 kabillion
Short: -32, 768 to 32, 767

Question 17

These data types store numbers with decimal places

Answer 17

Decimal is largest and used for money
Double (first two most commonly used)
Single

Question 18

This data is the most general and most taxing on computer

Answer 18

Object data type

Question 19

Most common data type used for whole numbers

Answer 19

Integer, even if short works

Question 20

A variables name is also called an _______?

Answer 20

Identifier: Describes the contents of the variable

Question 21

Boolean ID = ?

Answer 21

bln

Question 22

Decimal ID = ?

Answer 22

dec

Question 23

Double ID = ?

Answer 23

dbl

Question 24

Integer ID = ?

Answer 24

int

Question 25

String ID = ?

Answer 25

str

Question 26

Variable Declaration Statement

Answer 26

Dim/Private/Static variableName As dataType [= initial value] Ex. Dim intNumSold As Integer Dim blnInsured As Boolean = True

Question 27

A variable is an object? T/F

Answer 27

True

Question 28

A variable is an instance of the class specified in the dataType info? T/F

Answer 28

True

Question 29

Literal Constant

Answer 29

item of data whose value does not change while the application is runing

Question 30

Syntax for assigning a value to a variable?

Answer 30

``` variableName = expression intNumber = 25 ```

Question 31

The TryParse method converts a __________ to a number?

Answer 31

String

Question 32

Explain what this does: | Double.TryParse(txtDue.Text, dblDue)

Answer 32

If the string contained in the txtDue controls's Text property can be converted to a Double number, the TryParse method converts the string and then stores the result in the dblDue variable, otherwise, it stores the number 0 in the variable

Question 33

Explain what this does: | decorate = Convert.ToDecimal(.15)

Answer 33

Converts the Double number .15 to decimal and then assigns the result to the decRate variable

Question 34

Explain what this does: | decBonus = decSales * Convert.ToDecimal(.05)

Answer 34

Converts the double number .05 to decimal, multiplies it by the contents of the decSales variable and assigns it to the decBonus variable

Question 35

A variable's scope indicates where the variable can be ____________ in an applications code.

Answer 35

used

Question 36

A variable's lifetime indicates how _________ the variable remains in the computers internal memory

Answer 36

long

Question 37

Procedure level variable are designated with the keyword ________?

Answer 37

Dim

Question 38

Class-Level Variables are designated with the keyword ___________?

Answer 38

Private

Question 39

Const intLIMIT As Integer = 70 means what?

Answer 39

Declares intLIMIT as an Integer named constant and initializes it to the integer 70... it is all uppercase to distinguish between a variable

Question 40

Class Scope

Answer 40

a variable that can used by any procedure within the form

Question 41

Convert Class

Answer 41

contains methods that return the result of converting a value to a specified data type

Question 42

Forms Declaration Section

Answer 42

Located between the public class and end class clauses

Question 43

Implicit type conversion

Answer 43

process by which a value is automatically converted to fit the memory location to which it is assinged

Question 44

Literal Constant

Answer 44

an item of data whose value does not change during run time

Question 45

literal type character

Answer 45

a character such as the letter d, appended to a literal constant for the purpose of forcing the literal constant to assume a different data type such as decimal