Chp 2 _ Data Processing AI

Question 1

Define the information systems process

Answer 1

Input → CPU processing → Output of data as useful information

Question 2

Name the types of data used in programming

Answer 2

Numeric, string, char, bool, decimal

Question 3

How do you declare a variable?

Answer 3

DataType VariableName;

Question 4

What rules apply to variable naming?

Answer 4

First char letter/underscore; no spaces; no keywords

Question 5

What is required to read inputs and format outputs?

Answer 5

Use appropriate controls and ToString/Parse methods

Question 6

How do you convert data types when reading input?

Answer 6

Use Parse methods like int.Parse or Convert.ToX

Question 7

Which operators perform calculations?

Answer 7

Arithmetic operators: +, -, *, /, %

Question 8

What is data processing?

Answer 8

Reading, storing, and processing data during program execution

Question 9

Give examples of input devices

Answer 9

Keyboard and mouse

Question 10

What is “process” in information systems?

Answer 10

CPU operations on entered data

Question 11

What is output in information systems?

Answer 11

Results presented as useful information

Question 12

What is a TextBox control?

Answer 12

Rectangular area for keyboard input

Question 13

Where is TextBox found in Toolbox?

Answer 13

Common Controls group

Question 14

How do you add a TextBox to a form?

Answer 14

Double-click it in the toolbox

Question 15

What is the default TextBox name?

Answer 15

textBoxn (n = 1,2,…)

Question 16

What does TextBox.Text store?

Answer 16

User input as a string

Question 17

How to assign “Hello” to TextBox?

Answer 17

textBox1.Text = “Hello”;

Question 18

How to clear a TextBox?

Answer 18

textBox1.Text = “”;

Question 19

What is a variable?

Answer 19

A memory storage location

Question 20

What represents a variable’s memory location?

Answer 20

Its variable name

Question 21

What must you do before using a variable in C#?

Answer 21

Declare it with a data type

Question 22

Syntax to declare a variable?

Answer 22

DataType VariableName;

Question 23

Why must variables have data types?

Answer 23

Defines the type of data they can hold

Question 24

What do primitive data types store?

Answer 24

Fundamental types like strings and integers

Question 25

Give examples of C# numeric data types

Answer 25

int, float, double

Question 26

What data type holds text?

Answer 26

string

Question 27

What data type holds one character?

Answer 27

char

Question 28

What data type holds true/false?

Answer 28

bool

Question 29

Valid first characters for names?

Answer 29

Letter or underscore

Question 30

Can names contain spaces?

Answer 30

No

Question 31

Use of C# keywords as names?

Answer 31

Not allowed

Question 32

Best practice for naming variables?

Answer 32

Choose meaningful names

Question 33

What does a string hold?

Answer 33

Any combination of characters

Question 34

How to assign a string value?

Answer 34

Use quotes: var = "Text";

Question 35

How to set a Label’s text?

Answer 35

productLabel.Text = productDescription;

Question 36

How to show a string in a MessageBox?

Answer 36

MessageBox.Show(productDescription);

Question 37

What is string concatenation?

Answer 37

Appending one string to another

Question 38

Which operator concatenates strings in C#?

Answer 38

+

Question 39

When must you declare variables?

Answer 39

Before using them

Question 40

How do you assign to a declared variable?

Answer 40

Use the = operator

Question 41

What is a local variable?

Answer 41

Declared inside and scoped to its method

Question 42

Define variable scope

Answer 42

Program region where variable is accessible

Question 43

Define variable lifetime

Answer 43

Time variable exists in memory during execution

Question 44

Can a local variable be accessed outside its method?

Answer 44

No

Question 45

When can you assign a value to a variable?

Answer 45

If type matches variable’s data type

Question 46

How many values can a variable hold?

Answer 46

One at a time

Question 47

Must you initialize a variable before use in C#?

Answer 47

Yes

Question 48

How to declare multiple same-type variables?

Answer 48

Type var1, var2, var3;

Question 49

Which types for math operations?

Answer 49

Numeric types like int, double

Question 50

What is int’s value range?

Answer 50

-2,147,483,648 to 2,147,483,647

Question 51

Which type stores fractional numbers?

Answer 51

double

Question 52

What is a numeric literal?

Answer 52

Number in code without quotes

Question 53

What is the decimal type?

Answer 53

128-bit high-precision numeric type

Question 54

Where is decimal commonly used?

Answer 54

Financial and monetary calculations

Question 55

What suffix for decimal literals?

Answer 55

M or m

Question 56

What is explicit conversion?

Answer 56

Type casting

Question 57

Cast decimal to int?

Answer 57

(int)decimalValue

Question 58

Cast decimal to double?

Answer 58

(double)decimalValue

Question 59

Operator for addition?

Answer 59

+

Question 60

Operator for subtraction?

Answer 60

-

Question 61

Operator for multiplication?

Answer 61

*

Question 62

Operator for division?

Answer 62

/

Question 63

Operator for remainder?

Answer 63

%

Question 64

How to enforce order of operations?

Answer 64

Use parentheses

Question 65

Result type of int + double?

Answer 65

double

Question 66

Result type of int + decimal?

Answer 66

decimal

Question 67

Can you mix double and decimal?

Answer 67

No

Question 68

Result of integer division?

Answer 68

Integer quotient only

Question 69

How to get decimal result from ints?

Answer 69

Cast operands to double

Question 70

What type does TextBox input return?

Answer 70

String

Question 71

Convert string to int?

Answer 71

int.Parse(string)

Question 72

Convert string to double?

Answer 72

double.Parse(string)

Question 73

Convert string to decimal?

Answer 73

decimal.Parse(string)

Question 74

How to convert number to string?

Answer 74

myNumber.ToString()

Question 75

How to show number in MessageBox?

Answer 75

MessageBox.Show(myNumber.ToString())

Question 76

Implicit number-to-string conversion?

Answer 76

Use "text" + number

Question 77

Specifier for number format?

Answer 77

N or n

Question 78

Specifier for fixed point?

Answer 78

F or f

Question 79

Specifier for exponential?

Answer 79

E or e

Question 80

Specifier for currency?

Answer 80

C or c

Question 81

Specifier for percentage?

Answer 81

P or p

Question 82

What is an exception?

Answer 82

Unexpected runtime error

Question 83

What is a try-catch statement?

Answer 83

Structure to handle exceptions

Question 84

Where to place risky code?

Answer 84

Inside try block

Question 85

Where to handle exceptions?

Answer 85

Inside catch block

Question 86

What happens on invalid parse?

Answer 86

An exception is thrown

Question 87

Display default exception message?

Answer 87

MessageBox.Show(ex.Message)

Question 88

Show custom error message?

Answer 88

MessageBox.Show("Invalid data was entered.")

Question 89

What is a constant?

Answer 89

Named value that cannot change

Question 90

How to declare a constant?

Answer 90

const Type NAME = value;

Question 91

Constant naming convention?

Answer 91

Uppercase letters

Question 92

What is a field?

Answer 92

Variable declared at class level

Question 93

What is field scope?

Answer 93

Entire class

Question 94

When is a field created?

Answer 94

When its class instance is created

Question 95

What does Math.Sqrt(x) do?

Answer 95

Returns the square root of x

Question 96

What does Math.Pow(x,y) do?

Answer 96

Returns x raised to the power y

Question 97

What is Math.PI?

Answer 97

Ratio of circumference to diameter

Question 98

What is Math.E?

Answer 98

Base of natural logarithm

Question 99

What is an access key?

Answer 99

Alt+letter mnemonic for control

Question 100

How to assign an access key?

Answer 100

Add '&' before the letter in Text

Question 101

Is access key case-sensitive?

Answer 101

No

Question 102

Which property sets background color?

Answer 102

BackColor

Question 103

Which property sets text color?

Answer 103

ForeColor

Question 104

What tabs are in color list?

Answer 104

Custom, Web, System

Question 105

What property sets form background image?

Answer 105

BackgroundImage

Question 106

What property sets image layout?

Answer 106

BackgroundImageLayout

Question 107

Layout options?

Answer 107

Tile, Center, None, Stretch, Zoom

Question 108

Which container shows a title?

Answer 108

GroupBox

Question 109

Which container lacks a title?

Answer 109

Panel

Question 110

Which container supports border style?

Answer 110

Panel