Catalog guidelines of 3-4 hours per week per unit

CS 14 Final Grade vs. Class Attendance, Win/Spr 2004

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Class Attendance

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Operators in VB: Part IOperators in VB: Part I

Symbol Name

^ Exponentiation* Multiplication/  Division +  Addition - Subtraction

We have seen 5 arithmetic operators

Operators in VB: Part IIOperators in VB: Part II

Symbol Name

=  Equality < >  Inequality ()<  Less Than>  Greater Than<=  Less Than or Equal To () >=  Greater Than or Equal To ()

We have seen 6 relational operators

Operators in VB: Part IIIOperators in VB: Part III

Symbol Name

Not  Negation And  ConjunctionOr Disjunction

We have seen 3 Boolean operators

Operators in VB: Part IIIIOperators in VB: Part IIII

Symbol Name

& Concatenation  

We have seen 1 string operator

Operands in VB: Part IOperands in VB: Part I

 

Examples of arithmetic operands

5 The literal number 5

-2 The literal number –2

12.4 The literal number 12.4

Dim shtAge As Short The variable shtAge

Dim lngX As Short The variable lngX

Const sngTax = 1.07 The constant sngTax

Operands in VB: Part IIOperands in VB: Part II

 

Examples of string operands

“A” The literal string “A”

“-2” The literal string “-2”

“Homer” The literal string “Homer”

Dim strName As String The variable strName

Dim strQ As String The variable strQ

Const StrM = “NO” The constant StrM

Operands in VB: Part IIIOperands in VB: Part III

 

Examples of Boolean operands

True The literal logical value True

False The literal logical value False

Dim blnIsMale As Boolean The variable blnIsMale

Expressions In VB: Part IExpressions In VB: Part I

 

Expressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

1 1

1 + 1 2

1 + 1 + 1 3

Expressions In VB: Part IIExpressions In VB: Part II

 

Expressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

(1 + 1 + 1) 3

(1 + 1) * 3 6

10 / 3 3.333333333

1 + 1 2

-(1 + 1) -2

-(-1-1) 2

Expressions In VB: Part IIIExpressions In VB: Part III

 

Expressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

“Five” “Five”

“5” “5”

“(5 + 5)” “(5 + 5)”

“One” & “Time” “OneTime”

“One” & “ Time” “One Time”

“U” & (2).ToString “U2”

Expressions In VB: Part IIIIExpressions In VB: Part IIII

 

Expressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

“Five” + 5 illegal

+ 5 illegal

- 5 - 5

“One” & 5 illegal

10 / 0 Runtime error

0 / 10 0

Expressions In VB: Part VExpressions In VB: Part VExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

True True

False False

(True) True

Not(True) False

Not(False) True

Not(Not(False)) False

Expressions In VB: Part VIExpressions In VB: Part VIExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

2 > 1 True

2 < 1 False

(2 > 1) True

2 >= 1 True

(2 >= 2) True

(2 = 2) True

Expressions In VB: Part VIIExpressions In VB: Part VIIExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

Not(2 = 12) True

Not(12 = 12) False

Expressions In VB: Part VIIIExpressions In VB: Part VIIIExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

True And True True

True And False False

False And False False

False Or False False

False Or True True

Not(False Or True) False

Expressions In VB: Part IXExpressions In VB: Part IXExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value

Expression Evaluates to

True And (2 > 1) True

True And (2 = 1) False

(1 = 1) And (2 = 1) False

False Or False Or False False

True Or (False And True) True

(True Or False) And True True

Not((2 * 3 = 1 + 5) And (“U” & “2” = “U2”))

Not(( 6 = 1 + 5) And (“U” & “2” = “U2”))

Not(( 6 = 6 ) And (“U” & “2” = “U2”))

Not(( True ) And (“U” & “2” = “U2”))

Not(( True ) And ( “U2” = “U2”))

Not(( True ) And ( True ))

Not(( True ))

False

Expressions In VB: Part XExpressions In VB: Part XExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value Expression Evaluates to

Dim shtAge As Short

shtAge = 12

(shtAge + 2) 14

Dim shtX As Short

shtX = 0

(shtAge + 11) * 10 11

Expressions In VB: Part XIExpressions In VB: Part XIExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value Expression Evaluates to

Dim shtAge As Short

shtAge = 12

(shtAge > 11) True

Dim shtX As Short

shtX = 0

(11 / shtAge) * 10 Runtime Error

Expressions In VB: Part XIIExpressions In VB: Part XIIExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value Expression Evaluates to

Dim shtS As String

shtS = “Lisa”

(shtS) “Lisa”

Dim shtS As String

shtS = “Lisa”

shtS & “ Simpson” “Lisa Simpson”

Expressions In VB: Part XIIIExpressions In VB: Part XIIIExpressions consist of one or more operands and zero or more operators.

Expressions always evaluate to a single value Expression Evaluates to

Dim blnB As Boolean

blnB = False

(blnB And (12 > 2)) False

Dim shtS As String

shtS = “Lisa”

“Lisa” < “Bart” False

HomeworkRead Drills 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10, 4.1, 4.2, 4.3, 4,4, 4.5 4.6, 4.7, 4.8, 4.9, 4.10, 4.11, 4.13 and 4.14 in the book (the answers are in the book).

Working in groups of size 1, 2 or 3:Take one question from (3.1, 3.2, 3.3, 3.4, 3.5) and one from (3.6, 3.7, 3.8, 3.9, 3.10) and one from (4.1, 4.2, 4.3, 4,4, 4.5 4.6) and (4.7, 4.8, 4.9, 4.10, 4.11, 4.13, 4.14 ) and write a new version of it.

The next page shows examples of the type and quality of work I expect.

Homework is due on Friday the 15th

Joe Doe (SID 23431) and Jane Doe (SID 855675) Homework 1

1) Drill 3.3 on page 58 is as follows:

If the following code were executed, would an overflow occur? If so, why?

Private Sub btnCalculate_Click(... Dim shtVariable As Integer

shtVariable = 10000 shtVariable = shtVariable * 3End Sub

Private Sub btnCalculate_Click(... Dim shtVariable As Integer

shtVariable = 10000 shtVariable = shtVariable * 3End Sub

Answer: An overflow will not occur.

The exercise is suppose to test our knowledge of the concept of overflowing, which is defined as attempting to place a value into a variable which is too small to hold it. In our modification we have changed the exercise to consider the Long type, instead of the Integer type, and to consider the related concept of underflowing. which is defined as attempting to place a negative value into a variable whose type cannot hold such small values. According to the book, the most negative value a Long can hold is –9,223,372,036,854,775,808. So our example starts by defining a Long, initializing it to –9,223,372,036,854,775,800, then asking the user what will happen if we subtract 5, and what will happen if we subtract another 5. The exercise is below

If the following code were executed, would an overflow occur? If so, why?

Private Sub btnCalculate_Click(... Dim LngVar As Long LngVar = –9,223,372,036,854,775,800 LngVar = LngVar – 5 ‘what happens here? LngVar = LngVar – 5 ‘what about here?End Sub

Private Sub btnCalculate_Click(... Dim LngVar As Long LngVar = –9,223,372,036,854,775,800 LngVar = LngVar – 5 ‘what happens here? LngVar = LngVar – 5 ‘what about here?End Sub

Answer 1: (write an explanation here, ek)