Variables in Visual Basic Programming
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This document is a lesson on variables in Visual Basic programming. It defines a variable as a location in memory that holds information during program execution. It explains that variables are declared to create them in memory and initialized to assign them a value. Different data types like byte, integer, and long can be used to store different kinds of numeric values in variables. The document provides examples of declaring, initializing, and performing math operations on variables.
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Geometric Transformations II
Geometric Transformations IIKasun Ranga Wijeweera This document discusses 2D geometric transformations, including composite transformations where multiple transformations are applied sequentially as Pn = Tn...T2T1, and transformation matrices for general pivot point scaling and rotation. Scaling and rotation transformations are defined using matrices where the pivot point (x1, y1) is specified. Composite transformations allow multiple basic transformations to be combined into a single net transformation T.
Geometric Transformations I
Geometric Transformations IKasun Ranga Wijeweera This document discusses 2D geometric transformations including translation, scaling, and rotation. Translation moves an object by adding offsets tx and ty to the x and y coordinates. Scaling enlarges or shrinks an object by multiplying the x and y coordinates by scaling factors sx and sy. Rotation rotates an object around the origin by an angle θ, with the new x and y coordinates calculated using trigonometric functions of the original point coordinates and θ.
Introduction to Polygons
Introduction to PolygonsKasun Ranga Wijeweera A polygon is defined as a shape formed by connecting straight line segments between points in a plane such that: 1) Adjacent line segments intersect only at their shared endpoint; and 2) Non-adjacent line segments do not intersect. A polygon is made up of vertices located at the points, and edges along the straight line segments connecting them, with the number of vertices equaling the number of edges.
Bresenham Line Drawing Algorithm
Bresenham Line Drawing AlgorithmKasun Ranga Wijeweera This document explains the Bresenham line drawing algorithm in 5 parts. It describes how the algorithm works to draw a line on a pixel grid by incrementally choosing the next pixel based on the slope. It provides an example of drawing a line from (2,3) to (7,5), showing each step of calculating the error term and choosing the next pixel. The algorithm is useful for raster graphics as it results in the fastest line drawing method for slopes less than 1.
Digital Differential Analyzer Line Drawing Algorithm
Digital Differential Analyzer Line Drawing AlgorithmKasun Ranga Wijeweera This document describes the Digital Differential Analyzer (DDA) line drawing algorithm for computer graphics. It explains that a computer screen is made up of a grid of pixels. The DDA algorithm uses the difference in x and y coordinates between the start and end points of a line to determine how many steps it will take to draw the line. It then calculates the change in x and y per step, draws each pixel along the line incrementally, and provides an example of drawing a line from point (2,3) to (7,5) over 5 steps.
Loops in Visual Basic: Exercises
Loops in Visual Basic: ExercisesKasun Ranga Wijeweera This document provides instructions for four Visual Basic programming exercises involving loops. The first three exercises involve generating integers from 1 to 10 using different loop structures and displaying the results in message boxes. The fourth exercise involves programming a button to check if a number entered in a text box is a prime number and displaying "Yes" or "No" accordingly in a message box.
Conditional Logic: Exercises
Conditional Logic: ExercisesKasun Ranga Wijeweera The document provides instructions for 6 exercises to practice conditional logic in Visual Basic programming. For each exercise, the instructions specify creating a Windows Forms application project with text boxes and buttons to get user input and display output messages. The buttons are programmed to evaluate conditions on the input and display the corresponding text ("Even/Odd", "Yes/No", or a letter grade) in a message box based on the conditional logic for each exercise.
Getting Started with Visual Basic Programming
Getting Started with Visual Basic ProgrammingKasun Ranga Wijeweera This document is the first lesson of a 8 part series on Visual Basic programming. It introduces some basic concepts like what a computer program and programming language are. It then provides instructions on how to get started with the Visual Studio Integrated Development Environment, including how to create a new Windows Forms Application project by selecting options, specifying a name and location, and viewing various windows.
CheckBoxes and RadioButtons
CheckBoxes and RadioButtonsKasun Ranga Wijeweera This document discusses CheckBox and RadioButton controls in Visual Basic. CheckBoxes allow users to select multiple options from a group, while RadioButtons only allow a single selection. The code examples show how to retrieve the text of checked CheckBoxes or the selected RadioButton and display it in a message box. RadioButtons require an If/ElseIf statement to determine the selected option, while CheckBoxes simply check each one's CheckState property.
Loops in Visual Basic Programming
Loops in Visual Basic ProgrammingKasun Ranga Wijeweera This document discusses different types of loops in visual basic programming: While...End While loops, which repeatedly execute code as long as a condition is true; Do...Loop loops, which execute code while or until a condition is met; and For loops, which execute code a specified number of times. It provides examples of code snippets using each type of loop and describes their outputs.
Conditional Logic in Visual Basic Programming
Conditional Logic in Visual Basic ProgrammingKasun Ranga Wijeweera This document discusses conditional logic in Visual Basic programming. It provides examples of using If/Then statements to execute code based on whether a condition is true or false. Specifically, it demonstrates:
- Using If/Then to check for equality and show a message box if two variables are equal.
- Using If/Then/Else to check for equality and show different message boxes depending on if the variables are equal or not equal.
- Using If/Then/ElseIf/Else/End If to check multiple conditions and show different message boxes depending on which condition is met.
Assignment for Variables
Assignment for VariablesKasun Ranga Wijeweera This document contains instructions for 3 Visual Basic programming assignments involving variables. The first assignment has the user declare integer variables, perform a sum calculation, and display the result. The second assignment declares string variables to store name fields, concatenates them into a full name, and displays it. The third assignment takes a user-entered integer, stores it in a variable, multiplies it by 10, and displays the result.
Assignment for Factory Method Design Pattern in C# [ANSWERS]
Assignment for Factory Method Design Pattern in C# [ANSWERS]Kasun Ranga Wijeweera The document describes implementing a factory method design pattern to create different shape objects like circles, ellipses, rectangles and squares. It defines an interface IShape with methods to calculate area and perimeter. Classes are created for each shape inheriting the interface. A Creator class uses factory method to return the appropriate shape object based on user input character. Sample code demonstrates creating a circle object with radius 7 and computing its area and perimeter.
Assignment for Events
Assignment for EventsKasun Ranga Wijeweera The document outlines 6 lessons on using events in Visual Basic programming. It instructs the reader to create Windows forms applications with buttons and text boxes and write code to trigger messages or actions when events occur, such as a button click, mouse press, or text box update. The events covered include displaying messages on left or right mouse button clicks, clearing a text box on spacebar press, and converting text to uppercase on leaving a text box.
Mastering Arrays Assignment
Mastering Arrays AssignmentKasun Ranga Wijeweera This document provides instructions for 5 Visual Basic array programming assignments:
1) Store values in an integer array and display them using message boxes. Try accessing an invalid index.
2) Populate an integer array from a user-input start value. Display the array in a list box.
3) Store user text inputs in a global string array. Concatenate and display the concatenated array.
4) Populate a dynamic integer array with random numbers. Display in a list box.
5) Implement and multiply two matrices stored in arrays. Display the product matrix.
An Exercise for Factory Method Design Pattern in C#
An Exercise for Factory Method Design Pattern in C#Kasun Ranga Wijeweera This document describes an exercise to implement the Factory Method design pattern in C# to handle different shape objects. It defines an interface with methods to calculate area and perimeter for shapes. Classes would be created for Circle, Rectangle, Square and Ellipse, with inheritance. The factory would create the appropriate shape object based on a user input character, and there is an example of creating a Circle with radius 7 and calculating its area and perimeter using the given formulas.
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- 1. Lesson 2 of 8 Visual Basic Programming 1 of 4 Lesson 2: Variables Author: Kasun Ranga Wijeweera Email: [email protected] Date: 2020 May 08 A variable is a storage location in memory of the computer that holds information while the program is running. The statement that creates a variable in memory is called declaration of the variable. An example code is given below. Dim x As Byte Dim, As, Byte are keywords. x is the variable name. Byte is the data type. Byte data type holds unsigned 8-bit integers that range in value from 0 to 255. The default value of Byte is 0. The statement that assigns a value to a variable is called initialization of the variable. An example code is given below. x = 234 The equals sign in the statement works as the assignment operator not as the equality operator. The value on the right is assigned to the variable on the left. 0 0 0 0 0 0 0 0x
- 2. Lesson 2 of 8 Visual Basic Programming 2 of 4 234 = 111010102 Data Types in Visual Basic Integer Byte, Short, Integer, Long Floating-Point Single, Double, Decimal Other Boolean, Char, String, Date Data Types to Store Integers Dim age As Byte vs. Dim age As Long Several bytes of memory can be saved by storing age in a Byte instead in a Long. Now look at the code segment given below. Dim num1, num2, num3 As Integer num1 = 24 num2 = 57 num3 = num1 + num2 MessageBox.Show (num3) 1 1 1 0 1 0 1 0 Data Type Size Byte 8 bits Short 16 bits Integer 32 bits Long 64 bits x
- 3. Lesson 2 of 8 Visual Basic Programming 3 of 4 The line Dim num1, num2, num3 As Integer creates three memory blocks that hold default values. num1 0 num2 0 num3 0 The line num1 = 24 assigns the value 24 to the variable num1. num1 24 num2 0 num3 0 The line num2 = 57 assigns the value 57 to the variable num2. num1 24 num2 57 num3 0 The line num3 = num1 + num2 assigns the sum of the values of the variables num1 and num2 to the variable num3. num1 24 num2 57 num3 81
- 4. Lesson 2 of 8 Visual Basic Programming 4 of 4 The line MessageBox.Show (num3) displays the value of the variable num3 in a message box. Note that an assignment changes only the left operand while the right operand remains unchanged. Rules for Variable Naming The first character of a variable name must be either a letter or an underscore. Subsequent characters must be a letter, underscore, or digit. Variable names cannot contain spaces, periods, or many other kinds of characters. The keywords in Visual Basic cannot be used as variable names.