Basic Computer Programming Using VB6

7/31/2019 Basic Computer Programming Using VB6

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7. Draw the flowcharts.

8. Follow the guidelines in creating a

flowchart.9. Develop critical, logical and analytical

thinking in preparing for program writing.


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Programming Is the process of giving instruction toa computer

Programs Are the instructions given to the

computer to arrive at a certain result.


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Logic formulations and problem-solving arethe fundamentals of programming. Itrequires an intricate process of critical andanalytical thinking combined with precision

and keenness to details. The planning stageis very important because it serves as thebackbone of any program.

NOTE:


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A logical procedure or set of stepsto be followed to arrive at asolution to a problem.

An algorithm is the breakingdown of a problem into simplesteps in order to find the rightanswer.


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Recipe in a cookbook a complicated dish isbroken down into simple cookinginstructions.

Choreography of a dance a difficult dance isbroken down into a succession of basic steps

Word problem in Math a complex problemin Math is broken down into parts to arrive ata solution.


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An algorithm in Englishstatements in an outline form.

This is used to conceptualizethe flow of the program beforeencoding it in a programming

language.


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Pseudocode for Making Soap Step 1: Prepare your workspace

Step 2: Cut and weight the soap base.

Step 3: Melt the soap base.

Step 4: Add the fragrance or essentials oil Step 5: Add color to the melted soap

Step 6: Stir the melted soap

Step 7: Pour the soap into the mold

Step 8: Unmold the soap


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Pseudocode for Taking a special quiz Step 1: Talk to the teacher. Tell her your concern

Step 2: Give her the excuse letter

Step 3: Ask politely for a schedule to have a quiz

Step 4: If you are free on the given schedule, tellher you will be there to take the quiz.

Step 5: If the schedule will be conflicting to anotherspecial quiz ask for another time and date until the

schedule is finalized. Step 6: Go on the scheduled date and time.


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The graphical representation of analgorithm. Flowchart is the pictorialdescription of sequenced activities

and logic to be performed by thecomputer for carrying out dataprocessing. It uses special symbols

which represent a specific function.


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Flowcharts are used by programmers beforethe actual start of any programming activity.

Flowchart is otherwise known as

Flowcharts are used by programmers beforethe actual start of any programming activity.

Flowchart is otherwise known as

Flowchart is the so called BLUE PRINT of aprogram.


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TERMINAL- Represents thebeginning and the end of the

program. It contains the wordsBegin or Start and End or

Stop.

PROCESS OR ACTION -Representsa step or an instruction such ascomparison or arithmetic operations.

Ex: Gather all materials in a box;

Add 5 and 7

INPUT OR OUTPUT - Represents thestep wherein information such asletters and numbers are entered bythe user or produced by the process.

Ex: Input 3 numbers; Get A, B, C;

Print A


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ARROW OR FLOW DIRECTION

INDICATOR Indicates the flowof direction or the next activity.

DECISION Denotes a decision tobe made. It involves 2 courses of

action that is answered by eitheryes/true or no/false wherein one

has to chosen. The symbolrepresents the if..then{, and the for

.. Next statements

PREPARATION

Represents theprocess that will change the directionof initialization of any value or theexecution of a variable.


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PREDEFINED PROCESS OR

SUBROUTINE Indicates asubmodule or subflowchartembedded within a larger

process. It can be described in adetail in a separate flowchart.

ON-PAGE CONNECTORS

Indicates that the process iscontinued where the matching on

page connector is placed (either onthe same page or at a different page)


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BEGIN

Exercise daily

Give time, effortand commitment

ENDFit and

healthy body

Sleep 8 hours a day

Have a balanced diet

Take vitamins


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No

Yes

BEGIN

Correctusername

andpassword

END

Type Internetusername and

password

Access the

Internet


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1. The flow of the program is easilyunderstood.

2. It determines the validity of the processesinvolved in the program.

3. Debugging or correcting of errors becomes lesscomplicated.

4. It produces effective program documentation.


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1. Determine the following:

Data to be entered

Information to be produced

The way the data will be entered The point when data will be given

The point when information will be produced

1. There should be only be one start/begin and

stop/end processes.2. Concentrate on the logic of the program.

3. Choose only the important steps. No need torepresent all the steps in the flowchart.


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2 classifications of programming language.These pertains to the ways on how theprogram are written.

resembles humanlanguage and corresponds to severalmachine language instructions

or machine

language, describes exactly the proceduresto be carried out by the computers centralprocessing unit


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High level Programming language includes :

1. Visual Basic

2. Java3. Visual C++

4. BASIC

5. Pascal

6. COBOL

7. FORTRAN


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Okay now, start getting busy by doing yourfirst exercise for this module.


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Plant and produce carrots Charter change (with decision box)

Get the area of a rectangle

Input 2 numbers and print the largernumber

Get the quotient of 2 numbers and print thequotient if it is greater than 5

Compute and print for the average of 3numbers


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A program handles different data to beprocessed by the computer. These data areclassified into different types:

Numeric data - whole

numbers with decimal

Alphanumeric Data

numbers that cannot be used formathematical operations


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a single letter or a special character a combination of characters

Date and time

Logical Data


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A variables stores data, Itallocates a portion of the

memory depending on thetype of data a variables holds.


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It must begin with a letter or an alphabetand may be followed by combinations ofalphanumeric characters.

The name of the variables should beindicative of the value it holds.

Avoid using confusing letters or numbers

such as zero and the letter O. Use underscore in replacement of a space.


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Lessen the number of characters ofyour variable. The shorter thevariable, the better and more

efficient the program will be In most cases, uppercase andlowercase letters are read differently

A and a may hold different data


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Constants are values that do not changeduring the execution of the program.

Examples: Pi = 3.1416

X=100


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Classifications of Operators Arithmetic Operators

Addition

Subtraction

Multiplication Division

Exponentiation

Modulus

NegationEx: 5+(4*2/2) 3 =6


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Relational Operators Greater than >

Less than =

Less than or equal to


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Input 2 whole numbers. Compute and printthe sum of the 2 numbers


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When a problem involves the 3 Types ofoperators, the following order should befollowed.

The hierarchy is as follows:

1st Arithmetic operators

2nd Comparison operators

3rd logical operators


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The hierarchy is as follows:

1st NOT

2nd AND 3rd OR

Ex:

5*5+10/5 >40 AND 8


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Input 5 numbers. Find the sum, differenceand product of the number. Print the answer

Convert a number in degree Fahrenheit (0F) toCelsius (C)

A rectangular table has a length of 60.5

inches and a width of 20.5 inches. Find andprint the perimeter.


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Conditional statements is one of the vitalcomponents in programming. It enables aprogram to respond in a different mannerevery time a program is executed

depending on the data entered.

The commonly used conditional statementsare:

If statement If ...then.. Else statements

Select case statements


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This is used to evaluate a condition or checka value as true or false. If the condition isnot met, the succeeding statements or set ofstatements will executed.

SyntaxIf condition

Statement

End if


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Input a color. If the color is blue, display themessage The color is blue.

Algorithm:

String colorBegin

Input color

If color= blue

Print The color is blue

End If

End


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Input a score. If the is 100, display themessage Excellent


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This is used to evaluate a condition or checka value as true or false. If the condition isnot met, the statement or set of statementsafter will be executed

Syntax: If condition then

Statement 1

Else

Statement 2End if


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If condition thenStatement(s)

Else if condition 1 then

Statement(s)

Else if condition 2 then

Statement(s)

Else

Statement(s)


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Input a grade. If the grade is greater than orequal to 75, display the message You passedthe subject, otherwise display Study hard

Input 2 prices and get the total. If the total is

more than P500, get 5% of the total, if thetotal is more than P500 but less than or equalto P1000, get 10% of the total, but if the totalis greater than P1000, get 15% of the total.

Display the discounted price.


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The case statement is similar to the use ofthe If... Then .. Else statement. It is usedwhen a variable is compared to differentvalues or expressions.

SyntaxSelect Case test expression

Case expressionlist1

Statement Block1Case expressionlist2

Statement Block2

End Select


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Conduct Grade Equivalent1 Excellent

2 Very Good

3 Good

4 Satisfactory

5 Needs Improvement

Input a conduct grade and display the

equivalent rating


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Okay now, start getting busy by doing yourfirst exercise for this module.


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Basic Computer Programming Using VB6