Ministry of Higher Education And
Scientific Research
Babylon University
College of Material Engineering
Subject: Programming in Visual Basic
Polymers Engineering Department
2015-2016
Language
Class: Second Year
Lecturer: Hussein Mohammed Salman
Lecture-8: Input Tools and Methods
In each language , there are many tools and methods used to read and
input the data (values of the variables) such as read and input statement,
in the Visual Basic there are main two methods for the input tools:
First : by using the Text Box tool ; This tool basically used for dealing
with the text data, however there is way to make it deal with the numeric
data by using the val() function that convert the digits read by text box
from the text format to the numeric format. This is very clear in the last
lectures.
Second : The InputBox ( ) Function
An InputBox ( ) function will display a message box where the user can
enter a value or a message in the form of text.
The general format of the InputBox() is:
InputBox (Prompt, [Title] , [default] , [x-position], [ y-position],[helpfile
context])
The arguments are explained as follows , where each argument in the
square bracket is an optional test :
•
Prompt : The message displayed in the input box.
•
Title : The title of the input box window.
•
Default : The default value that appears in the input field where
users can use it as his intended input or he may change to another
message.
•
X-position and y-position : the position or the coordinate of the
input box.
As in the following figure
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Ministry of Higher Education And
Scientific Research
Babylon University
College of Material Engineering
Subject: Programming in Visual Basic
Polymers Engineering Department
2015-2016
Language
Class: Second Year
Lecturer: Hussein Mohammed Salman
For example , suppose we read the variable x as the following statement:
X=inputbox("read the number x",,30)
In this example , notice that the second argument not found ,this means
that we not focus on this argument because it is optional , where any
optional argument may be used or not .
Example: Design a project to read three numbers and add them by using
the inputbox function. In this project will not need more tools also for
all project used this function , as follow:
1st Stage: Form Design
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Ministry of Higher Education And
Scientific Research
Babylon University
College of Material Engineering
Subject: Programming in Visual Basic
Polymers Engineering Department
2015-2016
Language
Class: Second Year
Lecturer: Hussein Mohammed Salman
2nd Stage: Set Properties
Object (Tool)
Command1
Text1
Property
Setting
Name
Caption
Font
Font Size
Name
Text
cmdAdd
Add
Times New Roman
14
txtAdd
3rd Stage: Code Write
cmdAdd (Add)
dim a as integer, b as integer, c as integer, sum as integer
a=inputbox("read first number")
b=inputbox("read second number",,12)
c=inputbox("read third number","Third Number",10)
sum=a+b+c
txtAdd.text=sum
When the project executed , the input box window of the –a- variable is
as below , note it not include any default value and the title is set by the
VB manipulator .
While the input box window of the –b- variable is as below , note it
includes a default value and but the title is set by the VB manipulator .
This Lecture allowed on: www.uobabylon.iq.edu
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Ministry of Higher Education And
Scientific Research
Babylon University
College of Material Engineering
Subject: Programming in Visual Basic
Polymers Engineering Department
2015-2016
Language
Class: Second Year
Lecturer: Hussein Mohammed Salman
While the input box window of the –c- variable is as below , note it
includes a default value and a title is Third Number which set by the
designer of the project.
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