One of the fascinating machine man was able to develop and
invented is the computer. This tool makes our day to day work more easier and
efficient in a way that most common task and repetitive work can be done by the
computer faster and most important is
its accuracy to perform computation.
Computer evolves a lot from a mere tool for solving mathematical
problems during second world war into a machine that runs our entire
information system around the world. As
a user we always rely on the aspect the computers can always gives us correct
results as long the program that runs on it is correct all the time.
This is also one of my thinking before when I started my
study in computer science during my college days our teacher would tell us if
we right correct code in our program it will always generate correct results he
is correct. But I have later learned in my later career in information
technology field that even we have a correct written program there are some
situation that our program will misbehave or gives us wrong results. It is a
funny story that I have read and hear that some people always blame the
computer if they can't get the right result that they needed. Common sense
tells us that computer is a machine it does not its own mind of thinking
compared to us human being that we are intelligent over many things including
animals that surround us.
Computer
scientist wrote different principles in programming to create error free
programs but the problem is the users does not understand most of the time what
are the limitations of the computer. For
instance our program will ask the user to enter their name in the system and
our program will store those information in the database. If the user will give
erroneous information about themselves or wrong spelling our program does not
have the capability to check for those entries in the first place. We can only
check if the fields are not empty before it will be submitted to our system to
be saved but the verification must be done first by the user in the first
place.
For me the biggest time that is allocated is not just
writing the code of the program but in the process of debugging finding and
correcting errors in our program. Once we correct the errors in our program we
deploy our program to our end user they are the one will scrutinize and give us
the feedback about the problems that they encounter in your our program. In
order for us to minimize this problem we must able to have a good program
planning before we write our first line of code in our program. By this way we
can focus in solving the main problem of program and make our user happy by
giving them a program that is very easy to use and more efficient to cater
their day to day work.
In this article I will discuss about a program that will
check if the number being given by the user is prime number or not. Most of us during our elementary years our
math teacher teach us the if a number the is integer by nature is bigger than
one and have no other divisors other than oen and itself is considered as prime
number. For example 5 is a prime number,
since no number except 1 and 5 divides on it. It is also the same with 8 is not considered
as prime number because it can be divide by 2 and 4.
What our program will do is very simple it will ask the user
to enter a number in our text box. There are three command button the first
command button is check prime if the user click this button it automatically
determines whether the number is prime number or not a prime number by
displaying a message in our form. The
second command button is the clear is this clear button allows the user to
clear the text box and label message in our form that enables the user to enter
new number to be check by our program. The third and last button is quit button
this quit button if the user choose it will display a message dialog box asking
the user if the user wants to quit the program for good or continue using the
program. I also put a code that will
check if the user was not able to put any number in the text box it will give
the user a message to put some numbers in the text box. This code I wrote just
to protect our program to generate a wrong value.
I hope you have learned something in our program Prime
Number Checker written in Visual Basic .NET if you have some questions,
comments and suggestions how I can improve my codes and articles please send
me an email I am very glad to hear it from you as readers in this website.
Thank you very much.
Sample Output of Our Program
Program Listing
Private Sub
Prime_Number_Check(ByVal number_value As Integer)
Dim prime_number As Boolean = True
For i = 2 To
number_value / 2
If (number_value Mod
i = 0) Then
prime_number = False
Exit For
End If
Next i
If prime_number = False
Then
lbl_message.Text = "The number "
& Val(txt_value.Text) & " is not a
Prime number."
Else
lbl_message.Text = "The number "
& Val(txt_value.Text) & " is a Prime
number."
End If
End Sub
Private Sub
btn_check_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
btn_check.Click
If Trim(txt_value.Text) = ""
Then
MsgBox("You must put a number it can't
be empty.")
Me.txt_value.Focus()
Me.lbl_message.Text = ""
Else
Prime_Number_Check(Val(txt_value.Text))
End If
End Sub
Friend WithEvents
Button1 As System.Windows.Forms.Button
Private Sub
Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
Button1.Click
Me.txt_value.Text = ""
Me.lbl_message.Text = "
"
Me.txt_value.Focus()
End Sub
Friend WithEvents
btn_quit As System.Windows.Forms.Button
Private Sub
btn_quit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
btn_quit.Click
If MsgBox("Are you
sure you want to quit?", MsgBoxStyle.Critical
+ MsgBoxStyle.YesNo, "Quit Program?") = MsgBoxResult.Yes
Then
Me.Hide()
Else
Me.Show()
Me.txt_value.Text = ""
Me.lbl_message.Text = "
"
Me.txt_value.Focus()
End If
End Sub
End Class
