Software becomes the driving
force of information technology at present time, most of us are very dependent
on software in doing our day to day task or work. For example if you are an office clerk your
main job is to prepare the documents, worksheet and presentation for instance
we need to use a complete application to do the work that we need. That's why
we use Microsoft Office like ms work, ms excel and ms power point to do the job.
This software are very complex that it
requires hundreds or even thousands of programmers to write this application.
It also evolves many years of careful planning, design and development. On the part of Microsoft Corporation they
invest big amount of resources like money and facilities during the development
of Microsoft Office applications before it will be released and sold in the
market.
As a freelance developer I also
encounter many challenging problems involving software design and development
one of the most common problem is that the client or customer doesn't not have
an adequate understanding about the real problem of their proposed information
system that they are planning for me to developed. Another thing that I have
observed once I was able to finish the system my client wants another features
and changes for the system, if the changes related to my mistakes being a
programmer I change it free from charge but if it related to features that are
not included in an agreement that we have I charge them reasonable price for the
services in programming.
In software design and
development it is a must bust client and developer to set down and plan very
well what are the needs, problems identified in the current system before the
ball rolling in writing a code. Well organized planning will cut down the
development time by half because the programmer can focus very well in solving
the problem rather than thinking what are the additional problems to be solve
in the proposed system whether the client needs a business application or
system application this procedure is still applicable. One of my close friend that is also a good
application developer in Java told me during our college days solve first the
problem before make some good design. I agree because once you solve the
problem in algorithm it is easier for us to do the design. I hope this advice that I shared with you will
help you in your software development.
In this article I will discuss a
simple program that I wrote in Microsoft Visual Basic .NET I called this
program Fahrenheit To Celsius Solver. What this program will do is very simple
it will ask the user to enter a value in Fahrenheit in our text box. By this
time I gave the user the two option in solving the value of Celsius the first
option is press the enter key and will give you the result in our label or the
user can press the Solve Celsius button to get the result in the label in the
form. I also included a button to clear
the label and the text box and finally the last button which enables the user
to quit the program and return to our windows operating system. The code is
very short and very easy to understand by beginning programmers in Visual Basic
.NET.
Thank you very much.
Sample Output of Our Program
Program Listing
Private Sub
txt_fahrenheit_KeyPress(ByVal sender As Object, ByVal e As
System.Windows.Forms.KeyPressEventArgs) Handles txt_fahrenheit.KeyPress
If e.KeyChar = ControlChars.Cr
Then 'Enter key
lbl_result.Text = "The temperature
equivalent in Celsius is " & _
((CInt(txt_fahrenheit.Text) * 9) / 5) +
32 & " Cº."
End If
End Sub
Private Sub
btn_celsius_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
btn_celsius.Click
lbl_result.Text = "The temperature
equivalent in Celsius is " & _
((CInt(txt_fahrenheit.Text) * 9) / 5) +
32 & " Cº."
End Sub
Private Sub
btn_clear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
btn_clear.Click
txt_fahrenheit.Clear()
lbl_result.Text = " "
txt_fahrenheit.Focus()
End Sub
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()
txt_fahrenheit.Clear()
lbl_result.Text = " "
txt_fahrenheit.Focus()
End If
End Sub
End Class
