Programming Languages

Sip · February 14, 2002

At UCLA CS, they have 2 main courses: CS 31 and 32. 31 starts with basic programming with C/C++ (much like what you would do with BASIC) and then CS 32 does the OOP stuff. You won't have much trouble understanding OOP since Visual Basic is all object oriented !!! (as opposed to BASIC, QuickBasic, GWBasic, and all the older ones).

Harut · February 14, 2002

Sip jan, i remember learning that VB is NOT object oriented programming language.

they say it is object-based, because it does not fully support hirarchy, so it's not OOP language.

i just looked over future terms' scheduals, and there are two more courses that will teach C/C++. they are called OOP II and Advanced Programming With C.

the one that i'm going to take now is called OOP I.

Harut · February 14, 2002

besides programming languages, we also have a lot of System Analysis classes and Database classes.

some suggest that those classes are going to be much interesting, and that it would be wise to master those areas more than solely become a programmer.

what do you guys think?

Azat · February 14, 2002

Sip, VB is not oop. In advanced VB you can pretty much write apps that are very close to being oops apps, but VB fundamentally is not.

Harut, System analysis is okay. I found it interesting, but it is now great, however I personally love database coding and admin and working with HUGE databases. It is fun.

SQL is a very easy and basic language, but you can do miracles with it.

DBA work is very cool as well.

Also, I would be scared to jump into OOP with C/C++ without having a good foundation in C. I had 2-3 years of C knowledge and experience when I had to first learn C++ and it was a challenge.

MosJan · February 14, 2002

Harout-> SAS jan, inch anem? es HyeForum@ esents virusi nman mtela mejs, chem karum azatvem.

hankarts mi or chgam estegh, yerazits Movses@ galis a, esets satanayi kotoshnerov, u sksum a indz kheghtel. asum a:

"ure eir, ara!? ure eir, ara!?"

de, yes el stipvats galis em.

ba? esents baner.

tnashen ba shut aseyir yes el gitem ban chi statsvum indz mot sirt@s hangstatsav, uremn azduma qez vra He hA

ColerID ches tesel inch tsuyts talsi ???

de asem imatsy HArout Aper ^(666)^

Sip · February 14, 2002

Granted, VB is not trully OOP but it follows the same philosophy. You basically deal with objects each having properties (data), methods (functions) ... on top of that you have event-based control.

In my experience, people who know VB can grasp OOP much much easier than people who start off (and spend years) with pure functional languages such as C. In any case, I am not a big fan of pure OOP

Harut · February 21, 2002

i'm surprised!!!

listen what my VB professor said just yersterday, during the last meeting before final.

as he summed up the results of the term and told us what we should have learned from this course, he said something like this:

"this course was not designed to teach you VB programming language. we did not attampt to make to a VB programmers. the main objective of the course was to introduce to us the basic concepts of the programming. VB was chosen for this course only because it is easy language and it is easy to show the fundamentals of the programming to newcomers".

i was sort of disappointed that i didn't know this before.

parzvum a, we might take real VB course later.

and what should i do now? stop spending my time on VB and start concantrating on C++, or along C++ i also should keep studing VB?

i'm all confused now.

Sip · February 21, 2002

Harut jan, the more you know the better!

Down the road, it is good to concentrate on one but learn a bit of everything to get a good idea of how things work. Later on, you'll realize that VB, C++, Pascal, Java, Eifel, blah, blah, are basically the same! They all fall into the realm of "context free" languages that work great for "programming" the type of computers we have.

The way you write each will seem different at first, and they all have some specific differences but basically they are the same.

So I'd say learn a bit of both (or others like Java as well) and then decide which one you like.

VB is great for making business like applications. C/C++ on the other hand, is more general purpose and can be used for anything, especially if you want speed. It also gives the programmer much more control (over everything) than VB. Java was geared more towards the web but now it is becomming a very general purpose language.

I don't like Java much and I don't believe in it. The initial commercials sounded great but it just adds too much overhead compared to C/C++. Also, industry backing (like Microsoft) will have a big impact on what will happen to Java but the way Microsoft is pushing C# (C-sharp) and C/C++, I think they are here to stay for a while ... also remember that almost all of UNIX/Linux/Windows is written in C, so C will be here for a long long time.

[ February 21, 2002: Message edited by: Sip ]

Garo · February 22, 2002

I use Delphi (http://www.borland.com/delphi) most of the time and would suggest you to take a look at it. It's not as popular in the US as in the Europe but this is only because of the marketing issues.

Harut · February 22, 2002

quote:

Originally posted by Sip:
Harut jan, the more you know the better!

Down the road, it is good to concentrate on one but learn a bit of everything to get a good idea of how things work. Later on, you'll realize that VB, C++, Pascal, Java, Eifel, blah, blah, are basically the same! They all fall into the realm of "context free" languages that work great for "programming" the type of computers we have.

The way you write each will seem different at first, and they all have some specific differences but basically they are the same.

So I'd say learn a bit of both (or others like Java as well) and then decide which one you like.

VB is great for making business like applications. C/C++ on the other hand, is more general purpose and can be used for anything, especially if you want speed. It also gives the programmer much more control (over everything) than VB. Java was geared more towards the web but now it is becomming a very general purpose language.

I don't like Java much and I don't believe in it. The initial commercials sounded great but it just adds too much overhead compared to C/C++. Also, industry backing (like Microsoft) will have a big impact on what will happen to Java but the way Microsoft is pushing C# (C-sharp) and C/C++, I think they are here to stay for a while ... also remember that almost all of UNIX/Linux/Windows is written in C, so C will be here for a long long time.

[ February 21, 2002: Message edited by: Sip ]

well, i guess i still have a lot to go before decideing which one is good for me.
i don't know any language yet, except a bit of VB.

in any ways i hope i'll make the correct desision.
verchivercho, i have good friends like you guys, who will help me out.

Harut · February 22, 2002

quote:

Originally posted by Garo:
I use Delphi (http://www.borland.com/delphi) most of the time and would suggest you to take a look at it. It's not as popular in the US as in the Europe but this is only because of the marketing issues.

yesterday i picked up my books for coming term. two of which are "C++ How To Program" from Deitel & Deitel, and "Object-Oriented Programming Using C++" from Course Technology.

i briefly went over the intros, and somewhere there it mentions that link. it says we can download a free copy of Borland C++ from there.
i haven't checked it out yet. i'll do it now.

but i don't understand one thing.
does it matter which compiter i use? isn't C++ C++ whatever i use it with?

i got Visual Studio 6. is it good or bad?

Harut · February 22, 2002

guys, i need help with VB. i'm writing a small program for final. but i want to be a little fancy.

i have wrote this.

quote:

Private Sub cmbResult_Change()

Dim intLoop As Integer

Dim intLenght As Integer

intLenght = Len(cmbResult.Text)

For intLoop = cmbResult.ListCount - 1 To 0 Step -1

If intLenght = Left(cmbResult.List(intLenght)) Then

?????????????

End If

End Sub

what should i put instead of the question marks to set focus to a particular item in the list.

can anybody help, please?

thank you

Harut · February 22, 2002

sorry guys, i had made mistake.

here is the correct code.

but i still need something for Q marks.

quote:

Private Sub cmbResult_Change()

Dim intLoop As Integer

Dim intLenght As Integer

intLenght = Len(cmbResult.Text)

For intLoop = cmbResult.ListCount - 1 To 0 Step -1

If cmbResult.Text = Left(cmbResult.List(intLoop), intLenght) Then

????????????

End If

End Sub

cis_academy · February 22, 2002

Here is how You can find a good book on OOP[VB]

steps

: Type in Your browser window - Google then

: Google Search - Black Book C++ then

: Search Results are - Coriolis then

eBookstore

Barnes & Noble - C++ Black Book then

: Click - Barnes & Noble.com - C++ Black Book

: C++ Black Book Steven Holzner see, then

: Click - Steven Holzner see

: Output - Below are 1 - 25 of the 74 titles sorted in

bestselling order.

1.

Visual Basic 6 Black Book: Indispensable Problem Solver with Cdrom

Garo · February 22, 2002

quote:

Originally posted by Harut:
guys, i need help with VB. i'm writing a small program for final. but i want to be a little fancy.

i have wrote this.

what should i put instead of the question marks to set focus to a particular item in the list.

can anybody help, please?
thank you

What is the purpose of this sub?
There are 2 ways to make an item selected
1. listbox has a property that stores the selected item's index. you can change this property and assign the correct value.
2. list items have boolean property 'selected' which is true for the selected item. Assign true to that item's 'selected' property and it'll become selected.

I'm not sure about the exact syntax in VB.

Azat · February 23, 2002

Harut, maybe you can say what you are trying to accomplish and I can assist you.

Sip · February 23, 2002

quote:

Originally posted by Harut:

yesterday i picked up my books for coming term. two of which are "C++ How To Program" from Deitel & Deitel, and "Object-Oriented Programming Using C++" from Course Technology.

i briefly went over the intros, and somewhere there it mentions that link. it says we can download a free copy of Borland C++ from there.
i haven't checked it out yet. i'll do it now.

but i don't understand one thing.
does it matter which compiter i use? isn't C++ C++ whatever i use it with?

i got Visual Studio 6. is it good or bad?

That Dietel and Dietel book is excellent. That's also the same one UCLA uses to teach intro to C/C++.

Visual Studio 6 is the best development environment ever made! Microsoft's C/C++ compiler is also very good.

C and C++ should be the same as long as you stick to the ANSI standards. ANSI C is very well defined but C++ is still being changed. New features are being added and removed and some compilers may or may not support some features. However, almost all compilers support the basic stuff so your choice of compiler will not make a difference.

The only thing is that don't confuse development environment and compiler. Visual Studio can make it seem like everything is integrated together but the complier is a separate program. Microsoft's 32-bit C/C++ compiler is called cl and you can use it to compile programs without using the Visual studio environment.

Although most people will use the Visual C++ environment to work on their programs (somewhat like how you would work on a visual basic program). But at the end, CL is compiling your code into an executable.

There are other compilers like GCC (gnu compiler) that I use a lot. But stick to Visual C++ since you already have it. It is very very good! (make sure you install the latest service packs from microsoft ... I think the latest is SP5. They fix a lot of bugs with the compiler). You can download Service Pack 5 from HERE (it's about 130MB) .

[ February 22, 2002: Message edited by: Sip ]

Harut · February 23, 2002

ok, here is what i want to do.

i have a combo box, style = simple combo.

it contains a lot of names.

let's say:

"Azat"

"Garo"

"Gnel"

"Harut"

"Movses"

"Sip"

they are sorted.

now, when the user type the first letter, let's say "G", then the first name with "G" gets selected in the list portion, which is in this case "Garo".

if user types "n" next, then "Gnel" should get selected.

and so on.

Harut · February 23, 2002

quote:

Originally posted by Garo:

What is the purpose of this sub?
There are 2 ways to make an item selected
1. listbox has a property that stores the selected item's index. you can change this property and assign the correct value.
2. list items have boolean property 'selected' which is true for the selected item. Assign true to that item's 'selected' property and it'll become selected.

I'm not sure about the exact syntax in VB.

yes el hents et "Selected" propertyn em uzuzum gtnem chem karoghanum.
i guess there is no such a thing in VB.

Harut · February 23, 2002

quote:

Originally posted by Sip:

That Dietel and Dietel book is excellent. That's also the same one UCLA uses to teach intro to C/C++.

Visual Studio 6 is the best development environment ever made! Microsoft's C/C++ compiler is also very good.

C and C++ should be the same as long as you stick to the ANSI standards. ANSI C is very well defined but C++ is still being changed. New features are being added and removed and some compilers may or may not support some features. However, almost all compilers support the basic stuff so your choice of compiler will not make a difference.

The only thing is that don't confuse development environment and compiler. Visual Studio can make it seem like everything is integrated together but the complier is a separate program. Microsoft's 32-bit C/C++ compiler is called cl and you can use it to compile programs without using the Visual studio environment.

Although most people will use the Visual C++ environment to work on their programs (somewhat like how you would work on a visual basic program). But at the end, CL is compiling your code into an executable.

There are other compilers like GCC (gnu compiler) that I use a lot. But stick to Visual C++ since you already have it. It is very very good! (make sure you install the latest service packs from microsoft ... I think the latest is SP5. They fix a lot of bugs with the compiler). You can download Service Pack 5 from HERE (it's about 130MB) .

[ February 22, 2002: Message edited by: Sip ]

thanks Sip.

i have been downloading that thing you are talking about for 4 months now.
i reach 15% mark finally.

Sip · February 23, 2002

Harut jan,

I just wrote this code which I think does what you are asking. Just copy-paste it code into a text file, call it something like list.frm, and open and run it in VB.

It basically lets you add items to a list, and then select either the next item or the previous item. Is this the "select" you are asking about?

code:

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   1890
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   3210
   LinkTopic       =   "Form1"
   ScaleHeight     =   1890
   ScaleWidth      =   3210
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command3 
      Caption         =   "Select Prev"
      Height          =   495
      Index           =   0
      Left            =   1680
      TabIndex        =   3
      Top             =   1320
      Width           =   1455
   End
   Begin VB.CommandButton Command2 
      Caption         =   "Select Next"
      Height          =   495
      Left            =   1680
      TabIndex        =   2
      Top             =   720
      Width           =   1455
   End
   Begin VB.CommandButton Command1 
      Caption         =   "Add Items"
      Height          =   495
      Left            =   1680
      TabIndex        =   1
      Top             =   120
      Width           =   1455
   End
   Begin VB.ListBox List1 
      Height          =   1620
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   1455
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
newItem$ = "Item " + Str(List1.ListCount + 1)
List1.AddItem (newItem$)
End Sub
 
Private Sub Command2_Click()
If List1.ListCount > 0 Then
    sel = List1.ListIndex
    sel = sel + 1
    If sel >= List1.ListCount Then sel = 0
    List1.Selected(sel) = True
End If
End Sub
Private Sub Command3_Click(Index As Integer)
If List1.ListCount > 0 Then
    sel = List1.ListIndex
    sel = sel - 1
    If sel < 0 Then sel = List1.ListCount - 1
    List1.Selected(sel) = True
End If
End Sub

Harut · February 24, 2002

Sip jan, that wasn't quite what i wanted but it helped me see how the Selected property works.

now i think i know how to do what i wanted to do. so i'll post it to show you shortly.

Harut · February 24, 2002

ok guys i found it!!!

here is what i wanted to do so long.

this time i used a text box and a list box.

before i was using a simple como box, but unfortunatly it doesn't support the Selected property. .

anyways. i guess i have to use separate text box and a list box.

thanks for your help people.

quote:

VERSION 5.00

Begin VB.Form Form2

Caption = "Form2"

ClientHeight = 1920

ClientLeft = 60

ClientTop = 345

ClientWidth = 3855

LinkTopic = "Form2"

ScaleHeight = 1920

ScaleWidth = 3855

StartUpPosition = 3 'Windows Default

Begin VB.ListBox lstTest

Height = 1230

ItemData = "Form2.frx":0000

Left = 120

List = "Form2.frx":001F

TabIndex = 1

Top = 600

Width = 3615

End

Begin VB.TextBox txtTest

Height = 285

Left = 120

TabIndex = 0

Top = 120

Width = 3615

End

Attribute VB_Name = "Form2"

Attribute VB_GlobalNameSpace = False

Attribute VB_Creatable = False

Attribute VB_PredeclaredId = True

Attribute VB_Exposed = False

Private Sub txtTest_Change()

Dim I As Integer

Dim L As Integer

L = Len(txtTest.Text)

For I = lstTest.ListCount - 1 To 0 Step -1

If LCase(txtTest.Text) = LCase(Left(lstTest.List(I), L)) Then

lstTest.Selected(I) = True

End If

Next I

End Sub

Garo · February 24, 2002

quote:

Originally posted by Harut:
ok guys i found it!!!

here is what i wanted to do so long.
this time i used a text box and a list box.
before i was using a simple como box, but unfortunatly it doesn't support the Selected property. .
anyways. i guess i have to use separate text box and a list box.

thanks for your help people.

To make an item selected in combobox you use its TextColumn property.
From the VB help file:
When the user selects a row, the Text property of the control is set to the value of the column identified by the TextColumn property. In a combo box, the system displays the column designated by the TextColumn property in the text box portion of the control.

Azat · February 25, 2002

Harut,

Sorry for the late reply.

The ".Text" property of the combo box will give you the item that is currently selected.

Also I think what you are trying to accomplish can easily be done by just changing the combo box "style" property to a dropdown list. One warning, when it is a list you cannot add new items to your list, you have to do it programmatically.

Hope that helps.

Azat

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