Multiple Starting Values, Ending Values and Step Values in Looping Constructs for Structured Programming Languages

Posted by Rey Dacoco in

For starters, loop is a repetition structure that enables your program to execute the same statement(s) over and over and over and over and over again.There are several looping constructs that can be used for structured languages such as for, while,do-while,while-until and do-until. It's just so sad that most books showed us to use those statements by using only a single starting value,an ending value, and counter which made us conclude that it isn't possible to use compound loop elements.But did you know that you can use several initializations,loop conditions, and starting values in any looping constructs? You heard me right my friend. Here's how.

Syntax:

startingvalue1;
startingvalue2;
startingvaluen;
while((endingvalue1)&&(endingvalue2)&&(endingvaluen))
{
statement1;
statement2;
statementn;
stepvalue1;
stepvalue2;
stepvaluen;
}
For the sake of example I will be using while statement in PHP.

Example:
<?php
$intcount1=1;
$intcount2=10;
$intcount3=21;
while(($incount1<=10)&&($intcout2>=1)&&($intcount3<=30))
{
echo "$intnum1 $intnum2 $intnum3 
";
$intcount1++;
$intcount2--;
$intcount3++;
}
?>
The script above produces the following outputs:

1 10 21
2 9 22
3 8 23
4 7 24
5 6 25
6 5 26
7 4 27
8 3 28
9 2 29
10 1 30

You can use this as a good alternative for nested loops. Or if you wanted to hit several birds in one stone, that is, several outputs in one looping statement.

Changing the Background and Static Text Color of your MFC Dialog box

Posted by Rey Dacoco in

By default, VC++ doesn’t have a backcolor or forecolor control properties unlike other visual programming languages such as VB or VFP. But you can change the dialog box text and back color by following these simple steps.

1. Start VC++ by clicking the start button>All Programs>Microsoft Visual Studio 6.0> Microsoft Visual C++ 6.0.
2. Click File>New>Select MFC AppWizard (exe)>Type the Project name>Click Ok>Select Dialog based>Click Finish.
3. Right click your dialog box>In the Class name list box>Select CprojectnameAPP>Double click the InitInstance member function.

The following codes will appear:

CBkColorApp theApp;
/////////////////////////////////////////////////////////////////////////////
// CBkApp initialization
BOOL CBkColorApp::InitInstance()
{
AfxEnableControlContainer();

// Standard initialization
// If you are not using these features and wish to reduce the size
// of your final executable, you should remove from the following
//  the specific initialization routines you do not need.

#ifdef _AFXDLL
Enable3dControls(); // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic();// Call this when linking to MFC statically
#endif
4. Type the following before or after the line AfxEnableControlContainer(). Change the numbers inside the oval brace to create different background or text colors.
SetDialogBkColor(RGB(255,255,255),RGB(255,255,255));
5. The first RGB is for the backcolor and the other one is for the text.
6. Click the run icon to view the result.

Adding Colors to you C++ Program Output

Posted by Rey Dacoco in

There are several methods that can be used to add colors to your C++ program output but the simplest way is by using the system function. The system function allows you to pass commands to the operating system for execution. The syntax of using system varies in different programming languages. In C++, system function takes the following syntax:

system(“command”);
example:

system(“logoff”);
To add a color to your program output, use the color command which has the following syntax:

color bf
Were b is the background and f is the foreground.
Available colors for background and foreground are as follows:

0 = Black
1 = Blue
2 = Green
3 = Aqua
4 = Red
5 = Purple
6 = Yellow
7 = White
8 = Gray
9 = Light Blue
A = Light Green
B = Light Aqua
C = Light Red
D = Light Purple
E = Light Yellow
F = Bright White
So if you want to have a black background with light green text, use:

system(“color oa”);

system function is typed inside your main function (or inside other functions) just after the opening curly brace and before the closing curly brace.

example:
#include<iostream>
using namespace std;
int main()
{
system(“Color 0a”);
cout<<”I am blue”;
cin.get();
}

The codes above produce a red text in black background. There are several things that you can do with the system function, and it’s up to you to discover. Good luck!

Viewing the Control Toolbox in Microsoft Visual C++ 6.0 MFC

Posted by Rey Dacoco in

Unlike other application and development tools, Visual C++ does not permit viewing some of its Integrated Development Environment (IDE) components such as dialog box or control toolbox using the View menu. Unintentionally closing an IDE component could result to total disarray. To show one of its important components, the Control toolbox, use any of the following methods:

Method 1:

1. Right-click an empty pane in the Microsoft Visual C++ toolbar. A pop-up menu containing several options will be displayed>Select Controls option.

Note: The Controls option only appears on the pop-up menu if your dialog-based application is shown on the screen. If you dialog-box is hidden, click the resource tab on the right pane of you Visual C++ IDE> Expand the Dialog tree control item>Double-click IDD_Nameofyouproject_DIALOG.

Or

Method 2:

1. Click on the tools menu>Customize>Click the toolbars tab.

2. Check Controls from the toolbars list box>Click the close button.

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