In pre-standard C, I/O operations were based on the Unix APIs. Instead of FILE pointers and functions such as fopen(), fread(), and fclose() that are defined in the header, Unix

The Standard Library doesn’t have a function for rounding floating point variables. However, you can easily round numbers as follows: double d=42.666;int rounded=d+0.5; // rounded = 43d=rounded; // d is

Tool tips are handy for providing explanations for buttons and other fixed components in a panel. Sometimes, it

In Web based programming, we usually check querystring parameters in middle tier java objects and do tedious, if not long, checks via if/else, to perform appropriate action or instantiate classes.

The secret lies in the Runtime class. Runtime contains the methodexec, which takes the basic form of: Process exec(String command) orProcess exec(String[] comdarray) orProcess exec(String[] cmdarray, String[] envp, File dir)

A typical HTML page might contain text fields to send data to the server. The data is submitted by clicking the submit button on the Web page. The browser then

The following function returns the extension of the filename that is being passed to it. It also takes into account the facts that a filename can include multiple

It’s faster to retrieve the length of a string and compare the value to zero than it is to compare it to an empty string. This is especially useful in

There are various problems regarding pointers that can be handled with the help of macros. Some of these problems are: deleting dangling pointers, deleting pointers other than NULL, and checking

Sometimes, you may need to make a Frame or JFrame non resizable. This happens especially when you are using the setBounds method or if you have less components in your

How many times do we add

Most web sites heavily rely on client-side cookies. For example, ASP Sessions can work correctly only if the browser allows temporary cookies (that are not stored on disk). ASP doesn’t

‘ Add or remove a program to the list of applications that will’ be automatically launched when Windows boots.” Action can be:’ 0 = delete from list’ 1 = execute

‘ get the description of a file from the registry’ or a null string if the file’s extension isn’t registered” NOTE: requires the GetRegistrtValue functionFunction GetFileDescriptionFromReg(ByVal FileName As String) As

Private Declare Sub SHChangeNotify Lib “shell32.dll” (ByVal wEventId As Long, _ ByVal uFlags As Long, ByVal dwItem1 As Long, ByVal dwItem2 As Long)Const SHCNE_ASSOCCHANGED = &H8000000Const SHCNF_IDLIST = 0′ Destroy

Const HKEY_LOCAL_MACHINE = &H80000002′ modify the value of a setting for the VBA editor from the Registry” Possible values for SettingName are:’ AutoQuickTips2 (0/1)’ AutoStatement2 (0/1)’ AutoValueTips2 (0/1)’ BackGroundCompile (0/1)’

Private Declare Sub SHChangeNotify Lib “shell32.dll” (ByVal wEventId As Long, _ ByVal uFlags As Long, ByVal dwItem1 As Long, ByVal dwItem2 As Long)Const SHCNE_ASSOCCHANGED = &H8000000Const SHCNF_IDLIST = 0′ Create

Const HKEY_LOCAL_MACHINE = &H80000002′ read the value of a setting for the VBA editor from the Registry” Possible values for SettingName are:’ AutoQuickTips2 (0/1)’ AutoStatement2 (0/1)’ AutoValueTips2 (0/1)’ BackGroundCompile (0/1)’

Internet Information Server introduced the notion “Isolation Level”, which is also present in IIS4 under a different name. IIS5 supports three isolation levels, that you can set from the Home

Many compilers have a special switch for precompiled headers. A precompiled header is a binary file containing intermediate code that is the result of preprocessing and compiling an ordinary header

A link-time error such as the following is rather common:

Different objects of the same class can access each other’s members, even if these members are private. For example: class A{ int n;public: void f(A* p) {p->n=0;}// another object’s private

Can you tell the difference between the following function calls? f(a,b);g((a,b)); // how many arguments are being passed to g? In the first example, the function f() is called with

Due to hardware limitations and the finite nature of computer arithmetic, certain numeric values cannot be represented properly. These values include infinity, negative infinity, and so on. The limits of

This is a routine for returning the correct file extensions catering to allpossible input values. ‘ Enhanced routine to return correct extension” Input Output Description’ —– —— ———–”

To retrieve drive names from a system, use the static method listRoots in java.io.File package. It will return the all-available drive present in the system. This method will be useful

If you insert/update/delete multiple times to the database, you canimprove performance by using the addbatch and executebatch methods of statement objects. One drawback about using this method is that it