• Dev C 2b 2b Header Files List Folder
• Dev C 2b 2b Header Files Lists

C Header Files and Libraries. In C, it is very common to have functionality defined in header files. Functions defined in header files can end up in all the objects that include those header files. If multiple libraries include the same header file, those functions can be defined in multiple libraries. C/C STANDARD LIBRARY Only the most commonly used functions are listed. Header files without.h are in namespace std. File names are actually lower case. Class declarations are stored in a separate file. A file that contains a class declaration is called header file. The name of the class is usually the same as the name of the class, with a.h extension. For example, the Time class would be declared in the file Time.h. To minimize the potential for errors, C has adopted the convention of using header files to contain declarations. You make the declarations in a header file, then use the #include directive in every.cpp file or other header file that requires that declaration.

So what I am trying to do is to have a header file which declares lists in it. Everytime I complie it, it does not know what a list is. Here is my header file called MergeSort.h Now I dont have everything from teh.ccp file in the.h file yet. I am trying to get the.h file to complie first.

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The C++ standard libraries provide an extensive set of input/output capabilities which we will see in subsequent chapters. This chapter will discuss very basic and most common I/O operations required for C++ programming.

C++ I/O occurs in streams, which are sequences of bytes. If bytes flow from a device like a keyboard, a disk drive, or a network connection etc. to main memory, this is called input operation and if bytes flow from main memory to a device like a display screen, a printer, a disk drive, or a network connection, etc., this is called output operation.

I/O Library Header Files

There are following header files important to C++ programs −

The Standard Output Stream (cout)

The predefined object cout is an instance of ostream class. The cout object is said to be 'connected to' the standard output device, which usually is the display screen. The cout is used in conjunction with the stream insertion operator, which is written as << which are two less than signs as shown in the following example.

When the above code is compiled and executed, it produces the following result −

The C++ compiler also determines the data type of variable to be output and selects the appropriate stream insertion operator to display the value. The << operator is overloaded to output data items of built-in types integer, float, double, strings and pointer values.

The insertion operator << may be used more than once in a single statement as shown above and endl is used to add a new-line at the end of the line.

The Standard Input Stream (cin)

The predefined object cin is an instance of istream class. The cin object is said to be attached to the standard input device, which usually is the keyboard. The cin is used in conjunction with the stream extraction operator, which is written as >> which are two greater than signs as shown in the following example.

When the above code is compiled and executed, it will prompt you to enter a name. You enter a value and then hit enter to see the following result −

Download dota 2 offline for android. The C++ compiler also determines the data type of the entered value and selects the appropriate stream extraction operator to extract the value and store it in the given variables.

The stream extraction operator >> may be used more than once in a single statement. To request more than one datum you can use the following −

This will be equivalent to the following two statements −

The Standard Error Stream (cerr)

The predefined object cerr is an instance of ostream class. The cerr object is said to be attached to the standard error device, which is also a display screen but the object cerr is un-buffered and each stream insertion to cerr causes its output to appear immediately.

The cerr is also used in conjunction with the stream insertion operator as shown in the following example.

When the above code is compiled and executed, it produces the following result −

The Standard Log Stream (clog)

The predefined object clog is an instance of ostream class. The clog object is said to be attached to the standard error device, which is also a display screen but the object clog is buffered. This means that each insertion to clog could cause its output to be held in a buffer until the buffer is filled or until the buffer is flushed.

The clog is also used in conjunction with the stream insertion operator as shown in the following example.

Dev C 2b 2b Header Files List Folder

When the above code is compiled and executed, it produces the following result −

Dev C 2b 2b Header Files Lists

You would not be able to see any difference in cout, cerr and clog with these small examples, but while writing and executing big programs the difference becomes obvious. So it is good practice to display error messages using cerr stream and while displaying other log messages then clog should be used.