Dev C++ Example Program Codes Pdf

1. C++ By Example Pdf
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Return may be followed by a return code (in our example is followed by the return code 0). A return code of 0 for the main function is generally interpreted as the program worked as expected without any errors during its execution. This is the most usual way to end a C console program. C Programming Examples. This page contains a collection examples on basic concepts of C programming like: loops, functions, pointers, structures etc. Feel free to use the source code on your system. Create Pyramid and Pattern. Check whether a number is prime or not. Find factorial of a number. Check whether a number is palindrome or not. While learning any programming language, practicing the language with examples will help you to understand the concepts better. We have collected the List of Frequently asked questions (FAQ code examples) in C programming. The list contain C language basic and simple source codes and examples.

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When we consider a C++ program, it can be defined as a collection of objects that communicate via invoking each other's methods. Let us now briefly look into what a class, object, methods, and instant variables mean.

• Object − Objects have states and behaviors. Example: A dog has states - color, name, breed as well as behaviors - wagging, barking, eating. An object is an instance of a class.

• Class − A class can be defined as a template/blueprint that describes the behaviors/states that object of its type support.

• Methods − A method is basically a behavior. A class can contain many methods. It is in methods where the logics are written, data is manipulated and all the actions are executed.

• Instance Variables − Each object has its unique set of instance variables. An object's state is created by the values assigned to these instance variables.

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C++ Program Structure

Let us look at a simple code that would print the words Hello World.

Let us look at the various parts of the above program −

• The C++ language defines several headers, which contain information that is either necessary or useful to your program. For this program, the header is needed.

• The line using namespace std; tells the compiler to use the std namespace. Namespaces are a relatively recent addition to C++.

• The next line '// main() is where program execution begins.' is a single-line comment available in C++. Single-line comments begin with // and stop at the end of the line.

• The line int main() is the main function where program execution begins.

• The next line cout << 'Hello World'; causes the message 'Hello World' to be displayed on the screen.

• The next line return 0; terminates main( )function and causes it to return the value 0 to the calling process.

Compile and Execute C++ Program

Let's look at how to save the file, compile and run the program. Please follow the steps given below −

• Open a text editor and add the code as above.

• Save the file as: hello.cpp

• Open a command prompt and go to the directory where you saved the file.

• Type 'g++ hello.cpp' and press enter to compile your code. If there are no errors in your code the command prompt will take you to the next line and would generate a.out executable file.

• Now, type 'a.out' to run your program.

• You will be able to see ' Hello World ' printed on the window.

Make sure that g++ is in your path and that you are running it in the directory containing file hello.cpp.

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You can compile C/C++ programs using makefile. For more details, you can check our 'Makefile Tutorial'.

Semicolons and Blocks in C++

In C++, the semicolon is a statement terminator. That is, each individual statement must be ended with a semicolon. It indicates the end of one logical entity.

For example, following are three different statements −

A block is a set of logically connected statements that are surrounded by opening and closing braces. For example −

C++ does not recognize the end of the line as a terminator. For this reason, it does not matter where you put a statement in a line. For example −

is the same as

C++ Identifiers

A C++ identifier is a name used to identify a variable, function, class, module, or any other user-defined item. An identifier starts with a letter A to Z or a to z or an underscore (_) followed by zero or more letters, underscores, and digits (0 to 9).

C++ does not allow punctuation characters such as @, $, and % within identifiers. C++ is a case-sensitive programming language. Thus, Manpower and manpower are two different identifiers in C++.

Here are some examples of acceptable identifiers −

C++ Keywords

The following list shows the reserved words in C++. These reserved words may not be used as constant or variable or any other identifier names.

Trigraphs

A few characters have an alternative representation, called a trigraph sequence. A trigraph is a three-character sequence that represents a single character and the sequence always starts with two question marks.

Trigraphs are expanded anywhere they appear, including within string literals and character literals, in comments, and in preprocessor directives.

Following are most frequently used trigraph sequences −

All the compilers do not support trigraphs and they are not advised to be used because of their confusing nature.

Whitespace in C++

A line containing only whitespace, possibly with a comment, is known as a blank line, and C++ compiler totally ignores it.

Whitespace is the term used in C++ to describe blanks, tabs, newline characters and comments. Whitespace separates one part of a statement from another and enables the compiler to identify where one element in a statement, such as int, ends and the next element begins.

Statement 1

In the above statement there must be at least one whitespace character (usually a space) between int and age for the compiler to be able to distinguish them.

Statement 2

In the above statement 2, no whitespace characters are necessary between fruit and =, or between = and apples, although you are free to include some if you wish for readability purpose.

Most common quiestion is:

Is there any C++ GUI API?

My answer is MANY.

There are many API's for making GUI applications.
Here are some.

1. WinAPI: (C based)(MFC is C++ based)
Its a great API and the best solution if you are windows programmer. First code will look a bit difficult, but later (after making few apps.) you will see its not so rusty. I like it, because you can do almost everything with it (in windows). The only bad thing is, that you cannot make applications for Linux with it.
Tutorial:
'>http://www.winprog.org/tutorial/index.html
2. Qt4 / Qt3 (C++ based)
This is a nice API, for making GUI applications. It works under Linux, Windows and Mac OS X. Its really easy to learn and use. But, until you dont buy licenced version, you will need to add tons of -dll s, to run your application. Qt compiler doesnt work in Vista. And, Qt4 API has a bit complicated way, to get buttons to work, if button holds some more complicated operations(actually you have to make your own SLOT's).
Tutorial:
http://sector.ynet.sk/qt4-tutorial/
http://doc.trolltech.com/4.2/examples.html
3.GTK+ (C based)
Sorry, but I never tryed it, so Google might help you.
Tutorial:
http://www.gtk.org/tutorial/

Some examples:

WinAPI
Simple message box:

Simple window:

QT4
Simple Message Box:

Note: Use MsgBox for making message boxes

Simple Window:

GTK+

Simple window:

I hope this post will help anyone!

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• commentLatest Postby sreenivasulaLatest Post

jan10241887

I also think newbies dont know for C++ IDE's. (Developing Enviroviment).

I will make a short description of some

C++ By Example Pdf

1. Visual Studio 2005 (Visual C++)
This is a beautiful IDE for making console and win32 GUI applications. You can also compile DirectX10 or 9 projects as well. I didn't test it for compiling Qt or GTK+ applications yet.
Affcourse as a Microsoft product isn't free, but it seems to be really safe and stable IDE for Windows Applications.
I really like it, and I recommend it to everyone.

More info '>HERE

2. Code::Blocks
Great for compiling WinAPI, Qt, GTK+, WXWidgets, Ogre, D, C++ console, C console and other projects. I found some bugs, and sometimes there are problems to compile.
It's one of the best FREE IDE's.

Information and download '>HERE

3. Dev-C++
This IDE, written in Delphi is the right place for beginners. It isn't perfect and it allows you 'holes' and 'bugs' in your program.Thats why its good for beginners. VS2005 wouldnt compile most of the code, which Dev-C++ does.

Information and Download '>HERE

SOME LINUX IDE's:
-Code::Blocks
-Anjuta IDE
-QDevelop

Ah, and dont take care about all off my opinions. I prefer VS2005, but If you dont have a money, than choose Code::Blocks or Dev-C++.

I hope moderators will make this topic sticky (read me)

I hope this helps

Dev C++ Program Download

BTW: Sorry for my grammatic mistakes.