Starting with Programming

To start with programming you should have compiler in your computer , you can download free open-source cross-platform IDE that supports multiple compilers such as codeblocks . I have provided the link below to download codeblocks and steps to install it , please check out :

http://www.codeblocks.org/downloads

Download the binary release for your operating platform ( Windows 2000/XP/Vista/7 ) and install it . If during installation no compiler is detected by your pc then download the installer with GCC Compiler, e.g., codeblocks-13.12mingw-setup.exe (98 MB) (which includes MinGW's GNU GCC compiler and GNU GDB debugger) .

After installation open codeblocks press Ctrl+Shift+N to open new file then first save it using keys Ctrl+S so that if you make any mistake small red square will be shown in the left side of the respective line . And use extension .cpp while saving the program .
Ex- my.cpp ( you can give any name but extension should be .cpp )

* Let's start with a simple program which display My first program as output :

after coding press F9 to get your output (if your program has no errors , if there are some errors it will get display below the screen along with the line number ) , lets see the output for this program :

This black screen (like cmd screen) represent successful operation and the output is printed on the top line.

Let's understand how it works line by line :

1.    #include<iostream>

C++ offers various headers, each of which contains information needed for programs to work              properly. This particular program calls for the header <iostream>.

It implements input/output facilities.

The number sign (#) at the beginning of a line targets the compiler's pre-processor. In this case,            #include tells the pre-processor to include the <iostream> header.

The <iostream> header defines the standard stream objects that input and output data.

  
2.    using namespace std;

• In our code, the line using namespace std; tells the compiler to use the std (standard) namespace.
• The std namespace includes features of the C++ Standard Library.

3.     int main( )

• int is a keyword .
• Always remember program execution begins with the main function, int main( ) .
• The entry point of every C++ program is main(), irrespective of what the program does.

4,8.     { } 

• Curly brackets { } indicate the beginning and end of a function, which can also be called the function's body. The information inside the brackets indicates what the function does when executed .

5.     cout<<"My first program";

• This line display the output in the screen .
• Here cout ( keyword ) is standard output stream .
• In C++, streams are used to perform input and output operations.
• In most program environments, the standard default output destination is the screen. In C++, cout is the stream object used to access it.
• cout is used in combination with the insertion operator. Write the insertion operator as << to insert the data that comes after it into the stream that comes before.
• To print anything in C++ use cout with insertion operator ( << ) and write anything in double quotes (" ") and terminate the line with semicolon . 
• In C++, the semicolon is used to terminate a statement. Each statement must end with a semicolon. It indicates the end of one logical expression.

6.     (black line)

• The C++ compiler ignores blank lines , so you can have as many you want.
• In general, blank lines serve to improve the code's readability and structure.
• Whitespace, such as spaces, tabs, and newlines, is also ignored, although it is used to enhance the program's visual attractiveness.

7.     return 0;

• return is a keyword.
• The last instruction in the program is the return statement. The line return 0; terminates the main() function and causes it to return the value 0 to the calling proces .
• If the return statement is left off, the C++ compiler implicitly inserts "return 0;" to the end of the main() function.

So here you learn to print a line in C++ , hope you understand . Remember to insert the first two starting line of coding without which your program will not work and also the main( ) function from where the program execution takes place, you can define the main( ) function anywhere in your program but here we do not have other functions so we define it in the beginning . Also remember to return an integer value for successful program execution .