In this slide ,i have explained the general structure of a simple c++ code and its description of every line of the code

1. General structure of a c++ program :
#include <iostream>
using namespace std;
int main() {
cout << "This is a simple C++ program!" << endl;
}
1. #include <iostream>
This line is a preprocessing directive. All preprocessing directives within
C ++ source code begin with a # symbol. This one directs the preprocessor to
add some predefined source code to our existing source code before the
compiler begins to process it. This process is done automatically.
IOSTREAM :
IOSTREAM library, a collection of precompiled C ++ code that C ++
programs (like ours) can use. The iostream library contains routines that
handle input and output (I/O) that include functions such as printing to the
display, getting user input from the keyboard. These items, along with many
other things related to input and output, were developed in C ++ , compiled and
stored in the iostream library.
The #include directive specifies a file, called a header that contains the
specifications for the library code. The compiler checks how we use cout and
endl within our code against the specifications in the <iostream> header to

2. ensure that we are using the library code correctly.
2. Using namespace std ;
This using namespace directive will allow us to omit , from writing the
longer name std::cout and std::endl instead we can write directly as cout and
endl.It's not mandatory to use this statement in every program.It makes
simple and easy to use the shorter names(cout,endl..etc).
3. int main() {
This specifies the real beginning of our program. Here we are declaring a
function named main. All C ++ programs must contain this function to be
executable.
Most of them are thinking why we have to use int as return for main
function..? Here is answer for u r doubt.
The return value from the main function is used by the run time library as
the exit code for the process. Both Unix and Windows support a concept of a
integer returned from a process after it has finished.
The body of the main function does not need to contain the return
statement , if control reaches the end of main without encountering a return
statement , the effect is that of executing the return 0 ; Execution of the
return ( or the implicit return upon reaching the end of main) is equivalent
to first leaving the function normally (which destroys the objects with
automatic storage duration) and then calling std::exit with the same
argument as the argument of the return ( std::exit then destroys static
objects and terminates the program).

3. The opening curly brace represents the begining of the body of the
function.
4. cout << "This is a simple C++ program!"<< endl;
The body of our main function contains only one statement. This
statement directs the executing program to print the message “This is a
simple C++ program!” on the screen. A statement is the fundamental unit
of execution in a C ++ program.All statements in C ++ end with a
semicolon ;
5. }
The closing curly brace marks the end of the body of a function. Both
the open curly brace and close curly brace are required for every function
definition.
FOR REFERENCES :
http://comsciguide.blogspot.in/2014/12/p-margin-bottom-0.html