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C/C++ header file inlcude "" OR<> how to use std ?



Suppose your project current directory is

0.   /home/myproj/

Let assume include foder are


1. /home/include1/
2. /home/include2/

==>  # include "myhead.h"
   search for directory in order 0 , then 1 , then 2

AS IT SEARCH CURRENT DIR FIRST, USUALLY user defined headers used in this way.

==>  # include
   search for directory in order 1 , then 2 , then 0

AS IT SEARCH INCLUDE DIR FIRST,  standard headers used in this way.

Header file extension:
==================
In C : In early days it was .hxx, .hpp . Then it was .h

    #include myheader.hxx
    #include myheader.hp
    #include myheader.hpp

In C++ : No extension. They are included in namespaces.

   #include
   using namespace std; // use original namespace

you can also use it in code as std::stringfunction

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