[[TOC]]

,,'''Note''': This is not pretended to be a Howto, also not really ''public'', it is just a page that i have used to take some notes of a interesting book of C that im reading, you are allowed to edit and correct this document if you see anything wrong, also order it a bit or made it better, but this not pretends to be a ''big'' document so try to maintain it compact. Thanks,, 
----

== Comments == 

The comments are very important for yourself basically, you need to comment all your functions and declarations, and specially you need to comment your variables in order to know *what* exactly they are, and also for know possible special things of these variables

It is recommended to learn how works '''doxygen''' (5 minutes reading a howto in google, it is very basic) so that you can know special techniques to comment your source code that then you can build ''documentation'' of your API/source directly from these comments

The special things that you need to have in mind when you code is: clarity of code, simplicity, and summary


== Basic Things ==

To declare a string in a variable, you need to use strcpy, so
{{{
#!C
   name = "Me";   /* Illegal */
   strcpy (name, "Me");    /* Legal */
}}}

When you assign a single character you need to enclose it in single-quotes ', if you want to assign a string (with the end-of-string (NULL) char included), you need to use double-quotes ".


A good way to remove the newline value from variables (when you use a input-line entry system) is by simply set the end-of-string (NULL) value to the newline place, like:
{{{
#!C
   fgets(first, sizeof(first), stdin);
   first[strlen(first)-1] = '\0';
}}}
Remember that a string contains first a newline (if the input has included a newline) and all the strings finishes by the '\0' (NULL) character

== Arrays ==

A two dimensional matrix looks like: 
{{{
#!C
   mtrx_var[2][4];
}}}

Notice that this form is illegal: 
{{{
#!C
   mtrx_var[2,4];
}}}

This is also valid:
{{{
#!C
   int mtrx_var[2][4] = 
       {
          {1, 2, 3, 4},
          {10, 20, 30, 40}
       };
}}}


== Variables ==

signed: means ''with sign'', so, values negative and positive, for example if the '''char''' variable has a limit of 255 values, using the '''sign''' mode we can use from '''-128''' (negative) to '''127''' (positive), and using '''unsigned''' we can use from '''0''' to '''255'''

The '''constant''' variables are constants, so they can't change, by convention they are in upper-case