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DATE 2010-02-01

HANGOUT

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Key: Value:

Key: Value:

MESSAGE
DATE 2010-02-14
FROM Ruben Safir
SUBJECT Re: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics


Data Assignments in C++ Statements:

We've now bootstrapped enough background information in order to examine
data assignment and variables in C++ statements, and to compile small
programs to explore C++ data better.

C and C++ are know as compiled typed languages. What this means is that
the C source code itself does not directly run a program, unlike
scripting languages like Perl, Python, Rudy, Bourn Shell Scripting and
such. The program has to be compiled, linked with standard library
binary libraries, and outputted into a binary file that the machine and
operating system can run.

The TYPED aspect of C++ means that all variables have to be defined as
some specific data type, one of the data types such as we discussed
earlier (such as int, char, short, long, double, float). Functions and
Methods are data and have a type. Its a code type. But for the
purposes of Syntax they are typed according to the kind of data that
they return.


When we create variables in C and C++ they have to be typed. In
addition, there is 3 phases in variable creation, which can be either in
separate statements of combined into one statement. The three phases
are:

Declaration
Definition (needed for functions and methods)
Initialization


We declare a variable using the name and its type, its symbol and is
initializing it, we include an assignment of data. For example:


int i;

declares a variable i which is of type int, and most usually defines it.

float j;

declares a variable j of type float, as it is defined specifically to
your architecture and environment. We can then assign an integer to i
and a float to j using the following syntax.



#include
using namespace std;

int i;
float j; //Declarations of variables


int main(int argv, char * argc[])
{

i = 10;
j = 5.6;

return 0;
}




Now here is the catch. WHEN WE DECLARE A VARIABLE in an ordinary
C++ coding file, one that has the function main within it, placing the
variable in the global namespace above or outside of the "main"
function, then we are defining and declaring the variable and the
variable exists globally for your program, from the point that the
variable is declare on to the end of the file, and all the other
functions and code that you bring into your program from that point
forward. However, it is normal for real programming for one to use at
least three files for your program. Your main C++ code file, your
library source file which is used to create reusable objects in your
code base, and then finally, in HEADER files, the .h files that are
imported with

#ifndef MYOWNLIB
#include "myownlibrary"
#define MYOWNLIB
#endif

statements.

However, it is a programming error to ***define*** variables within your
headers. It can confuse the linker, because then they compiler will
make space for all the defined variables in every object that uses the
header file in your program, and all those objects may not agree as
to their values later on. So you want to declare it, so that everyone
knows what the common type and symbol is, but you don't want to define
it, so that the linker doesn't come along and fill in all those
definitions, possibly incorrectly, and separately if not independently,
in all the objects of your complex program. In order to allow for the
declaration without the definition of a variable in the header file, you
must use the "extern" keyword in header files to create proper global
scope of variables.

This is not true with functions or classes, which we will see later.
They have implicit "extern"s.


To beat a dead horse, since this is one of the most common areas of
programming bugs, understand this:

Where we declare a variable is important and determines where your
variable is viewable in your program. Complex programs have so many
variables in them that it is critical to try to restrict their access
and usage to the smallest subset of need as practical. This is
accomplished through two mechanisms, Scope and Namespace. We've seen
namespace already with the using directive

using namespace std;

imports into our section of programming all the reserved symbols of the
standard namespace. Scope, on the other hand, restricts variable access
to specific blocks of our programs, not just the symbols. When we
declare our variables outside of main, as we did in the program
file1.cc, then the scope is considered to be global and the variables i
and j are available throughout our program.

Scope is a bit more complex We've looked at global scope already and we
will run up against it time and again. According to Lippman there are
three
kinds of Scope: local, namespace and class. Scope in C++ is fairly
complicated, and not well described in the standard texts. Anywhere you
have a block you can declare and define variables, and they are local to
that block. This is particularly important in functions. A block is a
group of statements which are surrounded by curly braces. Like the unix
shell, a block inherits the variables in its scope from the name space
it is called from, including blocks that wrap it. So you can have
blocks within blocks. If you declare a variable already in play, it
creates a new temporary version of that variable. Variables in
functions, while they might be declared outside the function, and
defined within a function, would be created by the compiler, but don't
become active until they are called. Each function creates a stack of
runtime processes. The top most process, ignoring threading and forked
processes for the moment, needs to run its course and end prior to
calling function can continue. Since everything begins with a function
called main, a runtime stack might look like this, each platter on the
stack having its own unique environment and variables scoped within,
excluding global variables which they can affect and see.





function2
|
function1-------|
|
main ---|


In this scenario, when function2 finishes, all of its local variables
die and no long exist in runtime, and control returns back to function1.
function1 can then call function3, and add new plates to the runtime
stack. We will explore this more when we look at functions and methods.


Now lets return to the representation of data in C++ and look at
programming examples.

I will now increasingly be showing example code on the NYLXS website
because of nice HTML tool in VIM that can show code in syntax color.
See http://www.nylxs.com/docs/workshops/?C=M;O=D for coding examples as
mentions here.

We can start by building a nice example program, which will have 4
working files, a header file, a main programming file, a library
programming file and a make file. There are easier ways of showing
these data type examples, but I feel it is important that new C and C++
programmer become comfortable and familiar with multiple file
programming projects, especially for C++. Also, I might mention a tip
or two with VIM and GVIM, in order to outline more general GNU tool sets
to help the C and C++ coder. There are also, no doubt, likewise
examples in EMACS and other editors, but I'm not going to mention them,
and I really don't want an editor war to break out in the workshop.



  1. 2010-02-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Michael George
  2. 2010-02-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] sddsfs
  3. 2010-02-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] The end of the future
  4. 2010-02-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] The end of the future
  5. 2010-02-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - Introduction
  6. 2010-02-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop I datatypes cont..
  7. 2010-02-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - Introduction
  8. 2010-02-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop I datatypes cont..
  9. 2010-02-02 From: "Beau Gould" <bg-at-capitalmarketsp.com> Subject: [NYLXS - HANGOUT] [JOB] Operations Manager, NYC | 120k+
  10. 2010-02-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] [JOB] Operations Manager, NYC | 120k+
  11. 2010-02-02 From: "Beau Gould" <bg-at-capitalmarketsp.com> RE: [NYLXS - HANGOUT] [JOB] Operations Manager, NYC | 120k+
  12. 2010-02-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop I datatypes cont..
  13. 2010-02-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop I datatypes cont..
  14. 2010-02-02 From: "Stan Davenport" <stan-at-etrtechcenter.com> RE: [NYLXS - HANGOUT] [JOB] Operations Manager, NYC | 120k+
  15. 2010-02-03 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop I datatypes cont..
  16. 2010-02-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Tech Nite
  17. 2010-02-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop I datatypes cont..
  18. 2010-02-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop I datatypes cont..
  19. 2010-02-05 Michael L Richardson <mlr52-at-michaellrichardson.com> Subject: [NYLXS - HANGOUT] Ruben
  20. 2010-02-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Ruben
  21. 2010-02-05 Paul Charles Leddy <pcleddy-at-gmail.com> Re: [NYLXS - HANGOUT] The new mail server
  22. 2010-02-06 Kevin Mark <kevin.mark-at-verizon.net> Re: [NYLXS - HANGOUT] Ruben
  23. 2010-02-06 Michael L Richardson <mlr52-at-michaellrichardson.com> Re: [NYLXS - HANGOUT] Ruben
  24. 2010-02-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Worlds most secure Operating System
  25. 2010-02-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] They are OUT OF PRINT stupid..
  26. 2010-02-07 Kevin Mark <kevin.mark-at-verizon.net> Re: [NYLXS - HANGOUT] Ruben
  27. 2010-02-07 Kevin Mark <kevin.mark-at-verizon.net> Re: [NYLXS - HANGOUT] Ruben
  28. 2010-02-07 Michael L Richardson <mlr52-at-michaellrichardson.com> Re: [NYLXS - HANGOUT] Ruben
  29. 2010-02-07 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] Ruben
  30. 2010-02-07 Michael L Richardson <mlr52-at-michaellrichardson.com> Re: [NYLXS - HANGOUT] Ruben
  31. 2010-02-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Copyright Criminals on PBS
  32. 2010-02-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics
  33. 2010-02-09 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Copyright Wars in Europe
  34. 2010-02-09 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Copyright Wars in Europe Part II
  35. 2010-02-09 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Security Alert
  36. 2010-02-09 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C Code for Android
  37. 2010-02-09 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics
  38. 2010-02-10 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics
  39. 2010-02-11 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Tech Night This Week
  40. 2010-02-11 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Downtown Brooklyn Tech Center
  41. 2010-02-12 Paul Charles Leddy <pcleddy-at-gmail.com> Re: [NYLXS - HANGOUT] Ruben
  42. 2010-02-12 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Tech Night This Week
  43. 2010-02-12 From: "Beau Gould" <bg-at-capitalmarketsp.com> Subject: [NYLXS - HANGOUT] [JOB] LAMP Developer, NYC | 90-100k
  44. 2010-02-12 From: "Beau Gould" <bg-at-capitalmarketsp.com> Subject: [NYLXS - HANGOUT] Hi Ruben
  45. 2010-02-12 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Hi Ruben
  46. 2010-02-12 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Hi Ruben
  47. 2010-02-12 From: "Beau Gould" <bg-at-capitalmarketsp.com> RE: [NYLXS - HANGOUT] Hi Ruben
  48. 2010-02-12 From: "Beau Gould" <bg-at-capitalmarketsp.com> RE: [NYLXS - HANGOUT] Hi Ruben
  49. 2010-02-12 Kevin Mark <kevin.mark-at-verizon.net> Re: [NYLXS - HANGOUT] Downtown Brooklyn Tech Center
  50. 2010-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - side discussing on C++ variable declarations
  51. 2010-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - side discussing on C++ variable declarations
  52. 2010-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - side discussing on C++ variable declarations
  53. 2010-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - side discussing on C++ variable declarations
  54. 2010-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - side discussing on C++ variable declarations
  55. 2010-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - side discussing on C++ variable declarations
  56. 2010-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - side discussing on C++ variable declarations
  57. 2010-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - side discussing on C++ variable declarations
  58. 2010-02-13 Contrarian <adrba-at-nyct.net> Re: [NYLXS - HANGOUT] Downtown Brooklyn Tech Center
  59. 2010-02-13 Contrarian <adrba-at-nyct.net> Re: [NYLXS - HANGOUT] Downtown Brooklyn Tech Center
  60. 2010-02-14 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics
  61. 2010-02-15 From: "Beau Gould" <bg-at-capitalmarketsp.com> Subject: [NYLXS - HANGOUT] A good friend of mine is looking for a job
  62. 2010-02-15 Ron <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society, (Smalltalk, C++, Python) TOMORROW February 16 6:00PM-8:00PM
  63. 2010-02-15 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society, (Smalltalk,
  64. 2010-02-15 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics
  65. 2010-02-16 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] [Fwd: [nylug-announce] NYLUG Presents: 2/17 -at- 6:30PM Luke Kanies
  66. 2010-02-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Re: Passing Tradition in the digital age
  67. 2010-02-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Senior Linux Engineer - Job Opportunity for NYLXS
  68. 2010-02-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Catching up to me
  69. 2010-02-16 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society, (Smalltalk, C++, Python) TODAY February 16 6:00PM-8:00PM
  70. 2010-02-16 From: "Beau Gould" <bg-at-capitalmarketsp.com> Subject: [NYLXS - HANGOUT] [JOB] 30 C++/Unix Programmers, NYC | to 200k or to $700/day
  71. 2010-02-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: [Linux.com.users] Ultimate Linux Guru Update
  72. 2010-02-16 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] [JOB] 30 C++/Unix Programmers, NYC | to 200k
  73. 2010-02-16 From: "Beau Gould" <bg-at-capitalmarketsp.com> RE: [NYLXS - HANGOUT] [JOB] 30 C++/Unix Programmers, NYC | to 200kor to $700/day
  74. 2010-02-16 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] [JOB] 30 C++/Unix Programmers, NYC | to
  75. 2010-02-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Amy
  76. 2010-02-16 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Amy
  77. 2010-02-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Technight - Sunday at 6:00PM till --- when ever
  78. 2010-02-17 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] Streaming LIVE: Luke Kanies on The Future of Puppet
  79. 2010-02-18 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: TM Insider: HAIR: The Best Musical of 2009 for just $55
  80. 2010-02-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Technight - Hacking and Ice Cast - this Sunday Evening
  81. 2010-02-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics
  82. 2010-02-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C Programming and Modern Approach question
  83. 2010-02-19 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] (live streaming) Free Software Round Table Saturday 2/20 at 10 PM
  84. 2010-02-19 Elfen Magix <elfen_magix-at-yahoo.com> Re: [NYLXS - HANGOUT] Technight - Hacking and Ice Cast - this Sunday Evening
  85. 2010-02-20 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] MS/Open SOurce Dejavu all over again
  86. 2010-02-20 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] (live streaming) Free Software Round TableSaturday in ONE HOUR (10
  87. 2010-02-20 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] (live streaming) Free Software Round
  88. 2010-02-20 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] (live streaming) Free Software Round TableSaturday
  89. 2010-02-22 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [ruben-at-mrbrklyn.com: [knking-at-gsu.edu: Re: C Programming and Modern
  90. 2010-02-22 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] IceCast Server
  91. 2010-02-23 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] DSL Router Virus
  92. 2010-02-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [NYLXS - HANGOUT] this should not get through
  93. 2010-02-24 Ruben Safir <ruben-at-mrbrklyn.com> Re: [NYLXS - HANGOUT] this should not get through
  94. 2010-02-24 Ruben Safir <ruben-at-mrbrklyn.com> Re: [NYLXS - HANGOUT] this should not get through
  95. 2010-02-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] The Only significant Issue in the Healthcare bill
  96. 2010-02-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] The Only significant Issue in the Healthcare
  97. 2010-02-24 Elfen Magix <elfen_magix-at-yahoo.com> Re: [NYLXS - HANGOUT] this should not get through
  98. 2010-02-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] this should not get through
  99. 2010-02-25 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] this should not get through
  100. 2010-02-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] this should not get through
  101. 2010-02-25 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] this should not get through
  102. 2010-02-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] this should not get through
  103. 2010-02-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] this should not get through
  104. 2010-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [FSF] Day Against DRM: May 4
  105. 2010-02-26 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] this should not get through
  106. 2010-02-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics - Aggregate Data Types

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