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DATE 2010-02-01

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Key: Value:

Key: Value:

MESSAGE
DATE 2010-02-02
FROM Ruben Safir
SUBJECT Subject: [NYLXS - HANGOUT] C++ Workshop - Introduction
Conceptial Ideas:

In organizing the concepts of C++ which are being introduced we can view
each of them separately, but studying them it is essential to keep in
mind that they are designed to function together in the construction of
programs which are easier to debug, which allow for cleaner overall
syntax, and which encourage creation of reusable code.

We shall explore:

Data Types (build in and user created)

Pointers and References (and their subtle deference)

Manual Memory Allocation and the 'new' and delete keywords

Class Declaration

Class Definition

Private data

Public data

Object instantiation and access, Class typedef

Class Constructors

Class Destructor

Function or Method Overloading

Operator Overloading

External extension of definitions

Copy Constructors

at the end we'll try to actually make the example class, which is an
extended array.


1) Data Types: DATA DATA DATA, everything is DATA

As we know, C and C++ have built in data type which each variable and
object the language needs to be defined as. Both C and C++ are typed
language.

We have char, int, double, float, pointer, and so on, a complete list
of which is available around the net. A pointer stores an address of
another C++ object. Different hardware and software platforms also
have different sizes that it allocates for these data types, creating an
inconsistency which, as an aside, the Free Software community has tried
to address with the creation of the glib library, part of the GTK
project.

What is less apparent is that with regard to a computer, everything is
data. We have the data that we create and manipulated with
instructions, but the instructions themselves are a form data which we can package
up and save for later use, and feed to the CPU at will. When the CPU
runs out instructions the resulting actions are further instructions
that can be packaged and saved as data. In a word, everything is data,
and how we package that data is what separates one programming language
from the next.

This concept is covered extensively in NYLXS ?Introduction Programming
with Perl? class and since this is an advanced topic, we won't get
much further into this. But we will review the basics of data types and
then look at the new feature that C++ gives which C didn't have in such
a generous way, the ability to easily create new data types easily and
in a reusable fashion.

An integer in the C family on the 32 bit Intel clone architecture is
defined as a marked space in memory of 32 bits in size to represent both
positive and negitive numbers. On the new 64 bit architecture that many
of you might have, I don't know if this still holds true since the word
size of a those machines is 64 bits or 8 bytes.

when you use the declaration

int a = 3456;

The computer your program sets aside 32 bits, 4 bytes, of space in ram
and puts the binary representation of that value in that space. The leftmost
bit is usually the signed bit determining whether the number represented
within is either positive or negative. A signed integer can therefor
have a maximum value of 2,147,483,647 positive or negative. beyond that
you must use a long int, which on 32 bit architecture actually won't
help you, or to use external libraries with other data types defined.

By default, C allows certain syntax with a data typeis. It will
automatically translate it, for example, and on demand, into a char that will print
its representation for functions such as printf or in C++ the cout
object:

printf (?%d\n?, myint);
cout << myint;

It can be combined with operators it can be used with the assignment
operator to fill or initialize its space with data.

int myans,myx = 6,myy =12;

It can be combined with arithmetic operators and have results assigned
accordingly.

myans = myy + myx;

Two of them can be compared.

while (myy < myx){
... ...
}

They can be auto incremented

myy++; ++myy;

and so on....

One data type is actually a serial arraignment of data, that is an
array.

int myarray[100];

This defines an array of 100 elements indexed from zero to ninety-nine.

myy = myarray[4];

assigns the fifth element of our array to our integer variable myy.
One thing you can not do with an array data type is use an assignment
operator on the entire array object.







myarray[] = myarray2[]; //THIS IS AN ERROR

C++ allows up to define our own data types that have all the properties
of the built in ones. It uses the class mechanize, operator
overloading,
and the ?new? keyword to accomplish this.


2) Pointers and References ? Where did I PUT THAT!

When we create data for our program, we ask the program to insert memory
into RAM and to retrieve or assign the data from that memory location
for use. Internally the program keeps track of the symbols and the
memory locations. In fact is you run the program ?nm? on a C or C++
binary it will tell you all the symbols that it has in that binary.

ruben-at-www2:~/cplus> nm file3|less

0804a210 A __bss_start
08048a84 t call_gmon_start
0804a29c b completed.1
0804a0bc d __CTOR_END__
0804a0b4 d __CTOR_LIST__
U __cxa_atexit-at--at-GLIBC_2.1.3
0804a204 D __data_start
0804a204 W data_start
08048ed0 t __do_global_ctors_aux
08048ab0 t __do_global_dtors_aux
0804a208 D __dso_handle
......


But we can also create memory locations that are assignable, and store
a representation of that memory location directly into a variable that
only stores the memory location as data, not the data itself. In c
and C++ this is called pointers and we can use the following syntax to
create them.

int *pt = &myint;

This declares the pointer to an int variable called pt which stores the
address for myint. The syntax int * in a declaration (and ONLY in a
declaration) says make a pointer to an int. The & syntax in front of a
variable myint says don't return the value of the variable, but return
the address of the data stored in the variable itself.

There are functions that return only pointer data. Those functions make
it possible to access memory without the declaration of variables at
all.
There are also declarations that can be made in C and C++ which can
create variables without variable names either.

int (*pt)[10];

This declares a pointer (pt) to an array of 10 integers.

char (*p)[10][100]

This is a pointer which addresses an array of 10 pointers (implied)
to arrays of 100 chars each. Commonly this is know as a point to an
array of 10 strings. The symbolic variable name for an array often
gets automatically cast as a point type.

Most string functions in C return a char pointer for example

char * strtok(char *s1, const char *s2);

This would return an address of a char, which in theory would represent
an array of chars. In use it would look like this


char * spt; char wd1[100] = 'hello world', wd2[100] = ' ';

spt = strtok(wd1,wd2); printf(?%s\n?, spt);





Manual Memory Allocation and the 'new' and delete keywords

C++ makes it very convent to create dynamically allocated memory which
is accessed by pointers. We might call these anonymous pointers because
they do not point to any variables, just defined memory. We do this
with the key word ?new?.

int *pt = new int(124);

This creates a new int pointer called pt and assigns to the memory
pointed to by pt with the integer value 124.

delete pt;

deletes the anonymous pointer pt.

int *pt = new int[100];

This declaration creates a new int pointer to an array of 100 integers,
with no data assigned yet to that block of memory.

delete [] pt;

deletes the entire array pointed to by pt and then undefines pt.



Ruben
--
http://www.mrbrklyn.com - Interesting Stuff
http://www.nylxs.com - Leadership Development in Free Software

So many immigrant groups have swept through our town that Brooklyn, like
Atlantis, reaches mythological proportions in the mind of the world -
RI Safir 1998

http://fairuse.nylxs.com DRM is THEFT - We are the STAKEHOLDERS - RI
Safir 2002

"Yeah - I write Free Software...so SUE ME"

"The tremendous problem we face is that we are becoming sharecroppers to
our own cultural heritage -- we need the ability to participate in our
own society."

"> I'm an engineer. I choose the best tool for the job, politics be
damned.<
You must be a stupid engineer then, because politcs and technology have
been attached at the hip since the 1st dynasty in Ancient Egypt. I
guess you missed that one."

? Copyright for the Digital Millennium

  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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