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ProgrammingInformation system Design and Implementation
Chapter 6
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Outline
What is computer programming
Programming languages
Pseudo code
Software programming as a career
Test your programming ability
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Computer programming
Brief definition:
Writing instructions for computers to follow and run aprogram based on those instruction.
Art or engineering?
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Computer programming
1010100100101111010101010101
add $5, $7, $8 #comment
x = 5 + 8;
String stupid = You are not smart;
Machine code
Assembly language
High levellanguage
(Third generation)
compiler
assembler
execute
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Computer programming
Programmer focus on:
How each little pieces run
Write lines of code for each functions relatively
Write all little lines of code that enable the wholeprogram runs.
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Programming languages
Definition:
A programming language is an artificial languagedesigned to communicate instructions to a machine,
particularly a computer. Programming languages can beused to create programs that control the behavior of amachine and/or to express algorithms precisely.
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Programming languageHistory:
1983: C++
1987: Perl
1991: Python
1995: Java (highestdemand)
1995: Javascript
1995: PHP
1995: Ruby (lowestdemand)
2001: C#
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Elements ofprogramming language
Variables / objects:Store the pieces of data that a program is working onExpressions
Compute new values from old onesAssignmentsStore values into variablesConditionals
be used to determine whether some condition is trueTypes (of variables / expression)indicating the nature of the expected values.
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Elements of
programming languageStatementscontain instructions describing what a programactually does
Control flowconstructs which determine what order statementsare performed inFunctions
An entire set of statements, declarations, and controlflow constructs can be lumped together intoProgramA set of functions, global variables, and otherelements.
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Which language?
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Which language?
PHPFrameworks:-Prado
-QPHP-Symfony-Zend-CakePHP-
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Which language?
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Which language?
JavaFrameworks:-Wicket (Apache)
-Struts2 (Apache)-Spring MVC(SpringSource)-Stripes (Mc4j)-GWT (google)-Java Server Face (Sun
Microsystems)
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Which language?
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Which language?
C++
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Which language?
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Which language?
C#
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Pseudo codeA compact and informal high-level description of theoperating principle of a computer program or otheralgorithm.
Uses the structural convention of a programminglanguage, but is intened for human reading ratherthan machine reading.
Omits details that are not essential for human
understanding of the algorithm (eg: variabledeclarations)
No standard for pseudocode syntax exists, as aprogram in pseudocode is not an executable
program
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Pseudo code- Variable declarations are typically
omitted.
- Function calls and blocks of code, for
example code contained within a loop,
is often replaced by a one-line natural
language sentence.
- Depending on the writer, pseudo code
may therefore vary widely in style, from
a near-exact imitation of a real
programming language at one extreme,
to a description approaching formatted
prose at the other.
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Software programmingas a career
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Programmer or not?
Video files URL:
http://www.youtube.com/watch?v=H4TqAgAllnk&featur
e=related
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Positive thing Negative side
Salary Global competition
Skills and experiences Must keep yourself up-to-date
Work anywhere
Comfortable environment Age bias
Enjoy computer daily No fixed spare time
