meljun programming languages lecture

8/9/2019 MELJUN Programming Languages Lecture

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Programming Languages in SDD

Software Design and Development

MELJUN CORTES,BSCS,ACS


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Contents

2. Language requirements

1.Language Specifications

3. Event-driven languages

Course Specifications

NSW BOS Course Specifications

4. Prototyping & RAD

5. CPU simulation

6. Evolution - LOGIC

7. Developers view of Hardware


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Language Specifications

The syllabus does not prescribe a single coding language for

implementation of programs but advocates a range of high level languages.

Students are required to be proficient in using at least one of the currently

approved languages but will not be asked to interpret or produce code as

part of the external assessment.

The languages chosen for inclusion in the approved list are ones which are

generally available and support structured programming concepts.

Contents


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General language requirements

The programming language chosen must allow the students to:

use the following data types:

numeric (integer and real)

character string data

use record and array data types including multi-dimensional arrays

and arrays of records;

use simple variables of type:

CHARACTER

R

EAL

INTEGER

STRING

use meaningful identifiers;

use parentheses in creating expressions

Contents


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General language requirementscontinued


use the arithmetic operators of

ADDITION

SUBTRAC

TION MULTIPLICATION

DIVISION

use string handling operations to extract characters from a string

use the logical operators of AND

OR

NOT

Contents


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use relational operators which provide the equivalents of the following

functions:

use and create procedures which may require parameters: subprograms

subroutines

input data from the keyboard and/or a data file

write output to the screen and/or a data file

EQUAL TO NOT EQUAL TO

GREATER THAN GREATER THAN OR EQUAL TO

LESS THAN LESS LESS THAN OR EQUAL TO

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use selection statements equivalent to:

(i) IF-ELSE-ENDIF

IF TH

EN

ELSE

ENDIF

ii) CASE-ENDCASE

CASE OF

ENDCASE

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use repetition statements equivalent to:

(iii) REPEAT-UNTIL

REPEAT

UNTIL

(iv) WHILE-ENDWHILE

WHILE DO

ENDWHILE

(v) FOR-ENDFOR

FOR taking TO BY steps of 1 DO

ENDFOR

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include COMMENTS (REMARKS) in the code to document the program;

include the use of a debugging facility such as: single instruction stepping

trace

breakpoints

allow the reading and writing of sequential and random files

experience the use of both a compilerand an interpreter.

Appropriate Languages:

Pascal

a structured version of BASIC.

Contents


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Event-driven Languages


create scripts which respond to

button presses mouse actions

and make use ofstandard control structures

should not be limited to simple linking of screens.

Appropriate Languages:

Visual Basic

Hypercard

Delphi (limited functions only)

REALBasic.

Contents


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Prototyping and Rapid Applications Development


create several linked pages, cards or screens;

create graphic and text elements on the: pages

cards

screens

accept input from the keyboard;

store and access data;

perform mathematical operations on the data;

perform the following operations on the data

sorting searching

reporting

use a scripting language which permits the handling of system events such as mouse button presses

keystrokes

Appropriate languages: Visual Basic

Hypercard

Delphi (limited functions only)

Access

Filemaker-Pro

REALBasic

Contents


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Software used to simulate CPU

processing of instructions

The programming language chosen should allow the students to:

simulate the processing of machine code instructions.

Appropriate languages:

TIM

Under the Hood including a CPU simulation.

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Evolution of Programming Languages

Logic paradigm

Students should design and create a simple expert system using an expert

system shell, as an example of the logic paradigm.


enter simple IF-THEN rules

manipulate rules:

add

remove

edit

query the expert system

display the rules that the system used to reach a conclusion.

Appropriate software:

Eshell

ESIE

Clixpert

Prolog

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The Software Developers

view of the hardware

The software package(s) chosen must allow the students to:

Drag and drop logic gate symbols to create a circuit

Edit existing designs Print circuit designs

Simulate the working of designed circuits to show outputs for

selected input values.

Appropriate software:

LogicSim

LogicCircuits

Crocodile Clips

Contents

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