Symbolic language

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4 Νοε 2013 (πριν από 3 χρόνια και 9 μήνες)

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Symbolic language


Grace Hopper, a US Navy admiral, developed
the concept of using symbolic to replace
binary code.


Symbolic is easy to read and understand by
people.


A program do the translation of translating
symbolic language to machine language.


Quiz: what kind of language is used to
compose the translator program?


Example of symbolic
language



Disadvantages of symbolic
language


It is a machine
-
dependent language,
which means the grammar is different
from machine to machine.


Programmer

s productivity is low.


Assembly language is a symbolic
language


A

driver


program is often written by
assembly language.


High
-
level language


A high
-
level language is a portable language,
which means a program written by high
-
level
language can be executed on different
machines.


Fortran and Cobol are two popular high
-
level
language in early stages.


It must be translated into symbolic language
and then, in turn, be translated to machine
language. This translator program is called

compiler

.


Sample of high
-
level language

Building a c program

Execute a program

Script


HTML
-
Hypertext markup language


HTML is used to produce static Web
pages, which contain fixed content.


VBscript or Javascript allows to produce
dynamic web page ,which creates
interactivity to web pages.

Execute a script


Scripting language use a program called
INTERPRETER to translate the script
code into an executable format.


The interpreter of HTML or VBscript is
embedded in Web Browser.