Tadaaaa
:
http://www.whatis.com
PROGRAMMING LANGUAGE GENERATIONS:
In the computer industry, these abbreviations are
widely used to represent major steps or "generations"
in the evolution of programming languages.
1GL or first-generation language was (and still is)
machine language or the level of instructions and data
that the processor is actually given to work on (which in
conventional computers is a string of 0s and 1s).
2GL or second-generation language is assembler
(sometimes called "assembly") language. A typical 2GL
instruction looks like this:
An assembler converts the assembler language statements
into machine language.
3GL or third-generation language is a "high-level"
programming language, such as PL/I, C, or Java. Java
language statements look like this:
code:
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| public boolean handleEvent (Event evt) {
switch (evt.id) {
case Event.ACTION_EVENT: {
if ("Try me" .equald(evt.arg)) { |
A compiler converts the statements of a specific high-
level programming language into machine language. (In the
case of Java, the output is called bytecode, which is
converted into appropriate machine language by a Java
virtual machine that runs as part of an operating system
platform.) A 3GL language requires a considerable amount
of programming knowledge.
4GL or fourth-generation language is designed to be
closer to natural language than a 3GL language. Languages
for accessing databases are often described as 4GLs. A 4GL
language statement might look like this:
code:
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| EXTRACT ALL CUSTOMERS WHERE "PREVIOUS PURCHASES" TOTAL
MORE THAN $1000 |
or fifth-generation language is programming
that uses a visual or graphical development interface to
create source language that is usually compiled with a 3GL
or 4GL language compiler. Microsoft, Borland, IBM, and
other companies make 5GL visual programming products for
developing applications in Java, for example. Visual
programming allows you to easily envision object-oriented
programming class hierarchies and drag icons to assemble
program components.
Tot uw dienst
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