SS3 Second Term Computer Studies Lesson Note – High Level Languages

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WEEK 5.                                                       

TOPIC:     HIGH LEVEL LANGUAGES (HLL)

CONTENT:

(a) Definition of High-Level Language (H.L.L.)

(b) Examples of H.L.L. – BASIC, FORTRAN, ALGOL, C, PASCAL, PL/I, PROLOG, SNOBOL, COBOL.  (c) (i) BASIC, FORTRAN, ALGOL (Scientific) (ii) C, PASCAL, PL/I, (General purpose) (iii) LISP, PROLOG (Artificial intelligent (AI) (iv) SNOBOL Special purpose programming language (SPL)

DEFINITION OF HIGH-LEVEL LANGUAGE (H.L.L.)

A high-level programming language is a programming language with strong abstraction from the details of the computer. In comparison to low-level programming languages, it may use natural language elements, be easier to use, or may automate (or even hide entirely) significant areas of computing systems (e.g., memory management), making the process of developing a program simpler and more understandable relative to a lower-level language. The amount of abstraction provided defines how “high-level” a programming language is. Examples of high-level programming languages include FOCUS, Lisp, Perl, Python, and SAS.

Examples of H.L.L

• BASIC (Beginners All-purpose Symbolic Instruction code)
• FORTRAN (Formular Translation)
• ALGOL
• C
• PASCAL
• PL/I
• PROLOG
• SNOBOL
• COBOL (COmmon Business Oriented Language)

Scientific Language

This is the language that is used for scientific and engineering purposes. Examples include FORTRAN – Formula Translator, BASIC – Beginner All-purpose Symbolic Instruction Codes. It combines the features of the extensive arithmetic computational ability and the ability to handle mathematical expression.

Multi-Purpose

This type of high-level programming language can cope with a number of different types of application areas. Examples of multi-purpose language are Visual BASIC, PL/I C++, Java etc.

Commercial Language

This type of program was first developed by the American Government Defensive Department to create a common administrative language for internal and external use. The prominent language is COBOL (Common Business Oriented Language).

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