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String Oriented Symbolic Language - Programming Languages - Lecture Slides, Slides of Programming Languages

Mody University of Science and TechnologyProgramming Languages

String Oriented Symbolic Language, Invention in SNOBOL, Application of SNOBOL, Simple Data Types, Simple Operators, Parentheses, Variables, Snobol Statement Structure are key points of this lecture. Programming languages is basic subject of computer science. Its not about any specific language but almost cover all of them.

Typology: Slides

2011/2012

Uploaded on 11/10/2012

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SNOBOL
•StriNg Oriented SymBOlic Language
•Special purpose language for string
manipulation and handling
•Invented in 1962 at the Bell Labs
•Farber, Griswold, and Polensky
•It was created out of the frustrations of
working with the languages of the that time
because they required the developers to
write large programs to do a single
operation
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Download String Oriented Symbolic Language - Programming Languages - Lecture Slides and more Slides Programming Languages in PDF only on Docsity!

SNOBOL

• StriNg Oriented SymBOlic Language

• Special purpose language for string

manipulation and handling

• Invented in 1962 at the Bell Labs

• Farber, Griswold, and Polensky

• It was created out of the frustrations of

working with the languages of the that time

because they required the developers to

write large programs to do a single

operation

Application

  • It was used to do most of the work in designing

new software and interpreting different language grammars

  • Toward the end of the eighties, newer

languages were created which could also be used for string manipulation

  • They include the PERL and AWK languages.

Unlike SNOBOL, Perl and Awk use regular expressions to perform the string operations

  • Today, roughly forty years after its release, the

language is rarely used!

Simple Operators

• Unary vs. Binary

 more on it later

• Assignment Operator

• Arithmetic Operators

• Parentheses

Variables

  • The name of a variable must begin with an upper or lower case letter
  • The language is ‘case insensitive’
  • If it is more than one character long, the remaining characters may be any combination of letters, numbers, or the characters ‘.’ (period) and ‘_’ (underscore)
  • The name may not be longer than the maximum length of a line (120 characters)

Snobol Statement Structure

Label Statement body :GOTOField

  • Label
    • Must begin in the first character position of a statement
    • Must start with a letter or a number

Snobol Statement Structure

  • The GOTO Field

 :(label)  :S(label)  :F(label)  :S(label1) F(label2)

Assignment Statement

variable = value

v = 5

w.1 = v

w = 14 + 3 * -

Spaces around arithmetic operators are necessary

No Spaces; Unary operator!

Strings

v = ‘Dog’

v = “Cat’s”

NULL =