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COBOL

COBOL. William, Andrew, Stephanio, Michael. Introduction. COmmon Business Oriented Language Created in 1959 It is an imperative language It was created to be used in business and administrative systems for companies and governments. Historical Context.

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COBOL

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  1. COBOL William, Andrew, Stephanio, Michael

  2. Introduction • COmmon Business Oriented Language • Created in 1959 • It is an imperative language • It was created to be used in business and administrative systems for companies and governments

  3. Historical Context • The creators of the COBOL programming language, a committee of researchers from various universities and private industry leaders, drew upon languages such as FLOW-MATIC (B-0) and IBM's COMTRAN. • FLOW-MATIC was the first English-like processing language and became public in 1958

  4. Problem Domain • The language continued to evolve well after its creation in 1959. • In 1968, the American National Standards Institute created a standard from of COBOL, known as ANS COBOL • In 1985, ANSI published a second revised version of COBOL (first was in 1974), containing constructs such as END-IF and END-PERFORM

  5. COBOL Concepts • Data processing language • Readable code statements • functions written out, such as ADD • statements end with "." • Still evolving • implemented Object-Oriented design • Code split into Divisions • IDENTIFICATION DIVISION • ENVIRONMENT DIVISION • DATA DIVISION • PROCEDURE DIVISION

  6. Concepts (cont.) • IDENTIFICATION DIVISON • first division • 2 required entries: • division header • program-id (name of program) • ENVIRONMENT DIVISION • second division • 2 allowable sections: • CONFIGURATION SECTION • characteristics of computer system • INPUT-OUTPUT SECTION • files that will be used (patron file & output)

  7. Concepts (cont.) • DATA DIVISON • data processed program • 2 sections: • FILE SECTION • data items of input and output defined here • file descriptions for all files used • WORKING-STORAGE SECTION • field not present in input or output file • PROCEDURE DIVISION • actions program will complete • has different paragraphs • work like methods in C++/Java • ex. PRINT-SALES-REPORT

  8. Comparison • Cobol has defined structure • Some languages like C++ and Java don't have the same structure so it is harder to read • Was designed for Business Oriented Applications • Doesn't focus on visual side of applications like newer languages; it focuses on processing information efficiently

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