Introduction to COBOL. COBOL  COBOL is an acronym which stands for Common Business Oriented Language.  The name indicates the target area of COBOL applications.

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Presentation transcript:

Introduction to COBOL

COBOL  COBOL is an acronym which stands for Common Business Oriented Language.  The name indicates the target area of COBOL applications.  COBOL is used for developing business, typically file-oriented, applications.  It is not designed for writing systems programs. You would not develop an operating system or a compiler using COBOL.  COBOL is one of the oldest computer languages in use (it was developed around the end of the 1950s). As a result it has some idiosyncracies which programmers may find irritating.

The COBOL Metalanguage - Syntax Notation  Words in uppercase are reserved words.  Words in mixed case represent names which will be devised by the programmer.  When material is enclosed in braces { } a choice must be made from the options within the braces.  Material is enclosed in square brackets [ ] indicates that the material is an option which may be included or omitted as required.  The ellipsis symbol ‘...’ indicates that the preceding syntax element may be repeated at the programmer’s discretion.

ProgramProgram DivisionsSection(s)Paragraph(s)Sentence(s)Statement(s) Structure of COBOL programs.

The Four Divisions. DIVISIONS are used to identify the principal components of the program text. There are four DIVISIONS in all.  IDENTIFICATION DIVISION.  ENVIRONMENT DIVISION.  DATA DIVISION.  PROCEDURE DIVISION. Although some of the divisions may be omitted the sequence in which the DIVISIONS are specified is fixed and must follow the pattern shown above.

Functions of the four divisions.  The IDENTIFICATION DIVISION is used to supply information about the program to the programmer and to the compiler.  The ENVIRONMENT DIVISION describes to the compiler the environment in which the program will run.  As the name suggests, the DATA DIVISION is used to provide the descriptions of most of the data to be processed by the program.  The PROCEDURE DIVISION contains the description of the algorithm which will manipulate the data previously described. Like other languages COBOL provides a means for specifying sequence, selection and iteration constructs.

COBOL Program Text Structure Data Descriptions Algorithm Description IDENTIFICATION DIVISION. DATA DIVISION. PROCEDURE DIVISION. Program Details

IDENTIFICATION DIVISION.  The purpose of the IDENTIFICATION DIVISION is to provide information about the program to the programmer and to the compiler.  Most of the entries in the IDENTIFICATION DIVISION are directed at the programmer and are treated by the compiler as comments.  An exception to this is the PROGRAM-ID clause. Every COBOL program must have a PROGRAM-ID. It is used to enable the compiler to identify the program.  There are several other informational paragraphs in the IDENTIFICATION DIVISION but we will ignore them for the moment.

The IDENTIFICATION DIVISION Syntax.  The IDENTIFICATION DIVISION has the following structure IDENTIFICATION DIVISION. PROGRAM-ID. NameOfProgram. [AUTHOR. YourName.]  The keywords IDENTIFICATION DIVISION represent the division header and signal the commencement of the program text.  The paragraph name PROGRAM-ID is a keyword. It must be specified immediately after the division header.  The program name can be up to 30 characters long.

The IDENTIFICATION DIVISION Syntax.  The IDENTIFICATION DIVISION has the following structure IDENTIFICATION DIVISION. PROGRAM-ID. NameOfProgram. [AUTHOR. YourName.]  The keywords IDENTIFICATION DIVISION represent the division header and signal the commencement of the program text.  The paragraph name PROGRAM-ID is a keyword. It must be specified immediately after the division header.  The program name can be up to 30 characters long. $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. SequenceProgram. AUTHOR. Team Sarmag. $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. SequenceProgram. AUTHOR. Team Sarmag.

The DATA DIVISION.  The DATA DIVISION is used to describe most of the data that a program processes.  The DATA DIVISION is divided into two main sections; l FILE SECTION. l WORKING-STORAGE SECTION.  The FILE SECTION is used to describe most of the data that is sent to, or comes from, the computer’s peripherals.  The WORKING-STORAGE SECTION is used to describe the general variables used in the program.

 The DATA DIVISION has the following structure DATA DIVISION Syntax $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Sequence-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Sequence-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS.

The PROCEDURE DIVISION.  The PROCEDURE DIVISION is where all the data described in the DATA DIVISION is processed and produced. It is here that the programmer describes his algorithm.  The PROCEDURE DIVISION is hierarchical in structure and consists of Sections, Paragraphs, Sentences and Statements.  Only the Section is optional. There must be at least one paragraph, sentence and statement in the PROCEDURE DIVISION.  In the PROCEDURE DIVISION paragraph and section names are chosen by the programmer. The names used should reflect the processing being done in the paragraph or section.

Sections  A section is a block of code made up of one or more paragraphs.  A section begins with the section name and ends where the next section name is encountered or where the program text ends.  A section name consists of a name devised by the programmer or defined by the language followed by the word SECTION followed by a full stop. l SelectUlsterRecords SECTION. l FILE SECTION.

Paragraphs  Each section consists of one or more paragraphs.  A paragraph is a block of code made up of one or more sentences.  A paragraph begins with the paragraph name and ends with the next paragraph or section name or the end of the program text.  The paragraph name consists of a name devised by the programmer or defined by the language followed by a full stop. l PrintFinalTotals. l PROGRAM-ID.

Sentences and Statements.  A paragraph consists of one or more sentences.  A sentence consists of one or more statements and is terminated by a full stop. l MOVE.21 TO VatRate COMPUTE VatAmount = ProductCost * VatRate. l DISPLAY "Enter name " WITH NO ADVANCING ACCEPT StudentName DISPLAY "Name entered was " StudentName.  A statement consists of a COBOL verb and an operand or operands. l SUBTRACT Tax FROM GrossPay GIVING NetPay l READ StudentFile AT END SET EndOfFile TO TRUE END-READ

A Full COBOL program. $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. SequenceProgram. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. CalculateResult. ACCEPT Num1. ACCEPT Num2. MULTIPLY Num1 BY Num2 GIVING Result. DISPLAY "Result is = ", Result. STOP RUN. $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. SequenceProgram. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. CalculateResult. ACCEPT Num1. ACCEPT Num2. MULTIPLY Num1 BY Num2 GIVING Result. DISPLAY "Result is = ", Result. STOP RUN.

The minimum COBOL program. $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. SmallestProgram. PROCEDURE DIVISION. DisplayPrompt. DISPLAY "I did it". STOP RUN. $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. SmallestProgram. PROCEDURE DIVISION. DisplayPrompt. DISPLAY "I did it". STOP RUN.