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ITSE1402 Programming

COBOL & CICS CODEUNIT 1 Stephen S. Linkin

Houston Community College System

8/28/2007Copywrite ©Houston Community College System 2007

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GraphicsCourtesy of IBM. And Course Technologies (Shelly and Cashman)

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CHAPTER 1 INTRODUCTION

Advantages of COBOL Disadvantages of COBOL

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INFORMATION PROCESSING

Stream input/output vs. record input/output Blocking Records

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STEPS IN THE PROGRAMMING PROCESS Step 1 - Understand the problem Step 2 - Design the program Step 3 - Code the program Step 4 - Test the program Step 5 - Document the program

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SEQUENCE

STRUCTURED PROGRAMMING

Top-down design/top-down programming Divisions of a COBOL program

◦ IDENTIFICATION DIVISION◦ ENVIRONMENT DIVISION◦ DATA DIVISION◦ PROCEDURE DIVISION

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SELECTCASE

ITERATION

ITERATION

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COBOL RESERVED WORDS

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COBOL CODING FORMAT

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CHAPTER 2 INTRODUCTION

A case study

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PREPARING PROGRAM LOGIC

Hierarchy charts Pseudocode Flowcharts

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IDENTIFICATION DIVISION

PROGRAM-ID AUTHOR,

INSTALLATION, DATE-WRITTEN, and DATE-COMPILED

Comment box Format notation

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ENVIRONMENT DIVISION

SELECT statements

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DATA DIVISION

FILE SECTION FD level indicator

◦ Level numbers Picture clauses WORKING-STORAGE

SECTION SWITCHES ACCUMULATORS Work area fields

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PROCEDURE DIVISION

MAIN-PROGRAM Initialization Process-file Process-record Heading routine Wrap-up

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CHAPTER 3 INTRODUCTION

Designing the Inventory Vendor Report◦ Inventory Vendor Report◦ Hierarchy chart◦ Program flowchart◦ Inventory File record layout◦ Inventory Vendor Report program

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ENVIRONMENT DIVISION

CONFIGURATION SECTION SPECIAL NAMES INPUT-OUTPUT SECTION

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DATA DIVISION

Data categories◦ Alphabetic (Text)◦ Alphanumeric (Mixed)◦ Numeric◦ Alphanumeric Edited◦ Numeric Edited

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EDIT PATTERNS

Floating dollar signs Plus sign Minus sign Credit symbol and debit symbol Blank, zero, and slash BLANK WHEN ZERO clause JUSTIFIED RIGHT clause Scaling — P symbol

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DATANAME QUALIFICATION

COBOL Field names must be unique Qualified Names (Implied Duplication)

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End of Presentation