Preface to the Second Edition... xi A Note About Source Entry... xi

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Transcription:

Contents Preface to the Second Edition... xi A Note About Source Entry... xi Chapter 1: Pre Free-Format RPG IV... 1 RPG IV... 1 Extended Factor 2... 2 Built-in Functions... 2 Subprocedures... 3 Other Changes... 3 Some Baggage That Came Along... 4 The Future... 4 Chapter 2: The Case for Free-Format RPG... 7 Easier to Read and Maintain... 7 Good Field Naming... 8 Indenting... 10 Use of Comments... 10 No Goto Operations... 11 Conclusions... 11 A Modern Programming Style... 12 Free-Format RPG IV and C... 12 Free-Format RPG IV and Java... 13 Conclusions... 14 Being Current... 14 The Programmer s Perspective... 14 Management s Perspective... 15 Conclusions... 15 Check It Out... 15 Chapter 3: Free-Format H, F, D, and P Specifications... 17 The H (Control) Specification... 17 The F (File) Specifications... 18

vi Free-Format RPG IV The D (Definition) Specifications... 20 The P (Procedure) Specification... 24 Conclusions... 25 Chapter 4: Introducing Free-Format RPG IV... 27 Coding Free-Format Calculations... 28 Naming Variables... 29 Programming Style... 30 A Note About Case... 30 Free-Format Operation Codes... 31 Evaluate... 34 If... 35 Controlled Looping... 37 Mathematics... 38 Character Strings... 38 Programming Style Issues... 39 Mixing Formats... 39 Keyed Access... 42 Named Indicators... 43 Naming File Indicators... 43 Summing Up... 44 Chapter 5: Input/Output Using Free Format... 47 Database Input... 47 %Eof... 48 %Found... 49 %Error... 50 %Equal... 51 Data Area Input... 52 Database Output... 52 Write... 52 Update... 53 Delete... 53

Contents vii Except... 53 Workstation I/O... 54 Write/Read... 54 Write... 55 Read... 55 ICF I/O... 55 Dsply... 55 Printer Output... 57 Overflow Indicator... 57 Write... 57 Except... 57 Chapter 6: Program Flow Using Free Format... 59 The If Group... 59 If... 59 Else... 62 Elseif... 62 Endif... 62 The Do Operations... 63 Do While... 63 Do Until... 64 Dow and Dou Differences... 64 For... 65 Loop Interrupt... 66 Leave... 66 Iter... 67 The Select Group... 68 Select... 68 Operations Absent in Free Format... 69 Chapter 7: Embedded SQL Operations Using Free Format... 71 Database and Embedded SQL... 71

viii Free-Format RPG IV Fixed-Format Method... 71 Free-Format Method... 73 Chapter 8: Data-Manipulation Operations Using Free Format... 75 Assignment Statements... 75 Eval Operation: Numeric... 76 Eval Operation: Character... 77 Evaluate Right (EvalR) Operation... 78 Eval Operation: IS,OC... 78 Evaluate vs. Move... 79 Built-in Functions... 79 Converting Decimal to Character... 80 Converting Character to Packed Decimal... 81 Substringing... 82 Replace... 83 Scan and Replace... 84 Concatenation and Trim... 85 Converting Character to Integer... 86 Extracting Size, Length, and Decimal Positions... 87 Number of Elements... 88 Looking for Something?... 89 String Translation... 90 Combining Built-in Functions... 91 Date and Time Operations... 92 Converting Numbers to Date and Time... 92 Converting Date and Time to Character or Decimal... 93 Date and Time Arithmetic... 94 Chapter 9: Math Operations in Free Format... 97 Expressions in Assignment Statements and Elsewhere... 97 Four-Function Math... 98 Short-Form Math... 98 Exponentiation... 100

Contents ix Precedence... 101 Mathematical Expressions Elsewhere... 102 Eval Differences in Fixed and Free Format... 102 Naming Variables... 103 Semicolon... 104 Free-Format Math in RPG IV... 104 Numeric Data Types... 105 Changing Data Type... 105 Chapter 10: Call and Return in Free Format... 107 Call Prototyped (CallP) Operation... 107 Dynamic Call... 108 Bound Call... 109 Parameter-Passing Options... 110 Value... 110 Const... 111 Options(*NoPass)... 111 Options(*Omit)... 111 Options(*Varsize)... 111 Options(*String)... 112 Options(*RightAdj)... 112 Options(*Trim)... 112 The Return Operation... 114 Subprocedures... 114 Accessing APIs... 115 API Examples... 116 Chapter 11: Solutions for Problem Situations... 119 Solution for the Fixed-Format MoveA Operation... 119 History... 119 The Free-Format Solution... 120 The %Subarr Built-in Function... 122 Solution for the Fixed-Format Move Operation... 123

x Free-Format RPG IV Breaking It Down... 123 When Both Fields Are Character... 123 Data Type Differences... 125 Solution for the Fixed-Format MoveL Operation... 125 Breaking It Down... 125 When Both Fields Are Character... 125 Solution for the Case Operation... 126 Solution for the Do Operation... 128 The Do Syntax... 128 The Free-Format Solution... 128 Error-Handling Techniques... 129 The Monitor Solution... 130 ILE Exception Handler... 131 Chapter 12: Sample Programs... 133 An Investment and Loan Utility Program... 133 A Customer Inquiry Program... 138 A Customer Data Entry Program... 140 A Sales Report Program... 145 Appendix A: Free-Format Operations... 151 Expression Operators... 151 Operation Extenders... 153 Free-Format Operations... 153 Appendix B: Example Screens, DDS, and Programs... 185 Investment and Loan Utility Program... 185 Customer Inquiry Program... 189 Customer Data Entry Program... 192 Sales Report Program... 199 Appendix C: Free-Format Alternatives for Fixed-Format Operations... 207 Index... 213

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