Murach's Mainframe COBOL

Chapter 22 How to become an effective maintenance programmer
Statements and features you should be aware of 654
Perform Thru and Go To statements 654
Go To Depending statements 656
Section names in the Procedure Division 658
Qualification and the Move, Add, and Subtract Corresponding statements 660
Declarative sections 662
The basic skills for maintaining programs 664
A structured procedure for maintaining a program 664
What to change and where to change it 666
How to document the changes in the source code 668
Perspective 670
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Murach's Mainframe COBOL

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