Rational Developer for System z
COBOL for Windows, Version 7.5, Programming Guide


Improving performance and productivity

Tuning your program
Using an optimal programming style
Using structured programming
Factoring expressions
Using symbolic constants
Grouping constant computations
Grouping duplicate computations
Choosing efficient data types
Choosing efficient computational data items
Using consistent data types
Making arithmetic expressions efficient
Making exponentiations efficient
Handling tables efficiently
Optimization of table references
Optimization of constant and variable items
Optimization of duplicate items
Optimization of variable-length items
Comparison of direct and relative indexing
Optimizing your code
Optimization
Contained program procedure integration
Choosing compiler features to enhance performance
Performance-related compiler options
Evaluating performance
Simplifying coding
Eliminating repetitive coding
Example: using the COPY statement
Manipulating dates and times
Getting feedback from date and time callable services
Handling conditions from date and time callable services
Example: manipulating dates
Example: formatting dates for output
Feedback token
Picture character terms and strings
Example: date-and-time picture strings
Century window
Example: querying and changing the century window

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