Rational Developer for System z
Enterprise COBOL for z/OS, Version 4.1, Programming Guide


Choosing efficient data types

Choosing the appropriate data type and PICTURE clause can produce more efficient code, as can avoiding USAGE DISPLAY and USAGE NATIONAL data items in areas that are heavily used for computations.

Consistent data types can reduce the need for conversions during operations on data items. You can also improve program performance by carefully determining when to use fixed-point and floating-point data types.

related concepts  
Formats for numeric data


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