H.5 Using Modules for Further Code Segmentation

Let's say we have an include file containing dozens of routines all having to do with tax calculations. We might make a tax module filled with these common tax routines to make development and maintenance easier.

module taxes routine calculate_tax with amount, rate, returning tax_due tax_due = amount * rate end routine end module

Code uses this module by including it into the main source code using the %include directive. Once included, data and routines within the module are referenced by preceding their names with the module name and a dot.

taxes.calculate_tax with amount cash, rate tax_rate, returning tax_due total_tax

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