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7.1.1.2 Types of Functions
There are three types of functions:
Alphanumeric functions are of the class and category alphanumeric. The value returned has an implicit usage of DISPLAY and is in standard data format characters. The number of character positions in the value returned is determined by the function definition.
Numeric functions are of the class and category numeric. The returned value is always considered to have an operational sign and is a numeric intermediate result. For more information, see the IBM COBOL Programming Guide for your platform.
Integer functions are of the class and category numeric. The returned value is always considered to have an operational sign and is an integer intermediate result. The number of digit positions in the value returned is determined by the function definition. For more information, see the IBM COBOL Programming Guide for your platform.

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