Data Definition Language (DDL) Reference Manual

Named Constants

Data Definition Language (DDL) Reference Manual—529431-004

4-4

Product Version Constants

When specifying product version constants:

•

You can use a product version constant only in the VERSION clause of a TOKEN-

MAP statement, in the VALUE clause of a DEFINITION statement, or in the

VALUE clause of a CONSTANT statement.

When a VALUE clause in a DEFINITION or CONSTANT statement includes a

product version constant, the DDL compiler treats the product version constant

as a BINARY 16 integer type.

When a VERSION clause in a TOKEN-MAP statement includes a product

version number, the SPI product version compatibility mechanism uses the

product version number to identify the structure of a particular product version

of an extensible structured token.

•

When generating output from a product version constant for host-language source

code, the DDL compiler converts the product version string from the form ann to

the numeric representation of a product version number returned by the

TOSVERSION Guardian procedure.

You can compare product version numbers without decoding them.

To “decode” a product version number:

1. Obtain the letter of the product version by dividing the product version number by

256. The quotient is the ASCII decimal representation of the uppercase letter. Any

remainder is ignored.

2. Obtain the number of the product version by multiplying the quotient from Step 1

by 256 and subtracting the answer from the product version number.

For example, for product version number 17162:

1. 17162 divided by 256 = 67.04

2. 67 is the ASCII decimal representation for the letter C

3. 67 multiplied by 256 = 17152, and 17162 - 17152 = 10

4. C10 is the product version