Specifications

Chapter 5. Data Types

5.5.4 Common Variables

A common variable should be declared in a main object beforehand. To share the common

variable by files other than the main object, you need to declare it with the

COMMON statement

in each file where the common variable should be available.

File 1

File 2

DECLARE SUB printaa(x) COMMON a%

COMMON a% SUB printaa(x)

a%=2 print a%+x

printaa(5) SUB

To use a% as a common variable in Files 1 and 2, define the variable with the COMMON state-

ment in each file.

If a common variable declared with the

COMMON statement is used within the SUB or FUNC-

TION

function in a file where the variable is defined, then the common variable will have the

same value.

(Example)

COMMON aa%

FUNCTION addaa(x)

addaa=aa%+x

END FUNCTION

SUB printaa(x)

print aa%+x

END SUB

aa%=2

print addaa(2)

printaa(2)

In the above example, variables aa% used in "addaa" and "printaa" will be treated as same

one.