All local variables named on the subroutine statement must be defined in that subroutine. Real or integer variables passed to the subroutine must be defined as such in the routine. For example:

Single data variables (columns in the C array or user-defined data variables with one cell only) are passed to a subroutine by naming the variable on a data statement as shown here:

Fields of data variables are passed as integers with the definition:

Any multicodes present in this field are ignored. If you have a multicoded field and you want to be able to access the codes in each multicode, you must treat the field as a series of single data variables and pass each one separately, using a data statement, rather than passing the field as a whole. When variables are passed with call they are written in exactly the same way as you would write them anywhere else in your edit. For example:

passes the address of the data variable c15, and the integer values of the variables gallons and cost and the field c(20,28).

Here is a chart summarizing how to define variables for subroutines:

Notice that in the main definitions the size of the variable is defined, whereas in the subroutine definition no size is required since all values are passed as integer values or, in the case of a single data variable, as an address.