SAS Certification Prep Guide, 4th Edition

Using Macro Parameters

You have seen the basic form for a macro definition. Your macros often contain macro variables. To make your macros more dynamic, you could use the %LET statement to update the values of the macro variables that are used within the macros. However, parameter lists in your macro definitions enable you to update the macro variables within your macro programs more conveniently. A parameter list is an optional part of the %MACRO statement that names one or more macro variables whose values you specify when you call the macro.

Example

Suppose the compiled macro Printdsn contains references to the macro variables dsn (which records a data set name) and vars (which records a list of data set variables), as follows:

%macro printdsn; ...