The following PROC statement receives both positional and keyword parameters:

PROC 2 NAME ADDRESS STATE(NY) ZIP() PRINT

The number 2 indicates that the invoker must pass positional parameters for the first two variables, NAME and ADDRESS. Invokers can also pass keyword parameters with values for the variables STATE (the default value is NY) and ZIP (which has no default). In addition, invokers can pass the keyword parameter PRINT without a value, to specify a print option.