Parameters, Cont’d

Example: SHIFT Subroutine:

$SHIFT:

$ P1 = P2

$ P2 = P3

.

.

.

$ P7 = P8

$ P8 :=

$ RETURN

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Here’s an example SHIFT subroutine.

It SHIFTs the values of the parameters by one position, discarding the first and blanking out the last.

The next slide shows how to implement this.