HP 15C User Manual download pdf (Page 105)

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Section 9: Subroutines 105

Further Information

The Subroutine Return

The pending return condition means that the n instruction occurring

subsequent to a G instruction causes a return to the line following the

G rather than a return to line 000. This is what makes a subroutine

useful and reuseable in different parts of a program: it will always return

execution to where it branched from, even as that point changes. The only

difference between using a G branch and a t branch is the transfer

of execution after a n.

Nested Subroutines

If you attempt to call a subroutine that is nested more than seven levels

deep, the calculator will halt and display Error 5 when it encounters the

G instruction at the eighth level.

Note that there is no limitation (other than memory size) on the number of

nonnested subroutines or sets of nested subroutines that you may use.

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HP 15C User Manual Page 105

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