DUP, AVR SwiftX

Something as simple as DUP bit me. I've always assumed that DUP checks the stack and would error if the stack was empty, not so.

Don't have the exact number but....

When DUP is run on an empty stack I get the number 658, I believe, in return. Not 2 numbers, ie the original and a copy but just the one 658. No indication that that the stack was empty.

Late one night I actually provided 2 errors in a word that countered each other. The 1st was the use of DUP with an empty stack and the 2nd placed a number on the stack that made up for the empty DUP stack.

How or where does one look or find which words perform a test on the stack??

Gene SIlvernail

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Received on Thu Apr 11 2002 - 17:06:06 PDT