HP HP-21 - Appendix B: Improper Operations

Appendix B
Improper Operations
If you attempt a calculation containing an improper operation
—say, division by zero—the display will show .
To clear, press [C%4.
The following are improper operations:
where x = 0
where y < 0
where x < 0
where x = 0
where x < 0
where x < 0
where [x|is > 1
where [x|is > 1
where x = 0
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