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Expensive calculator…

Oracle has evolved over time to much more than just a plain relational database. One option is to use Oracle as an expensive calculator.
When researching or demoing Oracle, it’s quite convenient to do number calculations directly on sqlplus prompt, especially if dealing with internals where lots of stuff is about addresses and offsets shown in hex.
Here’s the script what I use for such purposes:
It usually saves me couple of seconds every calculation as I don’t have to reopen the calc.