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How did you know the value of PI would return 10 bytes? I thought floating point numbers in BBC BASIC was 32bit/4bytes (using V5)?
Native floating-point numbers in BBC BASIC are never 4 bytes (not even in the original 6502 version); you must be thinking about a different dialect of BASIC. In BBC BASIC they are either 5, 8 or 10 bytes. In this case I was using v6.00a, so variant numeric variables are 10 bytes (unless I state otherwise, you should assume that I am using the latest version).
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How can I see the binary representation of PI to understand how floating point numbers look in binary?
It's documented in the BB4W help manual, under 'Format of Data in Memory... Variable storage in memory', or you can read it online here.
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