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FORM num width precision
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outputs a word containing a printable representation of "num",
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possibly preceded by spaces (and therefore not a number for
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purposes of performing arithmetic operations), with at least
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"width" characters, including exactly "precision" digits after
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the decimal point. (If "precision" is 0 then there will be no
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decimal point in the output.)
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As a debugging feature, (FORM num -1 format) will print the
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floating point "num" according to the C printf "format", to allow
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op form :num -1 "|%08X %08X|
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to allow finding out the exact result of floating point operations.
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The precise format needed may be machine-dependent.