The hex number exists only on the right hand side of line 1; the value stored in $num is 0...0100000000, popularly known as 256.

If f2 doesn't do any calculations with the argument, only print it out, you might be able to pass in the number as a hex string:

f2( sprintf "0x%0x", $num );

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--
TTTATCGGTCGTTATATAGATGTTTGCA

In reply to Re: passing hex argument as string by TomDLux
in thread passing hex argument as string by Anonymous Monk

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