This is expected. sprintf does an unbiased rounding, so .5 not always round up.
"C is doing the exact opposite"
Your Perl simply calls the underlying c sprintf. Instead of saying C is doing the opposite, you should just say "my c follows slightly different rule than the c used to compile my Perl."
In reply to Re: Rounding error?
by pg
in thread Rounding error?
by dracos
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