Re: Rounding to a Given Number of Significant Figures Rather Than Decimal Places

Have a look at Does Perl Have A round() function? in the Perl FAQ Number 4 perlfaq4

E.G. The POSIX module (part of the standard Perl distribution) implements ceil(), floor(), and a number of other mathematical and trigonometric functions.

    use POSIX;
    $ceil   = ceil(3.5);                        # 4
    $floor  = floor(3.5);                       # 3
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