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sqrt

Perl 5 version 8.9 documentation
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sqrt

Perl functions A-Z | Perl functions by category | The 'perlfunc' manpage
  • sqrt EXPR

  • sqrt

    Return the square root of EXPR. If EXPR is omitted, returns square root of $_ . Only works on non-negative operands, unless you've loaded the standard Math::Complex module.

    1.     use Math::Complex;
    2.     print sqrt(-2);    # prints 1.4142135623731i