-- Perl 5.8.7 documentation --
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.

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