negative.php

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<?php

namespace Complex;

if (!function_exists(__NAMESPACE__ . '\\negative')) {
    function negative($complex): Complex
    {
        $complex = Complex::validateComplexArgument($complex);

        return new Complex(
            -1 * $complex->getReal(),
            -1 * $complex->getImaginary(),
            $complex->getSuffix()
        );
    }
}