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        <h2>Function hexdig_value</h2>
        <p><span>Return the decimal value of a hex character</span></p>


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        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
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        <pre class="source-code cpp">
            signed char
hexdig_value(char ch) noexcept;
        </pre>
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        <h3>Description</h3>
        <p><span>This function returns the decimal</span> <span>value of a hexadecimal character,</span>
<span>or -1 if the argument is not a</span>
<span>valid hexadecimal digit.</span></p>

<h3>BNF</h3>
<code>
HEXDIG      = DIGIT
            / "A" / "B" / "C" / "D" / "E" / "F"
            / "a" / "b" / "c" / "d" / "e" / "f"
</code>

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