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CRTL, pow, Return Values
 *Conan The Librarian 

    x                  The result of the first argument raised to the
                       power of the second.
    1.0                The base is 0 and the exponent is 0.
    HUGE_VAL           The result overflowed; errno is set to ERANGE.
    HUGE_VAL           The base is 0 and the exponent is negative;
                       errno is set to ERANGE or EDOM.
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