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CRTL, ldexp, Return Values
 *Conan The Librarian 

    x(2n)              The first argument multiplied by 2 raised to

                       the power of the second argument.
    0                  Underflow occurred; errno is set to ERANGE.
    HUGE_VAL           Overflow occurred; errno is set to ERANGE.
    NaN                x is NaN; errno is set to EDOM.
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