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     The ldexp function calculates and returns the value of
     <x>*2^<exp>.
 
     The ldexpl function uses the 80-bit long double form of arguments
     and return values. In all other respects, it is identical to
     ldexp.
 
     Return Value
 
     The return value is noted above. If an overflow results, the
     functions return ± HUGE_VAL (depending on the sign of <x>) and set
     errno to ERANGE.
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