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     The frexp function breaks down the floating-point value <x> into a
     mantissa <m> and an exponent <n>. The absolute value of <m> is
     greater than or equal to 0.5 and less than 1.0, and <x> is equal
     to <m>*(2 to the power of <n>).
 
     The integer exponent <n> is stored at the location pointed to by
     <expptr>.
 
     The frexpl function uses the 80-bit long double form of arguments
     and return values. In all other respects, it is identical to
     frexp.
 
     Return Value
 
     These functions return the mantissa. If <x> is 0, the function
     returns 0 for both the mantissa and exponent. There is no error
     return.
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