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`ldexp', `ldexpf'--load exponent

     #include <math.h>
     double ldexp(double VAL, int EXP);
     float ldexpf(float VAL, int EXP);
`ldexp' calculates the value VAL times 2 to the power EXP.  `ldexpf' is
identical, save that it takes and returns `float' rather than `double'
`ldexp' returns the calculated value.
   Underflow and overflow both set `errno' to `ERANGE'.  On underflow,
`ldexp' and `ldexpf' return 0.0.  On overflow, `ldexp' returns plus or
minus `HUGE_VAL'.
`ldexp' is ANSI, `ldexpf' is an extension.