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+.TH FREXP 3
+.CT 2 math data_man
+.SH NAME
+frexp, ldexp, modf \(mi split into mantissa and exponent
+.SH SYNOPSIS
+.B #include <math.h>
+.PP
+.nf
+.B double frexp(value, eptr)
+.B double value;
+.B int *eptr;
+.PP
+.B double ldexp(value, exp)
+.B double value;
+.PP
+.B double modf(value, iptr)
+.B double value, *iptr;
+.SH DESCRIPTION
+.I Frexp
+returns the mantissa of
+.I value
+and stores the exponent indirectly through
+.I eptr,
+so that
+.I value
+=
+.if t .IR frexp ( value )\(mu2\u\s-2 \(**eptr \s0\d.
+.if n .IR frexp ( value )*2** (*eptr).
+.PP
+.I Ldexp
+returns the quantity
+.if t .IR value \(mu2\u\s-2 exp \s0\d.
+.if n .IR value *2** exp.
+.PP
+.I Modf
+returns the positive fractional part of
+.I value
+and stores the integer part indirectly
+through
+.I iptr.
+.SH DIAGNOSTICS
+On underflow
+.I ldexp
+returns 0; on
+overflow it returns a properly signed largest value.
+In both cases it sets
+.I errno
+to
+.BR ERANGE .