frexp(3) CLIX frexp(3)
NAME
frexp, ldexp, modf - Manipulates parts of floating-point numbers
LIBRARY
Standard C Library (libc.a)
SYNOPSIS
double frexp(
double value ,
int *eptr );
double ldexp(
double value ,
int exp );
double modf(
double value ,
double *iptr );
PARAMETERS
value Specifies a double integer.
eptr Points to an exponent (see below).
exp Specifies the exponent of an integer (see below).
iptr Points to the integral part of value.
DESCRIPTION
Every nonzero number can be written uniquely as x * 2 n, where the
``mantissa'' (fraction) x is in the range 0.5 < x < 1.0, and the
``exponent'' n is an integer. The frexp() function returns the mantissa
of a double value, and stores the exponent indirectly in the location
pointed to by eptr. If value is 0, both results returned by frexp() are
0.
The ldexp() function returns the quantity value * 2 exp .
The modf() function returns the signed fractional part of value and stores
the integral part indirectly in the location pointed to by iptr.
RETURN VALUES
If the ldexp() function causes overflow, +HUGE (defined in <math.h>) is
returned (according to the sign of value) and errno is set.
2/94 - Intergraph Corporation 1
frexp(3) CLIX frexp(3)
If ldexp() causes underflow, 0 is returned and errno is set.
ERRORS
The following errors can occur:
[ERANGE] The ldexp() function causes an overflow or underflow.
2 Intergraph Corporation - 2/94