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| frexp |
| Portability: | ISO/ANSI C conforming, UNIX compatible |
| SYNOPSIS | |
| DESCRIPTION | |
| RETURN VALUE | |
| USAGE NOTES | |
| RELATED FUNCTIONS | |
| SEE ALSO |
| SYNOPSIS |
#include <math.h> double frexp(double y, int *j);
| DESCRIPTION |
frexp
separates a floating-point argument
y
into
a fraction and an integer exponent of 2.
| RETURN VALUE |
frexp
returns a real number that is equal to or greater than .5 and less than 1.0.
The exponent of 2 is stored in the location addressed by
j
.
| USAGE NOTES |
frexp
is useful in situations that require repeated multiplication by 2. If the
next multiplication causes an overflow or underflow, you can use
frexp
to separate the mantissa from the exponent. This gives you complete
control over the exponent and mantissa so you can operate on them separately
without any loss of precision.
| RELATED FUNCTIONS |
| SEE ALSO |
|
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