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Break a floating-point number into a normalized fraction and an integral power of 2
#include <math.h>
double frexp( double value,
int* exp );
float frexpf( float value,
int* exp );
- value
- The value you want to break into a normalized fraction.
- exp
- A pointer to a location where the function can store the integral
power of 2.
libm
Use the -l m option to
qcc
to link against this library.
These functions break a floating-point number into a
normalized fraction and an integral power of 2.
It stores the integral power of 2 in the int pointed to by
exp.
x, such that x is a double with magnitude in the interval
[0.5, 1] or 0, and value equals x
times 2 raised to the power exp. If value
is 0, then both parts of the result are 0.
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main( void )
{
int expon;
double value;
value = frexp( 4.25, &expon );
printf( "%f %d\n", value, expon );
value = frexp( -4.25, &expon );
printf( "%f %d\n", value, expon );
return EXIT_SUCCESS;
}
produces the output:
0.531250 3
-0.531250 3
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
ldexp(),
modf()
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