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Load the exponent of a radix-independent floating point number
#include <math.h>
double scalbn ( double x,
int n );
float scalbnf ( float x,
int n );
- x
- The floating point number that you want to multiply by the exponent.
- n
- The exponent to apply to the radix of the machine's floating-point
arithmetic.
libm
Use the -l m option to
qcc
to link against this library.
The scalbn() and scalbnf() functions
compute x × rn,
where r is the radix of the machine's floating
point arithmetic.
x × rn
|
If an error occurs, these functions return 0, but this is also a valid
mathematical result.
If you want to check for errors, set
errno
to 0, call the function, and then check errno again.
These functions don't change errno if no errors occurred. |
#include <stdio.h>
#include <errno.h>
#include <inttypes.h>
#include <math.h>
#include <fpstatus.h>
int main(int argc, char** argv)
{
double a, b, c, d;
a = 10;
b = 2;
c = scalbn(a, b);
d = sqrt(c/a);
printf("Radix of machines fp arithmetic is %f \n", d);
printf("So %f = %f * (%f ^ %f) \n", c, a, d, b);
return(0);
}
produces the output:
Radix of machines fp arithmetic is 2.000000
So 40.000000 = 10.000000 * (2.000000 ^ 2.000000)
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
scalb()
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