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Copy the sign bit from one number to another
#include <math.h>
double copysign ( double x,
double y);
float copysignf ( float x,
float y );
- x
- The number to use the magnitude of.
- y
- The number to use the sign of.
libm
Use the -l m option to
qcc
to link against this library.
The copysign() and copysignf()
functions return the magnitude of x
and the sign bit of y.
If x is NAN,
the function produces NAN with the
sign of y.
The magnitude of x and the sign bit of y.
#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;
a = 27.0;
b = -5;
c = copysign(a, b);
printf("The magnitude of %f and sign of %f gives %f\n",
a, b, c);
return(0);
}
produces the output:
The magnitude of 27.000000 and sign of -5.000000 gives -27.000000
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
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