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Round to the nearest integral value
#include <math.h>
double rint ( double x );
float rintf ( float x );
- x
- The number that you want to round.
libm
Use the -l m option to
qcc
to link against this library.
The rint() and rintf() functions
return the integral value
nearest x in the direction of the current
rounding mode.
If the current rounding mode rounds toward negative infinity,
then rint() is identical to
floor().
If the current
rounding mode rounds toward positive infinity, then rint()
is identical to
ceil().
An integer (represented as a double precision number) nearest x
in the direction of the current rounding mode (IEEE754).
If x is: |
rint() returns: |
±Infinity |
x |
NAN |
NAN |
|
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;
a = 0.7 ;
b = rint(a);
printf("Round Native mode %f -> %f \n", a, b);
return(0);
}
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
ceil(),
floor()
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