Round to the nearest integral value
#include <math.h> double rint ( double x ); float rintf ( float x ); long double rintl( long double x );
The rint(), rintf(), and rintl() 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 |
#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); }
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |