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× C Standard Library


The C <math.h> rint() function returns an integral value by rounding up the specified number, using the rounding direction specified by fegetround.

This function may raise FE_INEXACT exceptions, if the returned value differs from x. The nearbyint() function is similar to this function, except it do not raise FE_INEXACT exceptions.

Syntax

double rint  (double x);
float rintf (float x);
long double rintl (long double x);                       

Parameters

x Specify a value to round.

Return Value

Returns an integral value by rounding up the x, using the rounding direction specified by fegetround.

Example:

In the below example, rint() function is used to round the given number.

#include <stdio.h>
#include <fenv.h>
#include <math.h>

void Rounding_Direction_Message(void) {
  printf("Rounding using ");
  switch(fegetround()) {
    case FE_DOWNWARD: 
      printf("downward"); break;
    case FE_TONEAREST:   
      printf("to-nearest"); break;
    case FE_TOWARDZERO:   
      printf("toward-zero"); break;
    case FE_UPWARD:  
      printf("upward"); break;
    default:
      printf("unknown");
  }
  printf(" method:\n");
}

int main (){
  Rounding_Direction_Message();

  printf("rint(10.2): %.1f\n", rint(10.2));
  printf("rint(10.8): %.1f\n", rint(10.8));
  printf("rint(-5.2): %.1f\n", rint(-5.2));
  printf("rint(-5.8): %.1f\n", rint(-5.8));

  return 0;
}

The output of the above code will be:

Rounding using to-nearest method:
rint(10.2): 10
rint(10.8): 11
rint(-5.2): -5
rint(-5.8): -6

❮ C <math.h> Library