nearbyint Function

Returns the double precision floating-point argument rounded to an integer value but returned in the argument's type.

Include

<math.h>

Prototype

double nearbyint(double x);

Argument

x
the value to round

Return Value

Returns the value of x rounded to an integer value using the current rounding direction and without generating an exception. The rounded integer is returned as a floating-point value.

Example

See the notes at the beginning of this chapter or section for information on using printf() or scanf() (and other functions reading and writing the stdin or stdout streams) in the example code.

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

int main(void)
{
  double x, y;

  x = 10.103;
  y = nearbyint(x);
  printf("The nearest integer value to %f is %f\n", x, y);

  x = 10.51;
  y = nearbyint(x);
  printf("The nearest integer value to %f is %f\n", x, y);
}

Example Output

The nearest integer value to 10.103000 is 10.000000
The nearest integer value to 10.510000 is 11.000000