nextafter Function

Determines the next value after x in the direction of y that can be represented by the type of the function.

Include

<math.h>

Prototype

double nextafter(double x, double y);

Arguments

x

the original value

y

the target value

Return Value

Determines the next value after x in the direction of y that can be represented by the type of the function. The value of y is returned if x equals y.

Remarks

A range error might occur if the magnitude of x is the largest finite value representable in the type and the result is infinite or not representable in the type.

Example

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

int main(void)
{
  double x,y,z;

  x = 150.0;
  y = 300.0;
  z = nextafter(x, y);
  printf("The next representable value after %f in the direction of %f is %.10f\n", x, y, z);

  x = 150.0;
  y = -300.0;
  z = nextafter(x, y);
  printf("The next representable value after %f in the direction of %f is %.10f\n", x, y, z);

}

Example Output

The next representable value after 150.00000 in the direction of 300.00000 is 150.0000152588
The next representable value after 150.00000 in the direction of -300.00000 is 149.9999847412