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× C Standard Library


The C <math.h> nextafter() function is used to return the next representable value after x in the direction of y. The nexttoward() function is similar to this function, except it takes a long double as second argument.

Syntax

double nextafter  (double x, double y);
float nextafterf (float x, float y);
long double nextafterl (long double x, long double y);                     

Parameters

x Specify the base value.
y Specify the value toward which the return value is approximated.

Return Value

Returns the next representable value after x in the direction of y.

Example:

The below example shows the usage of nextafter() function.

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

int main (){

  printf("nextafter(0.0, 1.0): %e\n", nextafter(0.0, 1.0));
  printf("nextafter(0.0, -1.0): %e\n", nextafter(0.0, -1.0));
  return 0;
}

The output of the above code will be:

nextafter(0.0, 1.0): 4.940656e-324
nextafter(0.0, -1.0): -4.940656e-324

❮ C <math.h> Library