Question

How to use nextafter() function to get the next representable float of from (x) in the direction of (y) in C

Answer 1

#include <stdio.h>     
#include <math.h> 
 
int main(int argc, char **argv)
{   
	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));
	printf ("nextafter(0.1, 0) = %e\n", nextafter(0.1, 0));
  
    return 0;
}
 
/*
run:
   
nextafter(0.0, 1.0) =  4.940656e-324
nextafter(0.0, -1.0) = -4.940656e-324
nextafter(0.1, 0) = 1.000000e-001

*/

 

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