In C/C++, nextafter() and nexttoward() are translated as follows:

Here we will see the effect of nextafter() and nextforward() functions in C or C. These functions exist in the math.h or cmath libraries.

If the function is similar to nextafter(a, b) and nextforward(a, b). These functions find the next representable value after a in the b direction. nextforward() has a more precise second parameter b.

Example

#include <stdio.h>
#include <math.h>
main () {
   //The nextafter function()
   printf ("Smallest representable number after 0 towards 1 : %e\n", nextafter(0.0, 1.0));
   printf ("Largest representable number before -1 towards 0 :%e\n", nextafter(0.0, -1.0));
   printf ("Largest +ve representable number after 0.8 : %e\n", nextafter(0.8, 0.0));
   // using nexttoward
   printf("\n");
   printf ("Smallest representable number after 0 towards 1 : %e\n", nexttoward(0.0, 1.0));
   printf ("Largest representable number before -1 towards 0 : %e\n", nexttoward(0.0, -1.0));
   printf ("Largest +ve representable number after 0.8 : %e\n", nexttoward(0.8, 0.0));
}

Output

Smallest representable number after 0 towards 1 : 4.940656e-324
Largest representable number before -1 towards 0 :-4.940656e-324
Largest +ve representable number after 0.8 : 8.000000e-001
Smallest representable number after 0 towards 1 : 4.940656e-324
Largest representable number before -1 towards 0 : -4.940656e-324
Largest +ve representable number after 0.8 : 8.000000e-001

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