Here we will see the effect of nextafter() and nextforward() functions in C or C++. These functions are present in the math.h or cmath library.
if the functions are like nextafter(a, b) and nextforward(a, b). These functions are used to find the next representable value after a in the direction of b. The nextforward() has 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