在C/C++中，nextafter()和nexttoward()的翻译如下：

这里我们将看到 C 或 C++ 中的 nextafter() 和 nextforward() 函数的效果。这些函数存在于 math.h 或 cmath 库中。

如果函数类似于 nextafter(a, b) 和 nextforward(a, b)。这些函数用于在 b 方向上查找 a 之后的下一个可表示值。 nextforward() 有更精确的第二个参数 b。

示例

#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));
}

输出

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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