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C/C++ 中的 nextafter() 和 nexttoward()

2023-06-20 09:47:02 428

在这里我们将看到C或C++中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的方向上找到a之后的下一个可表示值。的nextforward()具有更精确的第二参数b。

示例

#include 
#include 
main () {
   //nextafter函数()
   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));
   //使用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));
}

输出结果

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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C/C++ 中的 nextafter() 和 nexttoward()

示例

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