您将如何解决C /C++中的以下问题？
- C /C++中最小的可表示正浮点数是多少？
- C /C++中最大的可表示负浮点数是多少？
- 给定正浮点数x，找到小于x的最大可表示浮点值？
nextafter(x，y)和nexttoward(x.y)
在C和C++中，nextafter(x，y)和nexttoward(x.y)都是math.h或cmath头文件中定义的相似函数。它们都在y方向上返回x之后的下一个可表示值。 nexttoward()具有更精确的第二个参数y。
以下程序演示了该概念：
// C program to demonstrate use of nextafter() and nexttoward()
#include <stdio.h>
#include <math.h>
int main ()
{
// using nextafter
printf ("Smallest positive floating point number:%e\n",
nextafter(0.0, 1.0));
printf ("Largest negative floating point number:%e\n",
nextafter(0.0, -1.0));
printf ("Largest positive floating point number smaller than 0.5:%e\n",
nextafter(0.5, 0.0));
// using nexttoward
printf ("Smallest positive floating point number:%e\n",
nexttoward(0.0, 1.0));
printf ("Largest negative floating point number:%e\n",
nexttoward(0.0, -1.0));
printf ("Largest positive floating point number smaller than 0.5:%e\n",
nexttoward(0.5, 0.0));
return (0);
}输出：
nextafter first value greater than zero:4.940656e-324 nextafter first value less than zero:-4.940656e-324 nexttoward first value greater than zero:4.940656e-324 nexttoward first valnextafter first value greater than zero:4.940656e-324 nextafter first value less than zero:-4.940656e-324 nexttoward first value greater than zero:4.940656e-324 nexttoward first value less than zero:-4.940656e-324 ue less than zero:-4.940656e-324
相关用法
注：本文由纯净天空筛选整理自 nextafter() and nexttoward() in C/C++。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。