c - 如何在C中打印long double的范围

Question

在尝试用 C 打印 Long Double 的最大和最小范围时，我偶然发现了不同格式说明符的问题，因此我尝试了在以下代码中找到的所有建议:

#include<stdio.h>
#include<limits.h>
#include<float.h>
#include<math.h>
int main(void)
{
    printf("Data Type    Memory Size                  Range\n");
    printf("-------------------------------------------------------------     \n");
    printf("long double    %d bytes          %Lf to %Lf      |>(using %%Lf   as format specifier)\n",sizeof(long double),LDBL_MIN,LDBL_MAX);
    printf("long double    %d bytes          %lf to %lf      |>(using %%lf    as format specifier)\n",sizeof(long double),LDBL_MIN,LDBL_MAX);
    printf("long double    %d bytes                 %LG to %LG       |>    (using %%LG as format specifier)\n",sizeof(long double),LDBL_MIN,LDBL_MAX);
    printf("long double    %d bytes     %E to %E |>(using %%E as format   specifier)\n",sizeof(long double),LDBL_MIN,LDBL_MAX);
    printf("long double    %d bytes     %e to %e |>(using %%e as format specifier)\n",sizeof(long double),LDBL_MIN,LDBL_MAX);
    printf("long double    %d bytes          %llf to %llf      |>(using %%llF as format specifier)\n",sizeof(long double),LDBL_MIN,LDBL_MAX);
    printf("long double    %d bytes     %le to %le |>(using %%le as format specifier)\n",sizeof(long double),LDBL_MIN,LDBL_MAX);
    printf("long double    %d bytes          %f to %f      |>(using %%f as format specifier)\n",sizeof(long double),LDBL_MIN,LDBL_MAX);
    printf("-------------------------------------------------------------\n");
    printf("NOTE: I'm trying to find the range of long double!\n");
    printf("      But none of the format specifiers seems to work! Please Help...\n");
    return 0;
}

但是输出是:

根据https://www.tutorialspoint.com/cprogramming/c_data_types.htm

long double 的内存大小:10 个字节(我知道这可能会有所不同)

长 double 值的范围:3.4E-4932 到 1.1E+4932

*但是我的代码的输出与 3.4E-4932 到 1.1E+4932 相差甚远。但为什么呢？

Answer 1

编译器警告未完全启用。

许多编译器指出 printf() 说明符不匹配

<小时/>

说明符与long double和size_t(sizeof的返回类型)不匹配@melpomene

L Specifies that a following a, A, e, E, f, F, g, or G conversion specifier applies to a long double argument. C11dr §7.21.6.1 7

// wrong specifiers
printf("long double    %d bytes     %E to %E |>(using %%E as format   specifier)\n",
    sizeof(long double),LDBL_MIN,LDBL_MAX);
// Correct specifiers
printf("long double    %zu bytes     %LE to %LE |>(using %%E as format   specifier)\n",
    sizeof(long double),LDBL_MIN,LDBL_MAX);