有符号整数类型及其对应的无符号整数类型
Signed integer type and its corresponding unsigned integer type
对于每个有符号整数类型，标准保证存在对应的无符号整数类型。 6.2.5 p6:
For each of the signed integer types, there is a corresponding (but
different) unsigned integer type (designated with the keyword unsigned
) that uses the same amount of storage (including sign information)
and has the same alignment requirements.
用关键字 unsigned 指定的短语 让我感到困惑，我查阅了标准的早期版本以了解它是否在那里出现。 C89/3.2.1.5 提供完全相同的措辞：
For each of the signed integer types, there is a corresponding (but
different) unsigned integer type (designated with the keyword
unsigned) that uses the same amount of storage (including sign
information) and has the same alignment requirements.
现在考虑 uintptr_t 和 intptr_t； uintmax_t 和 intmax_t；等等...（这是可选的，但如果实现定义了这些类型）。
问题： 根据我上面引用的定义，uintptr_t 不是 intptr_t 和 uintmax_t 对应的无符号整数类型intmax_t?
对应的无符号整数类型
我很担心，因为通常的算术转换使用术语 6.3.1.8 p1:
Otherwise, both operands are converted to the unsigned integer type
corresponding to the type of the operand with signed integer type
所以我试图理解应用于 uintptr_t 和 intptr_t 的常用算术转换的语义。
标准“7.20.1.5 Greatest-width 整数类型”中的 header 和 header 下的描述，其中两种类型成对描述，假设 uintmax_t 被定义为对应于类型 intmax_t.
的无符号类型
根据 7.20(4)，这些是 typedef 名称，而不是基础类型。
For each type described herein that the implementation provides,261) <stdint.h> shall declare that typedef name and define the associated macros.
7.20.1(1) 说：
When typedef names differing only in the absence or presence of the initial u are defined, they shall denote corresponding signed and unsigned types as described in 6.2.5;
所以我相信这些需要遵循与基本整数类型相同的默认转换规则。
直到 C99 才引入 intN_t 和 uintN_t 固定宽度类型，所以这可能就是您引用的标准缺少有关它们的信息的原因。
对于每个有符号整数类型，标准保证存在对应的无符号整数类型。 6.2.5 p6:
For each of the signed integer types, there is a corresponding (but different) unsigned integer type (designated with the keyword
unsigned) that uses the same amount of storage (including sign information) and has the same alignment requirements.
用关键字 unsigned 指定的短语 让我感到困惑，我查阅了标准的早期版本以了解它是否在那里出现。 C89/3.2.1.5 提供完全相同的措辞：
For each of the signed integer types, there is a corresponding (but different) unsigned integer type (designated with the keyword
unsigned) that uses the same amount of storage (including sign information) and has the same alignment requirements.
现在考虑 uintptr_t 和 intptr_t； uintmax_t 和 intmax_t；等等...（这是可选的，但如果实现定义了这些类型）。
问题： 根据我上面引用的定义，uintptr_t 不是 intptr_t 和 uintmax_t 对应的无符号整数类型intmax_t?
我很担心，因为通常的算术转换使用术语 6.3.1.8 p1:
Otherwise, both operands are converted to the unsigned integer type corresponding to the type of the operand with signed integer type
所以我试图理解应用于 uintptr_t 和 intptr_t 的常用算术转换的语义。
标准“7.20.1.5 Greatest-width 整数类型”中的 header 和 header 下的描述，其中两种类型成对描述，假设 uintmax_t 被定义为对应于类型 intmax_t.
根据 7.20(4)，这些是 typedef 名称，而不是基础类型。
For each type described herein that the implementation provides,261)
<stdint.h>shall declare that typedef name and define the associated macros.
7.20.1(1) 说：
When typedef names differing only in the absence or presence of the initial u are defined, they shall denote corresponding signed and unsigned types as described in 6.2.5;
所以我相信这些需要遵循与基本整数类型相同的默认转换规则。
直到 C99 才引入 intN_t 和 uintN_t 固定宽度类型，所以这可能就是您引用的标准缺少有关它们的信息的原因。