什么是 C++ `无符号`？ [关闭]答案

【问题标题】：What is C++ `unsigned`? [closed]什么是 C++ `无符号`？ [关闭]
【发布时间】：2012-11-08 21:34:20
【问题描述】：

C++ 中的类型unsigned 指的是什么？和unsigned int一模一样吗？

[符合质量标准]

【问题讨论】：

-1 表示懒惰的问题 ...

标签： c++

【解决方案1】：

是的，完全一样。请参阅 7.1.6.2 简单类型说明符 [dcl.type.simple] 中的表 10，了解类型说明符列表和相应的指定类型。 unsigned 指定类型“unsigned int”，就像unsigned int 指定类型“unsigned int”一样。

Specifier(s)            Type

_type-name_             the type named
_simple-template-id_    the type as defined in 14.2
char                    “char”
unsigned char           “unsigned char”
signed char             “signed char”
char16_t                “char16_t”
char32_t                “char32_t”
bool                    “bool”
unsigned                “unsigned int”       <<<<<<<<<<<<<
unsigned int            “unsigned int”
signed                  “int”
signed int              “int”
int                     “int”
unsigned short int      “unsigned short int”
unsigned short          “unsigned short int”
unsigned long int       “unsigned long int”
unsigned long           “unsigned long int”
unsigned long long int  “unsigned long long int”
unsigned long long      “unsigned long long int”
signed long int         “long int”
signed long             “long int”
signed long long int    “long long int”
signed long long        “long long int”
long long int           “long long int”
long long               “long long int”
long int                “long int”
long                    “long int”
signed short int        “short int”
signed short            “short int”
short int               “short int”
short                   “short int”
wchar_t                 “wchar_t”
float                   “float”
double                  “double”
long double             “long double”
void                    “void”
auto                    placeholder for a type to be deduced
decltype(_expression_)  the type as defined below

【讨论】：

【解决方案2】：

是的，是一样的。

参考：http://en.cppreference.com/w/cpp/language/types

【讨论】：