# 标准库limits.h

常用的INT_MIN和INT_MAX表示最小最大整数的宏。

## 宏常量

| name       | expresses                                                    | possible value*                              |
| ---------- | ------------------------------------------------------------ | -------------------------------------------- |
| CHAR_BIT   | Number of bits in a `char` object (byte)                     | `8` or greater*                              |
| SCHAR_MIN  | Minimum value for an object of type `signed char`            | `-127` (`-27+1`) or less*                    |
| SCHAR_MAX  | Maximum value for an object of type `signed char`            | `127` (`27-1`) or greater*                   |
| UCHAR_MAX  | Maximum value for an object of type `unsigned char`          | `255` (`28-1`) or greater*                   |
| CHAR_MIN   | Minimum value for an object of type `char`                   | either SCHAR_MIN or `0`                      |
| CHAR_MAX   | Maximum value for an object of type `char`                   | either SCHAR_MAX or UCHAR_MAX                |
| MB_LEN_MAX | Maximum number of bytes in a multibyte character, for any locale | `1` or greater*                              |
| SHRT_MIN   | Minimum value for an object of type `short int`              | `-32767` (`-215+1`) or less*                 |
| SHRT_MAX   | Maximum value for an object of type `short int`              | `32767` (`215-1`) or greater*                |
| USHRT_MAX  | Maximum value for an object of type `unsigned short int`     | `65535` (`216-1`) or greater*                |
| INT_MIN    | Minimum value for an object of type `int`                    | `-32767` (`-215+1`) or less*                 |
| INT_MAX    | Maximum value for an object of type `int`                    | `32767` (`215-1`) or greater*                |
| UINT_MAX   | Maximum value for an object of type `unsigned int`           | `65535` (`216-1`) or greater*                |
| LONG_MIN   | Minimum value for an object of type `long int`               | `-2147483647` (`-231+1`) or less*            |
| LONG_MAX   | Maximum value for an object of type `long int`               | `2147483647` (`231-1`) or greater*           |
| ULONG_MAX  | Maximum value for an object of type `unsigned long int`      | `4294967295` (`232-1`) or greater*           |
| LLONG_MIN  | Minimum value for an object of type `long long int`          | `-9223372036854775807` (`-263+1`) or less*   |
| LLONG_MAX  | Maximum value for an object of type `long long int`          | `9223372036854775807` (`263-1`) or greater*  |
| ULLONG_MAX | Maximum value for an object of type `unsigned long long int` | `18446744073709551615` (`264-1`) or greater* |


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