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数据类型的范围属于编程的细节，容易被忽略，自然就容易犯错。下面的表格转自MSDN:
| Type Name | Bytes | Other Names | Range of Values |
|---|
int | 4 | signed | –2,147,483,648 to 2,147,483,647 | unsigned int | 4 | unsigned | 0 to 4,294,967,295 | __int8 | 1 | char | –128 to 127 | unsigned __int8 | 1 | unsigned char | 0 to 255 | __int16 | 2 | short, short int, signed short int | –32,768 to 32,767 | unsigned __int16 | 2 | unsigned short, unsigned short int | 0 to 65,535 | __int32 | 4 | signed, signed int, int | –2,147,483,648 to 2,147,483,647 | unsigned __int32 | 4 | unsigned, unsigned int | 0 to 4,294,967,295 | __int64 | 8 | long long, signed long long | –9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 | unsigned __int64 | 8 | unsigned long long | 0 to 18,446,744,073,709,551,615 | bool | 1 | none | false or true | char | 1 | none | –128 to 127 by default 0 to 255 when compiled with /J | signed char | 1 | none | –128 to 127 | unsigned char | 1 | none | 0 to 255 | short | 2 | short int, signed short int | –32,768 to 32,767 | unsigned short | 2 | unsigned short int | 0 to 65,535 | long | 4 | long int, signed long int | –2,147,483,648 to 2,147,483,647 | unsigned long | 4 | unsigned long int | 0 to 4,294,967,295 | long long | 8 | none (but equivalent to __int64) | –9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 | unsigned long long | 8 | none (but equivalent to unsigned __int64) | 0 to 18,446,744,073,709,551,615 | enum | varies | none | See Remarks. | float | 4 | none | 3.4E +/- 38 (7 digits) | double | 8 | none | 1.7E +/- 308 (15 digits) | long double | same as double | none | same as double | wchar_t | 2 | __wchar_t | 0 to 65,535 |
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