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C++ offer the programmer a rich assortment of built-in as well as user defined data types. Following table lists down seven basic C++ data types:
| Type | Keyword |
|---|---|
| Boolean | bool |
| Character | char |
| Integer | int |
| Floating point | float |
| Double floating point | double |
| Valueless | void |
| Wide character | wchar_t |
The following table shows the variable type, how much memory it takes to store the value in memory, and what is maximum and minimum value which can be stored in such type of variables.
| Type | Typical Bit Width | Typical Range |
|---|---|---|
| char | 1byte | -128 to 127 or 0 to 255 |
| unsigned char | 1byte | 0 to 255 |
| signed char | 1byte | -128 to 127 |
| int | 4bytes | -2147483648 to 2147483647 |
| unsigned int | 4bytes | 0 to 4294967295 |
| signed int | 4bytes | -2147483648 to 2147483647 |
| short int | 2bytes | -32768 to 32767 |
| unsigned short int | 2bytes | 0 to 65,535 |
| signed short int | 2bytes | -32768 to 32767 |
| long int | 4bytes | -2,147,483,648 to 2,147,483,647 |
| signed long int | 4bytes | -2,147,483,648 to 2,147,483,647 |
| unsigned long int | 4bytes | 0 to 4,294,967,295 |
| float | 4bytes | +/- 3.4e +/- 38 (~7 digits) |
| double | 8bytes | +/- 1.7e +/- 308 (~15 digits) |
| long double | 8bytes | +/- 1.7e +/- 308 (~15 digits) |
| wchar_t | 2 or 4 bytes | 1 wide character |
The sizes of variables might be different from those shown in the above table, depending on the compiler and the computer you are using.
数据来源：http://www.tutorialspoint.com/cplusplus/cpp_data_types.htm
32位与64位操作系统下各类型长度对比：http://blog.csdn.net/sky_qing/article/details/11650497
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原文地址：http://www.cnblogs.com/zhongzhiqiang/p/5792291.html
