| Type | Implication | Minimum storage space |
| bool | boolean | NA |
| char | character | 8 bits |
| wchar_t | wide character | 16 bits |
| short | short integer | 16 bits |
| int | integer | 16 bits |
| long | long integer | 32 bits |
| float | single-precision floating-point | 6 significant digits |
| double | double-precision floating-point | 10 significant digits |
| long double | extended-precision floating-point | 10 significant digits |
Integral types (except the boolean type) may be either signed or unsigned
Unlike other integral types, there are three distict types for char:
plain char equals to char
signed char
unsigned char
原文：http://www.cnblogs.com/furzoom/p/3803295.html