C++ Data Types
Definition of data types
There are many different types of data. Variables are classified according to their data type, which determines the kind of information that may be stored in them. Computer programs collect pieces of data from the real world and manipulate them in various ways.
There are many different types of data. In the realm of numeric information, for example, there are whole numbers and fractional numbers.
Although C++ offers many data types, in the very broadest sense there are only two: numeric and character. Numeric data types are broken into two additional categories: integer and floating-point.
| Type | Keyword |
| Boolean | bool |
| Character | char |
| Integer | int |
| Floating point | float |
| Double floating point | double |
| Valueless | void |
| Wide character | wchar_t |
Several of the basic types can be modified using one or more of these type modifiers:
- signed
- unsigned
- short
- long
Size and range of datatypes
Table below shows all C++ data types with their typical sizes and ranges.Depending on your operating system, the sizes and ranges may be different.
| Type | Typical Bit Width | Typical Range |
| char | 1byte | -127 to 127 or 0 to 255 |
| unsigned char | 1byte | 0 to 255 |
| signed char | 1byte | -127 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 | Range | 0 to 65,535 |
| signed short int | Range | -32768 to 32767 |
| long int | 4bytes | -2,147,483,647 to 2,147,483,647 |
| signed long int | 4bytes | same as long int |
| 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 |
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