概述
https://docs.microsoft.com/en-us/cpp/cpp/data-type-ranges?view=vs-2019
https://www.geeksforgeeks.org/c-data-types/
| Data Type | Size (in bytes) | Range |
|---|---|---|
| short int | 2 | -32,768 to 32,767(-2^15~~2^15-1) |
| unsigned short int | 2 | 0 to 65,535(0~2^16-1) |
| unsigned int | 4 | 0 to 4,294,967,295(0~2^32-1) |
| int | 4 | -2,147,483,648 to 2,147,483,647(-2^31~2^31-1) |
| long int | 4 | -2,147,483,648 to 2,147,483,647(-2^31~2^31-1) |
| unsigned long int | 4 | 0 to 4,294,967,295(0~2^32-1) |
| long long int | 8 | -(2^63) to (2^63)-1 |
| unsigned long long int | 8 | 0 to 18,446,744,073,709,551,615(0~2^64-1) |
| signed char | 1 | -128 to 127(-2^8~2^8-1) |
| unsigned char | 1 | 0 to 255(0~2^8-1) |
| float | 4 | |
| double | 8 | |
| long double | 12 | |
| wchar_t | 2 or 4 | 1 wide character |
| 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 by using /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 | |
| 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
|
最后
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