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CARM User's Guide
Discontinued
Data Storage Formats
The CARM C Compiler offers a number of basic data types to use in your C programs. The following table lists these data types along with their size requirements and value ranges.
| Data Type | Bits | Bytes | Alignment | Value Range |
|---|---|---|---|---|
| signed char1 | 8 | 1 | 1 | -128 to +127 |
| unsigned char | 8 | 1 | 1 | 0 to 255 |
| signed short1 | 16 | 2 | 2 | -32768 to +32767 |
| unsigned short | 16 | 2 | 2 | 0 to 65535 |
| enum2 | 32 | 4 | 4 | -2147483648 to +2147483647 |
| signed int1 | 32 | 4 | 4 | -2147483648 to +2147483647 |
| unsigned int | 32 | 4 | 4 | 0 to 4294967295 |
| signed long1 | 32 | 4 | 4 | -2147483648 to +2147483647 |
| unsigned long | 32 | 4 | 4 | 0 to 4294967295 |
| signed long long1 | 64 | 8 | 4 | -263 to +263-1 |
| unsigned long long | 64 | 8 | 4 | 0 to 264-1 |
| float | 32 | 4 | 4 | ±1.175494E-38 to ±3.402823E+38 |
| double | 64 | 8 | 4 | ±1.7-308 to ±1.7E+308 |
| pointer | 32 | 4 | 4 | 32-bit Address |
Note
- Signed types are stored in two's complement.
- The enum type is stored using the shortest signed or unsigned integer type required to contain its value.
Other data types, like structures and unions, may contain scalars from this table.
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