ARM > Efficient C for ARM > C Data Types
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Certain C data types are more efficient to use for local variables than others.
Therefore the machine’s natural word type, int, is 32-bit.
| C Data Type | Implementation |
|---|---|
char |
unsigned 8-bit byte |
short |
signed 16-bit halfword |
int |
signed 32-bit word |
long |
signed 32-bit word |
long long |
signed 64-bit double word |