| Compiler | 32 bits | 64 bits |
| char | 1 | 1 |
| char * | 4 | 8 |
| short | 2 | 2 |
| unsigned short | 2 | 2 |
| int | 4 | 4 |
| Int * | 4 | 8 |
| unsigned int | 4 | 4 |
| float | 4 | 4 |
| double | 8 | 8 |
| long | 4 | 8 |
| unsigned long | 4 | 8 |
| long long | 8 | 8 |
Xcode7.0:
C:
unsigned long a = 0xffffffff;//4 bytes long long b = 0xffffffffffffffff;//8 bytes
Swift:
