The different of bit Compiler

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: