1比特(bit) = 0.125字节(b)
1千字节(kb) = 1024字节(b)
1兆字节(mb) = 1048576字节(b) ~ 1e6
32位编译器:
char :1个字节
int: 4个字节
unsigned int : 4个字节
float: 4个字节
double: 8个字节
long long: 8个字节
unsigned long: 4个字节
64位编译器:
char :1个字节
int: 4个字节
unsigned int : 4个字节
float: 4个字节
double: 8个字节
long: 8个字节
long long: 8个字节
unsigned long: 8个字节