数据类型范围

数据类型	最小值	最大值
int	-21474836478	2147483647 (2^31-1)
unsigned int	0	4294967295 (2^32 - 1)
long	-2147483648	2147483647 (2^31 - 1)
unsigned long	0	4294967295 (2^32-1)
long long	-9223372036854775808	9223372036854775807 (2^64-1)
unsigned long long	0	18446744073709551615 (2^64-1)
__int64	-9223372036854775808	9223372036854775807 (2^64-1)

ps：
32位系统long和int一样
64位系统long和long long一样