unsigned int 0~4294967295
int 2147483648~2147483647
unsigned long 0~4294967295
long 2147483648~2147483647
long long -9223372036854775808~9223372036854775807
unsigned long long的最大值:1844674407370955161
unsigned int 0~4294967295
int 2147483648~2147483647
unsigned long 0~4294967295
long 2147483648~2147483647
long long -9223372036854775808~9223372036854775807
unsigned long long的最大值:1844674407370955161