Integer values can be specified with decimal, hexadecimal or octal symbols, and can be preceded by an optional symbol (-
or
+)。
If octal symbols are used, numbers must be preceded by.
0 (zero) must be added before the hexadecimal symbol number.
0x .
Internationalorganizations (same as international organizations)
The length of is the same as the machine word length. On 16-bit compiler, the length of int is 16 bits, and on 32-bit compiler, it is 32 bits.