[C] const

const是修飾右邊的內容

const int a;
a = 0xAA;

[Error] assignment of read-only variable 'a'

const int * a;	
a = 0xAA; //ok
*a = 0xAA; //error

[Error] assignment of read-only location '*a'

修飾指標變數a

int const * a;	
a = 0xAA; //ok
*a = 0xAA; //error

[Error] assignment of read-only location '*a'

修飾變數a

int * const a;	
a = 0xAA; //error
*a = 0xAA; //ok

[Error] assignment of read-only variable 'a'

修飾*和變數a

int const * const a;	
a = 0xAA;
*a = 0xAA;

[Error] assignment of read-only variable 'a'

[Error] assignment of read-only variable '*a'

#C語言#const範例#const教學