「直男」與「暖男」的區別——const

 1 int wife = 24;
 2 int girlfriend = 18;
 3 
 4 //直男型
 5 int const * zhi_nan;
 6 zhi_nan = &wife;//正確
 7 zhi_nan = &girlfriend;//正確
 8 *zhi_nan = 20;//錯誤
 9 
10 //暖男型
11 int * const nuan_nan;
12 nuan_nan = &wife;
13 *nuan_nan = 26;//可修改wife值
14 nuan_nan = &girlfriend;//錯誤，不容許指向其餘地址
15 
16 //超級暖男型
17 const int * const superman;//不容許指向其餘地址，也不能修改變量的值
18 superman = &wife;
19 *superman = 28;//錯誤，沒法修改wife值
20 superman = &girlfriend;//錯誤，不容許訪問其餘地址
21 
22 //總結：看const離int近仍是離指針變量名近，離誰近就修飾誰，誰就不能變！