“直男”与“暖男”的区别——const

 1 int wife = 24;
 2 int girlfriend = 18;
 3 
 4 //直男型
 5 int const * zhi_nan;
 6 zhi_nan = &wife;//正确
 7 zhi_nan = &girlfriend;//正确
 8 *zhi_nan = 20;//错误
 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;//错误，不允许指向其他地址
15 
16 //超级暖男型
17 const int * const superman;//不允许指向其他地址，也不能修改变量的值
18 superman = &wife;
19 *superman = 28;//错误，无法修改wife值
20 superman = &girlfriend;//错误，不允许访问其他地址
21 
22 //总结：看const离int近还是离指针变量名近，离谁近就修饰谁，谁就不能变！