C++中引用

int main()
{
   int a = 10; 
   //int &b; /* 引用必须初始化 */
   int &b = a; /* 一旦初始化，不可更改 */
   int c = 12; 
   b = 12; /* 赋值 */                                                                        

   cout << "a: " << a << endl;
   cout << "b: " << b << endl;
   cout << "c: " << c << endl;

   return 0;
}

a: 12
b: 12
c: 12