不能改变引用的指向

 1 #include <iostream>
 2 #include<exception>
 3 using namespace std;
 4 
 5 int main()
 6 {
 7     int a = 3;
 8     int b = 4;
 9     int & c = a;
10     cout << "c="<<c << endl;
11     c = b;
12     cout << "step1:" << endl;
13     cout << "c="<<c << endl;
14     cout << "输出c等于4，难道改变了引用的指向,使c指向了b!?" << endl;
15     
16     cout << "step2:" << endl;
17     b = 5;
18     cout << "c="<<c << endl;
19     cout << "改变b的值，c并未发生变化，说明c没有指向b" << endl;
20 
21     cout << "step3:" << endl;
22     cout << "a=" << a << endl;
23     cout << "引用就是给变量取别名，c引用a说明c就是a的别名，c=b相当于a=b，其实就是对a进行了赋值操作,所以a的值发生了变化" << endl;
24 
25     cout << "step4:" << endl;
26     a = 6;
27     cout << "c="<<c << endl;
28     cout << "改变a的值，c发生变化，说明c任然是指向a" << endl;
29 
30     cout << endl<<"结论：不能改变引用的指向"<<endl;
31 
32 
33     system("pause");
34     return 0;
35 }