1 #include<iostream>
2 using namespace std;
3 //1 引用的概念
4 //2 属于C++编译器对C的扩展，不能用C语言的语法去思考它
5 void main1()
6 {
7 int a = 10;
8 //引用的语法：Type& name=var；
9 int &b = a;//b是a的别名，可通过b操作a
10 b = 100;//相当于把a修改成了100了
11 printf("b:%d\n", b);
12 printf("a:%d\n", a);
13 a = 200;
14 printf("b:%d\n", b);
15 printf("a:%d\n", a);
16 system("pause");
17 return;
18 }
19 //3 普通引用必须要初始化
20 void main2()
21 {
22 int a = 10;
23 int &b = a;
24 //int &c;
25 system("pause");
26 }
27
28 //基础类型的引用
29 void myswap(int a, int b)
30 {
31 int c;
32 c = a;
33 a = b;
34 b = c;
35 }
36
37 void myswap2(int *a, int *b)
38 {
39 int c;
40 c = *a;
41 *a = *b;
42 *b = c;
43 }
44
45 //4 引用作为函数参数声明时不进行初始化
46 void myswap3(int &a, int &b)
47 {
48 int c;
49 c = a;
50 a = b;
51 b = c;
52 }
53
54 void main()
55 {
56 int x, y;
57 x = 10;
58 y = 20;
59 myswap(x, y);
60 printf("x:%d,y:%d\n", x, y);
61
62 myswap2(&x, &y);
63 printf("x:%d,y:%d\n", x, y);
64
65 //a就是x的别名，b就是y的别名
66 myswap3(x, y);
67 printf("x:%d,y:%d\n", x, y);
68
69 system("pause");
70 }
