C++ 引用

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#include <iostream>

using namespace std;

typedef struct {
  int x;
  int y;
}Coord;


void func(int &a, int &b);

int main(int argc, const char * argv[]) {
  // 引用：必须要初始化
//  int a = 3;

//  类型 *&指针引用名 = 指针;
//  int a = 10;
//  int *p = &a;
//  int *&q = p;
//  *q = 20;
//  cout << a << endl;

  int a = 10;
  int &b = a;
  b = 20;
  cout << a << endl;
  cout << b << endl;

  Coord c;
  Coord &c1 = c;
  c1.x = 20;
  c1.y = 30;
  cout << c.x << ' ' << c.y << endl;


  int a1 = 10;
  int a2 = 40;

  cout << a1 << ' ' << a2 << endl;
  func(a1, a2);
  cout << a1 << ' ' << a2 << endl;

  return 0;
}


void func(int &a, int &b) {
  int c = 0;
  c = a;
  a = b;
  b = c;
}

http://blog.csdn.net/Simba888888/article/category/1464971/4