8.7指针和函数

//值传递
void swap1(int a, int b)
{
  int temp = a;
  a = b;
  b = temp;
}
//地址传递
void swap2(int *p1, int *p2)
{
  int temp;
  *p1 = *p2;
  *p2 = temp;
}

int main()
{
  int a = 10;
  int b = 20;
  swap1(a, b);//值传递不会改变实惨
  cout << "a=" << a << endl;
  cout << "b=" << b << endl;

  swap2(&a, &b);//地址传递会改变实惨
  cout << "a=" << a << endl;
  cout << "b=" << b << endl;
  return 0;
}