#include  <iostream>

using namespace std;

int main( )

{

   void swap(int *p1,int *p2); //函数声明

   int *pointer_1,*pointer_2,a,b; //定义指针变量pointer_1,pointer_2,整型变量a,b

   cin>>a>>b;

   pointer_1=&a; //使pointer_1指向a

   pointer_2=&b; //使pointer_2指向b

   if(a<b) swap(pointer_1,pointer_2); //如果a<b,使*pointer_1和*pointer_2互换

   cout<<"max="<<a<<" min="<<b<<endl; //a已是大数,b是小数

   return 0;

}

void swap(int *p1,int *p2) //函数的作用是将*p1的值与*p2的值交换

{

   int temp;

   temp=*p1;

   *p1=*p2;

   *p2=temp;

}

#include  <iostream>

#include  <stdlib.h>

using namespace std;

void swap1(int p1, int p2);

void swap2(int *p1, int *p2);

void swap3(int &p1, int &p2);

void swap1(int p1, int p2) //函数的作用是将p1的值与p2的值交换

{

	int temp;

	temp = p1;

	p1 = p2;

	p2 = temp;

}

void swap2(int *p1, int *p2) //函数的作用是将*p1的值与*p2的值交换

{

	int temp;

	temp = *p1;

	*p1 = *p2;

	*p2 = temp;

}

void swap3(int &p1, int &p2) //函数的作用是将p1的值与p2的值交换

{

	int temp;

	temp = p1;

	p1 = p2;

	p2 = temp;

}

int main()

{

	int *pointer_1, *pointer_2; //定义指针变量pointer_1,pointer_2,整型变量a,b

	int a, b;

	a = 5;

	b = 6;

	swap1(a, b);

	cout << "a=" << a << " b=" << b << endl;  // 原值不变  a=5  b=6

	a = 5;

	b = 6;

	swap2(&a, &b);

	cout << "a=" << a << " b=" << b << endl;  // 原值改变 a=6  b=5

	a = 5;

	b = 6;

	swap3(a, b);

	cout << "a=" << a << " b=" << b << endl;  // 原值改变 a=6  b=5

	a = 5;

	b = 6;

	pointer_1 = &a; //使pointer_1指向a

	pointer_2 = &b; //使pointer_2指向b

	cout << "pointer_1=" << pointer_1 << "	pointer_2=" << pointer_2 << endl;        // 指针内存地址 pointer_1=000AABBD50    pointer_2=000AABBD55

	cout << "*pointer_1=" << *pointer_1 << "	*pointer_2=" << *pointer_2 << endl;  // 赋值 *pointer_1=5  *pointer_2=6  

	*pointer_1 = 5;

	*pointer_2 = 6;

	swap1(*pointer_1, *pointer_2);

	cout << "pointer_1=" << pointer_1 << " pointer_2=" << pointer_2<< endl;         // 指针内存地址 pointer_1=000AABBD50    pointer_2=000AABBD55

	cout << "*pointer_1=" << *pointer_1 << " *pointer_2=" << *pointer_2 << endl;    // 原值不变 *pointer_1=5  *pointer_2=6  

	*pointer_1 = 5;

	*pointer_2 = 6;

	swap2(pointer_1, pointer_2);

	cout << "pointer_1=" << pointer_1 << " pointer_2=" << pointer_2 << endl;      // 指针内存地址 pointer_1=000AABBD50    pointer_2=000AABBD55

	cout << "*pointer_1=" << *pointer_1 << " *pointer_2=" << *pointer_2 << endl;   // 原值改变 *pointer_1=6  *pointer_2=5  

	*pointer_1 = 5;

	*pointer_2 = 6;

	swap3(*pointer_1, *pointer_2);

	cout << "pointer_1=" << pointer_1 << " pointer_2=" << pointer_2 << endl;       // 指针内存地址 pointer_1=000AABBD50    pointer_2=000AABBD55

	cout << "*pointer_1=" << *pointer_1 << " *pointer_2=" << *pointer_2 << endl;   // 原值改变 *pointer_1=6  *pointer_2=5 

	system("pause");

	return 0;

}

#include <iostream>

using namespace std;

// 函数声明

double getAverage(int arr[], int size);

int main ()

{

   // 带有 5 个元素的整型数组

   int arr[5] = {1000, 2, 3, 17, 50};

   double avg;

   // 传递一个指向数组的指针作为参数

   avg = getAverage( arr, 5 ) ;

   // 输出返回值

   cout << "平均值是：" << avg << endl; 

   return 0;

}