c++关于指针的两个函数

c++关于指针的两个函数，有助于加深对指针的理解。

即对输入的两个整数按大小顺序输出

#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_2cin >> a >> b;pointer_1 = &a;pointer_2 = &b;if (a < b) swap(pointer_1, pointer_2);cout << "max=" << a<<" min=" << b << endl;system("pause");return 0;}void swap(int *p1, int *p2){int temp;temp = *p1;*p1 = *p2;*p2 = temp;}

输入a，b，c 3个整数，按由大到小的顺序输出

#include <iostream>using namespace std;int main(){void exchange(int *q1, int *q2, int *q3);//对exchange函数的声明int a, b, c, *p1, *p2, *p3;cin >> a >> b >> c;//输入3个整数p1 = &a; p2 = &b; p3 = &c;exchange(p1,p2,p3);cout << a << " " << b << " " << c << endl;system("pause");return 0;}void exchange(int *q1, int *q2, int *q3){void swap(int *pt1, int *pt2);//对swap函数的声明if (*q1 < *q2) swap(q1, q2);if (*q1 < *q3) swap(q1,q3);if (*q2 < *q3) swap(q2,q3);}void swap(int *pt1, int *pt2){int temp;temp = *pt1;*pt1 = *pt2;*pt2 = temp;}