C语言经典算法100例-066-练习使用指针

题目：

输入3 个数a,b,c，按大小顺序输出。

源码：

#include <stdio.h>#include <stdlib.h>//利用指针排序三个数 a b cint main(){    void swap(int *,int *);    int n1,n2,n3;    int *pointer1,*pointer2,*pointer3;    printf("Please input 3 numbers.\n");    scanf("%d,%d,%d",&n1,&n2,&n3);    pointer1=&n1;    pointer2=&n2;    pointer3=&n3;    if(n1>n2) swap(pointer1,pointer2);    if(n1>n3) swap(pointer1,pointer3);    if(n2>n3) swap(pointer2,pointer3);    printf("The sorted numbers are %4d %4d %4d",n1,n2,n3);    return 0;}void swap(int *p1,int *p2)  //交换两个指针所指的值{    int p;    p=*p1;    *p1=*p2;    *p2=p;}