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 c

int 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;

}