指针练习2

//输入3个数a,b,c，按大小顺序输出。利用指针方法

#include <stdio.h>
#include <stdlib.h>

void swap(int *, int *);

int main()
{
    int n1, n2, n3;
    int *pointer1, *pointer2, *pointer3;

    printf("Please input 3 number ~n1,n2,n3:");

    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:%d,%d,%d\n", n1, n2, n3);

    return 0;
}

void swap(int *p1, int *p2)//这里我们要注意，因为我们用了指针，我们通过指针改变的是n1,n2,n3里面的值

{

    int p;
    p = *p1;
    *p1 = *p2;
    *p2 = p;
}