/**
 * file: main.c
 * author: 简单教程(www.twle.cn)
 */

#include<stdio.h>

void cyclic_swap(int *a,int *b,int *c);

int main()
{
    int a, b, c;

    printf("输入 a, b 和 c 的值: ");
    scanf("%d %d %d",&a,&b,&c);

    printf("交换前:\n");
    printf("a = %d \nb = %d \nc = %d\n",a,b,c);

    cyclic_swap(&a, &b, &c);

    printf("交换后:\n");
    printf("a = %d \nb = %d \nc = %d\n",a, b, c);

    return 0;
}
void cyclic_swap(int *a,int *b,int *c)
{

    int temp;

    // 交换
    temp = *b;
    *b = *a;
    *a = *c;
    *c = temp;
}

$ gcc main.c && ./a.out
输入 a, b 和 c 的值: 17 29 37
交换前:
a = 17
b = 29
c = 37
交换后:
a = 37
b = 17
c = 29