a、b、c 三个变量，通过引用按顺序循环替换他们的值。

#include<stdio.h>void cyclicSwap(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);cyclicSwap(&a, &b, &c);printf("交换后:\n");printf("a = %d \nb = %d \nc = %d",a, b, c);return 0;
}
void cyclicSwap(int *a,int *b,int *c)
{int temp;// 交换temp = *b;*b = *a;*a = *c;*c = temp;
}

输出结果为：

输入 a, b 和 c 的值: 1 2 3
交换前:
a = 1 
b = 2 
c = 3
交换后:
a = 3 
b = 1 
c = 2