随机生成3个数，创建3个指针指向这3个数，不改变这3个数，从大到小显示。

题目：随机生成3个数，创建3个指针指向这3个数，不改变这3个数，从大到小显示，具体实现如下：

#include<stdlib.h>
#include<stdio.h>
#include<time.h>
void main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	srand(time(NULL));
	a = 3; //rand() % 10;
	b = 2; //rand() % 10;
	c = 1;// rand() % 10;
	int * pa = &a;
	int * pb = &b;
	int * pc = &c;
	//从小到大
	int * pMin = pa;
	if (*pb < *pMin)
	{
		pMin = pb;
	}
	if (*pc < *pMin)
	{
		pMin = pc;
	}
	printf("数据从小到大:\n");
	if (pMin == pa)
	{
		printf("%d	", *pMin);
		if(*pc < * pb)
		{
			printf("%d	", *pc);
			printf("%d", *pb);
		}
		else
		{
			printf("%d	", *pb);
			printf("%d", *pc);
		}
	}
	else if (pMin == pb)
	{
		printf("%d	", *pMin);
		if (*pc < *pa)
		{
			printf("%d	", *pc);
			printf("%d", *pa);
		}
		else
		{
			printf("%d	", *pa);
			printf("%d", *pc);
		}
	}
	else if (pMin == pc)
	{
		printf("%d	", *pMin);
		if (*pa < *pb)
		{
			printf("%d	", *pa);
			printf("%d", *pb);
		}
		else
		{
			printf("%d	", *pb);
			printf("%d", *pa);
		}
	}
	else
	{
		printf("指针无效.\n");
		return;
	}
	printf("\n");
	//数据从大到小
	int * pMax = pa;
	if (*pb > *pMax)
	{
		pMax = pb;
	}
	if (*pc > *pMax)
	{
		pMax = pc;
	}
	printf("数据从大到小:\n");
	if (pMax == pa)
	{
		printf("%d	", *pMax);
		if (*pc < *pb)
		{
			printf("%d	", *pb);
			printf("%d", *pc);
		}
		else
		{
			printf("%d	", *pc);
			printf("%d", *pb);
		}
	}
	else if (pMax == pb)
	{
		printf("%d	", *pMax);
		if (*pc < *pa)
		{
			printf("%d	", *pa);
			printf("%d", *pc);
		}
		else
		{
			printf("%d	", *pc);
			printf("%d", *pa);
		}
	}
	else if (pMax == pc)
	{
		printf("%d	", *pMax);
		if (*pa < *pb)
		{
			printf("%d	", *pb);
			printf("%d", *pa);
		}
		else
		{
			printf("%d	", *pa);
			printf("%d", *pb);
		}
	}
	else
	{
		printf("指针无效.\n");
		return;
	}
	printf("\n");
	system("pause");
	return;
}

运行效果如图1所示：

图1 运行效果