/* 范例：3-16 void指针 */
#include <stdio.h>
void main(void)
{
int a = 6838;
int *p;
printf("&p=%u :%d bytes\n", &p, sizeof(&p));
p = &a;
printf("*p = %d p = %u\n", *p, p);
printf(" a = %d &a = %u", a, &a);
printf("\n-------------------------------------");
/*-------------------------------------------------------------------------*/
int i;
float r;
void *poin = &i; /* 取i的地址存放到指针变量poin中 */
*(int *)poin = 2; /* 设定void类型指针变量poin指向的变量(i)为2 */
poin = &r; /* 取浮点变量r的地址存放到poin，因此目前poin指向变量r */
*(float *)poin = 2.3; /* 按照地址操作值, 将r值设定为2.3 */
printf("\n*poin = %d poin = %u\n", *(int *)poin, poin);
printf("\n*poin = %f poin = %u\n", *(float *)poin, poin);
printf("i = %d &i = %u", i, &i);
getchar();
}
程序执行结果﹕
&p=6618620 :4 bytes
*p = 6838 p = 6618624
a = 6838 &a = 6618624
*poin = 1075000115 poin = 6618612
*poin = 2.300000 poin = 6618612
i = 2 &i = 6618616