“++”的前置与后置
racke 2004-09-06 08:22:47 “++”的前置与后置有什么区别。
/* order.c -- precedence in pointer operations */
#include <stdio.h>
int data[2] = {100, 200};
int moredata[2] = {300, 400};
int main(void)
{
int * p1, * p2, * p3;
p1 = p2 = data;
p3 = moredata;
printf(" *p1 = %d, *p2 = %d, *p3 = %d\n",
*p1 , *p2 , *p3);
printf("*p1++ = %d, *++p2 = %d, (*p3)++ = %d\n",
*p1++ , *++p2 , (*p3)++);
printf(" *p1 = %d, *p2 = %d, *p3 = %d\n",
*p1 , *p2 , *p3);
return 0;
}
Here is its output:
*p1 = 100, *p2 = 100, *p3 = 300
*p1++ = 100, *++p2 = 200, (*p3)++ = 300
*p1 = 200, *p2 = 200, *p3 = 301
为何*p1++ = 100?