摘要：先看个例子：#include <stdio.h>#include <stdlib.h>#include <string.h>#include <assert.h>struct helloworld_t{ int num; char helloworld[0];//主要是用来得到一个数组的地址,再由数组的个数来访问};int main(){ struct helloworld_t *p; unsigned int size = sizeof(struct helloworld_t) + strlen("Hello World!\n&quo 阅读全文

摘要：restrict是C99标准中新添加的关键字，对于从C89标准开始起步学习C语言的同学来说（包括我），第一次看到restrict还是相当陌生的。Wikipedia给出的解释如下：In the C programming language, as of the C99 standard, restrict is a keyword that can be used in pointer declarations. The restrict keyword is a declaration of intent given by the programmer to the compiler. It 阅读全文

摘要：转自：瀚海星云 ANSIC版 作者：xhacker一. 不说废话，看代码zjs@xhacker:/tmp$ cat tt.c#include <stdio.h>int main(){ int a = 0x12345678; short *p = (short *)&a; short temp; temp = *p; *p = *(p+1); *(p+1) = temp; printf("%x\n", a);}zjs@xhacker:/tmp$ gcc -O2 tt.czjs@xhacker:/tmp$ ./a.out 12345678zjs@xhacke 阅读全文