C/C++ 学习笔记[03].去掉C风格的注释
网上搜索了一大堆去掉/*和*/之间注释的代码,就像<The C Programming Language>练习1-23里有人说的一样
大部分都会被以下的程序broken,这个功能看起来简单,实际上很有难度.网上实现的代码,除了我找到的一个用文件指针实现的没有问题外,其余的都存在各种bug,不信的话就用以下的程序测试一下:-),当然这个程序也不够完善.
还是有限状态自动机实现起来更严谨也容易理解得多:
/* krx123tp.c - a test program to serve as input to krx123*.c
*
* This is a shameless copy of Ben Pfaff's solution, to which I have
* added a few extra statements to further test the candidate programs
* for this exercise. As Ben says, this program already contains lots
* of examples of comments and not-quite-comments. I've just made it
* a little tougher.
*
*/
/* K&R2 1-23: Write a program to remove all comments from a C program.
Don't forget to handle quoted strings and character constants
properly. C comments do not nest.
This solution does not deal with other special cases, such as
trigraphs, line continuation with \, or <> quoting on #include,
since these aren't mentioned up 'til then in K&R2. Perhaps this is
cheating.
Note that this program contains both comments and quoted strings of
text that looks like comments, so running it on itself is a
reasonable test. It also contains examples of a comment that ends
in a star and a comment preceded by a slash. Note that the latter
will break C99 compilers and C89 compilers with // comment
extensions.
Interface: The C source file is read from stdin and the
comment-less output is written to stdout. **/
#include <stdio.h>
int
main(void)
{
/* State machine's current state. */
enum {
PROGRAM,
SLASH,
COMMENT,
STAR,
QUOTE,
LITERAL
} state;
/* If state == QUOTE, then ' or ". Otherwise, undefined. */
int quote;
state = PROGRAM;
for (;;) {
int c = getchar();
if (c == EOF)
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想要终止线程的运行，可以使用以下方法：
1、线程函数返回（最好使用该方法）。
2、通过调用ExitThread函数，线程将自行撤消（最好不使用该方法）。
3、同一个进程或另一个进程中的线程调用TerminateThread函数（应避免使用该方法）。
4、ExitProcess和TerminateProcess函数也可以用� ......
#include <stdio.h>
#include <string.h>
int
main(void)
{
char str[] =
"3BVPSq4xF.K?=u#,"
"G'K<MrDnRr7gH%#,"
"XKf<f%G`w^=?C<#,"
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JAVA和C++都是面向对象语言。也就是说，它们都能够实现面向对象思想（封装，继乘，多态）。
C++能被操作系统（Window，Linux）直接运行，而Java不行，需要有个JVM。
java语言给开发人员提供了更为简洁的语法；取消了指针带来更高的代码质量；完全面向对象，独特的运行机制是其具有天然的可移植性。
1．指针
JAVA ......
JAVA和C++都是面向对象语言。也就是说，它们都能够实现面向对象思想（封装，继乘，多态）。
C++能被操作系统（Window，Linux）直接运行，而Java不行，需要有个JVM。
java语言给开发人员提供了更为简洁的语法；取消了指针带来更高的代码质量；完全面向对象，独特的运行机制是其具有天然的可移植性。
1．指针
JAVA ......
今天看K&R的书的时候顺便温习了C的另一重要数据结构bit-fields，我想bit-fields在编写底层驱动
驱动程序的时候应该比较好用，它可以绕开"&"和"|"进行位操作，而且更加节约内存空间。废话不多说
了，还是先来看看它的真面目吧：
bit-field来源:
bit-field是为了节约存储空间而创造的一种数� ......
