不看会后悔的100个超有趣骚操作/冷知识（二）

最新推荐文章于 2021-03-04 12:30:00 发布

原创最新推荐文章于 2021-03-04 12:30:00 发布 · 429 阅读

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这篇博客分享了几个在C/C++编程中可能遇到的奇特语法，包括使用非字母数字字符作为标识符、不寻常的预处理器宏定义以及在行尾使用反斜杠等。作者还展示了如何通过#define创建潜在的混淆代码，并提到了一个Python解释器自我迭代的示例。

上一弹地址：
https://blog.youkuaiyun.com/点我访问/article/details/105419638
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C/C++

32. 当真？

你肯定听说过标识符只能有以下一些组成：
qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM2345678901
但是，以下语句在C/C++（我用的是GCC）中是合法的：

_$(int $,char** $$){int $$$=$;return $$[$$$];}

（我绝对没用VC）

33. 又是奇怪的东西

//only run on windows or linux
#include<stdio.h>
char gc(){
	getchar();
	#ifdef _WIN32
	return (stdin->_ptr)[-1];
	#else
	return (stdin->ptr)[-1];
	#endif 
}

这就是“不用char c=getchar()也知道返回值”

34.任何在行末的`\`都是合法的

while(x-->    \
		       \
			    \
			     \
			      \
					0){
		printf("%d",x);
	}

35.为所欲为的#define

#define x(v)
x(@#$%^&*&^%$#@!~!@#$%^7`1`1
x)

完全合法

36.无尽的bug(c++)

i<i<i<i<i<i<i> > > > > >

37.hack库

//举例子，stdio.h中，
#ifndef _FILE_DEFINED
  struct _iobuf {
    //……
  };
  typedef struct _iobuf FILE;
#define _FILE_DEFINED

#define _FILE_DEFINED
typedef struct _iobuf{/*...*/}FILE;
#include<stdio.h>

python

38.python解释器实现python解释器

while 1:
	try:
		exec(input(">>>").replace("\\t","\t").replace("\\n","\n"))
	except BaseException as e:
		print(e)
		continue
	else:
		pass
	finally:
		pass