C语言变态的HelloWorld

C语言变态的HelloWorld

C语言真是世界上最难的语言,所以C++是最恐怖的语言

第一种实现方式,使用宏定义

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// file main.c
#define _________ }
#define ________ putchar
#define _______ main
#define _(a) ________(a);
#define ______ _______(){
#define __ ______ _(0x48)_(0x65)_(0x6C)_(0x6C)
#define ___ _(0x6F)_(0x2C)_(0x20)_(0x77)_(0x6F)
#define ____ _(0x72)_(0x6C)_(0x64)_(0x21)
#define _____ __ ___ ____ _________
#include <stdio.h>
_____

看一下该代码经过预处理之后是什么样子,使用$ gcc -E main.c -o main.i

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// file main.i 看最后的部分,main函数
main(){ putchar(0x48);putchar(0x65);putchar(0x6C);putchar(0x6C); putchar(0x6F);putchar(0x2C);putchar(0x20);putchar(0x77);putchar(0x6F); putchar(0x72);putchar(0x6C);putchar(0x64);putchar(0x21); }

现在我们来解析这段代码,一步一步看

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#include <stdio.h>  //这句之前的都是宏定义,之后的代码在预编译阶段会进行宏替换
_____
>>>> __ ___ ____ _________
-- 先看来第一个 __
>>>> ______ _(0x48)_(0x65)_(0x6C)_(0x6C)
>>>> _______(){ _(0x48)_(0x65)_(0x6C)_(0x6C)
>>>> main(){ putchar(0x48);putchar(0x65);putchar(0x6C);putchar(0x6C);
-- 继续 ___
>>>> _(0x6F)_(0x2C)_(0x20)_(0x77)_(0x6F)
>>>> putchar(0x6F);putchar(0x2C);putchar(0x20);putchar(0x77);putchar(0x6F);
-- 继续 ____
>>>> _(0x72)_(0x6C)_(0x64)_(0x21)
>>>> putchar(0x72);putchar(0x6C);putchar(0x64);putchar(0x21);
-- 最后 _________
>>>> }

由四部分组成,所以得到了上面的那段代码
0x全是16进制数,以ASCII码形式转换成字符,前面是零,不是'鸥'
0x48 > 72 == H
0x65 > 101 == e
0x6c > 108 == l
0x6f > 111 == o
0x2c > 44 == ,
0x20 > 32 == Space(空格)
0x77 > 119 == w
0x72 > 114 == r
0x64 > 100 == d
0x21 > 33 == !

输出结果Hello, world!,你的呢?测试了吗?
此乃没有写返回值类型的main函数噢
好了,就分析这一个,剩下的贴代码,太丧心病狂了

第二种,数组

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#include<stdio.h>
main(){
int x=0,y[14],*z=&y;*(z++)=0x48;*(z++)=y[x++]+0x1D;
*(z++)=y[x++]+0x07;*(z++)=y[x++]+0x00;*(z++)=y[x++]+0x03;
*(z++)=y[x++]-0x43;*(z++)=y[x++]-0x0C;*(z++)=y[x++]+0x57;
*(z++)=y[x++]-0x08;*(z++)=y[x++]+0x03;*(z++)=y[x++]-0x06;
*(z++)=y[x++]-0x08;*(z++)=y[x++]-0x43;*(z++)=y[x]-0x21;
x=*(--z);while(y[x]!=NULL)putchar(y[x++]);
}

第三种,goto子句

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 #include<stdio.h>
#define __(a) goto a;
#define ___(a) putchar(a);
#define _(a,b) ___(a) __(b);
main()
{ _:__(t)a:_('r',g)b:_('$',p)
c:_('l',f)d:_(' ',s)e:_('a',s)
f:_('o',q)g:_('l',h)h:_('d',n)
i:_('e',w)j:_('e',x)k:_('\n',z)
l:_('H',l)m:_('X',i)n:_('!',k)
o:_('z',q)p:_('q',b)q:_(',',d)
r:_('i',l)s:_('w',v)t:_('H',j)
u:_('a',a)v:_('o',a)w:_(')',k)
x:_('l',c)y:_('\t',g)z:___(0x0)}

第四种,调用main函数,好牛

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int n[]={0x48,
0x65,0x6C,0x6C,
0x6F,0x2C,0x20,
0x77,0x6F,0x72,
0x6C,0x64,0x21,
0x0A,0x00},*m=n;
main(n){putchar
(*m)!='\0'?main
(m++):exit(n++);}

第五种,位运算

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main(){int i,n[]={(((1<<1)<<(1<<1)<<(1<<
1)<<(1<<(1>>1)))+((1<<1)<<(1<<1))), (((1
<<1)<<(1<<1)<<(1<<1)<<(1<<1))-((1<<1)<<(
1<<1)<<(1<<1))+((1<<1)<<(1<<(1>>1)))+ (1
<<(1>>1))),(((1<<1)<<(1<<1)<<(1<<1)<< (1
<<1))-((1<<1)<<(1<<1)<<(1<<(1>>1)))- ((1
<<1)<<(1<<(1>>1)))),(((1<<1)<<(1<<1)<<(1
<<1)<<(1<<1))-((1<<1)<<(1<<1)<<(1<<(1>>1
)))-((1<<1)<<(1<<(1>>1)))),(((1<<1)<< (1
<<1)<<(1<<1)<<(1<<1))-((1<<1)<<(1<<1)<<(
1<<(1>>1)))-(1<<(1>>1))),(((1<<1)<<(1<<1
)<<(1<<1))+((1<<1)<<(1<<1)<<(1<<(1>>1)))
-((1<<1)<<(1<<(1>>1)))),((1<<1)<< (1<<1)
<<(1<<1)),(((1<<1)<<(1<<1)<<(1<<1)<<(1<<
1))-((1<<1)<<(1<<1))-(1<<(1>>1))),(((1<<
1)<<(1<<1)<<(1<<1)<<(1<<1))-((1<<1)<< (1
<<1)<<(1<<(1>>1)))-(1<<(1>>1))), (((1<<1
)<<(1<<1)<<(1<<1)<<(1<<1))- ((1<<1)<< (1
<<1)<<(1<<(1>>1)))+(1<<1)), (((1<<1)<< (
1<<1)<<(1<<1)<< (1<<1))-((1<<1)<< (1<<1)
<<(1<<(1>>1)))-((1<<1) <<(1<< (1>>1)))),
(((1<<1)<< (1<<1)<<(1<<1)<< (1<<1))- ((1
<<1)<<(1<<1)<<(1<<1))+((1<<1)<< (1<<(1>>
1)))), (((1<<1)<<(1<<1) <<(1<<1))+(1<<(1
>>1))),(((1<<1)<<(1<<1))+((1<<1)<< (1<<(
1>>1))) + (1<< (1>>1)))}; for(i=(1>>1);i
<(((1<<1) <<(1<<1))+((1 <<1)<< (1<<(1>>1
))) + (1<<1)); i++) printf("%c",n[i]); }

第六种,得使用g++编译,疯狂的自增

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#include <stdio.h>
#define _(_) putchar(_);
int main(void){int i = 0;_(
++++++++++++++++++++++++++++
++++++++++++++++++++++++++++
++++++++++++++++++++++++++++
++++++++++++++++++++++++++++
++++++++++++++++++++++++++++
++++i)_(++++++++++++++++++++
++++++++++++++++++++++++++++
++++++++++i)_(++++++++++++++
i)_(--++i)_(++++++i)_(------
----------------------------
----------------------------
----------------------------
----------------------------
----------------i)_(--------
----------------i)_(++++++++
++++++++++++++++++++++++++++
++++++++++++++++++++++++++++
++++++++++++++++++++++++++++
++++++++++++++++++++++++++++
++++++++++++++++++++++++++++
++++++++++++++++++++++++++i)
_(----------------i)_(++++++
i)_(------------i)_(--------
--------i)_(----------------
----------------------------
----------------------------
----------------------------
----------------------------
------i)_(------------------
----------------------------
i)return i;}
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