下面的六个程序片段主要完成这些事情：

输出Hello, World
混乱C语言的源代码

下面的所有程序都可以在GCC下编译通过，只有最后一个需要动用C++的编译器g++才能编程通过。

hello1.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>
    _

hello2.c 

    #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++]);
    }

hello3.c

    #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)}

hello4.c

    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++);}

hello5.c

    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]); }

hello6.cpp

下面的程序只能由C++的编译器编译（比如：g++）

    #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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