写一行C程序，其输出是程序本身 [英] write a single line C program whose output is the program itself

问题描述

大家好，


我有一个愚蠢的问题...（可能是）


我们可以编写单行C程序它的输出是程序

本身？


有人知道答案请告诉我。


Puneet

Hi ALL,

I have a silly question... (may be)

Can we write a single line C program whose output is the program
itself?

Is anybody know the answer please tell me.

Puneet

推荐答案

c标准没有说明程序在内存中的含义。

所以制作一个在每个系统上执行此操作的程序可能无法实现
。

在某些系统（如Windows）上，如果编译程序时没有任何

优化所有内容通常都会在你编写

程序时结束。这意味着以下内容将在某些

系统上打印出来：


int main（无效）

{

unsigned char * pCur =（unsigned char *）main，* pEnd =（unsigned

char *）emptyfunc;

while（pCur< pEnd ）printf（"％c"，* pCur ++）;

}


void emptyfunc（void）

{

返回;

}


这不是你想要做的事情。

得到一个反汇编程序要好得多。


-

bjrnove

The c standard doesn''t say anything about how a program is in memory.
So to make a program that does this on every system will probably not
be possible.
On some systems (like windows), if you compile your program without any
optimisation everything usaly end up in memory almost as you write the
program. This means that the following would print out it self on some
systems:

int main(void)
{
unsigned char *pCur = (unsigned char*)main, *pEnd = (unsigned
char*)emptyfunc;
while(pCur < pEnd) printf("%c", *pCur++);
}

void emptyfunc(void)
{
return;
}

This isn''t something you usaly would want to do. It''s much bether to
get a disassembler.

--
bjrnove

我忘了声明emtyfunc，所以你必须在main之前添加

void emptyfunc（）;

。 :-)


-

bjrnove

I forgot to declare emtyfunc, so you will have to add
void emptyfunc();
before main. :-)

--
bjrnove

Puneet说，3 / 16/2005 3:53 PM：

Puneet said,on 3/16/2005 3:53 PM:

大家好，

我有一个愚蠢的问题......（可能是）

我们可以写一个单行C程序，其输出是程序本身？

有人知道答案请告诉我。

Puneet

Hi ALL,

I have a silly question... (may be)

Can we write a single line C program whose output is the program
itself?

Is anybody know the answer please tell me.

Puneet

google for Quine ...

你会得到很多这样的程序......


-

Shanmu。

google for Quine...
you''ll get lots of such programs...

--
Shanmu.

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