写一段代码，这段代码就是打印这段代码，谁来试试☻

代码

试试

打印

段

29 条回复 • 2016-05-21 16:51:00 +08:00

1

hanai

2016-05-20 16:42:30 +08:00

1

function funcX() {console.log(arguments.callee.toString())}

2

SakuraSa

2016-05-20 16:46:59 +08:00

2

https://en.wikipedia.org/wiki/Quine_(computing)

3

sinalvee

2016-05-20 16:52:34 +08:00

function func() {
console.log(func);
}

4

yangg

2016-05-20 17:00:03 +08:00

funcX, func 的都不是吧，你们都没调用。
@hanai
@sinalvee

5

6IbA2bj5ip3tK49j

2016-05-20 17:07:50 +08:00 via Android

定位到本文件，读出来，打印……😂

6

cdwyd

2016-05-20 17:08:28 +08:00 via Android

读取源码，然后打印出来？

7

innoink

2016-05-20 17:10:20 +08:00

以前看过好几个 c 语言版本的，看之前还以为 c 语言做不到。。

8

SakuraSa

2016-05-20 17:11:09 +08:00

作为 py 使用者表示， py 写 Quine 还是比较简单的
```python
s = 's = %r\nprint(s%%s)'
print(s%s)
```

9

sinalvee

2016-05-20 17:12:38 +08:00

1

@yangg 好吧，逼我
(function func() {
console.log('(' + func + ')();');
})();

10

kindjeff

2016-05-20 17:13:40 +08:00

1

function a() { console.log(a.toString(), "a()"); } a()

11

GtDzx

2016-05-20 17:15:50 +08:00

@innoink 任何一个图灵完全的语言能能写出无限多种 quine

12

Troevil

2016-05-20 17:16:56 +08:00

@sinalvee 自我补全 lol

13

lovedebug

2016-05-20 17:18:32 +08:00

eval('var a = arguments.callee.toString();console.log(a.slice(a.indexOf("{") + 1, a.lastIndexOf("}")));');

14

congeec

2016-05-20 17:20:09 +08:00

``` C
char*s="char*s=%c%s%c;main(){printf(s,34,s,34);}";main(){printf(s,34,s,34);}
```

15

blahgeek

2016-05-20 17:25:30 +08:00 via iPhone

2

从备忘录里面找出来的：

Quine: Python & Brainfuck

```python
s='s=print s[:2]+chr(39)+s+chr(39)+chr(10)+s[2:]'
print s[:2]+chr(39)+s+chr(39)+chr(10)+s[2:]
```

So … the key is … 把那些在字符串中表达方式不一样的字符用其他方式代替（`”’”`, `”\n ”`）

另外…用`repr`（`%r`）算作弊吧……= =

```python
s='s={};print s.format(repr(s))';print s.format(repr(s))
```

更加 general 的方法：

```python
import sys
w = sys.stdout.write
s = [105,109,112,111,114,116,32,115,121,115,10,119,32,61,32,115,121,115,46,115,116,100,111,117,116,46,119,114,105,116,101,10,115,32,61,32,91,10,119,40,39,39,46,106,111,105,110,40,109,97,112,40,99,104,114,44,32,115,91,58,51,55,93,41,41,41,10,119,40,39,44,39,46,106,111,105,110,40,109,97,112,40,115,116,114,44,32,115,41,41,41,10,119,40,39,39,46,106,111,105,110,40,109,97,112,40,99,104,114,44,32,115,91,51,55,58,93,41,41,41,10
w(''.join(map(chr, s[:37])))
w(','.join(map(str, s)))
w(''.join(map(chr, s[37:])))
```

And … Brainf**k! (use `cat quine.bf | sed 's/#.*//' | tr '\n' ' ' | sed 's/ //g ’`to remove comments and white spaces)

```
# Character map (according to frequency):
# + > < [ ] - .
# 1 2 3 4 5 6 7
# 43 62 60 91 93 45 46

# start
>>>

# data
>++
>++
>++

>++++
>+++
>+++++
>++
>++++
>++++
>+++
>+
>+++
>+
>++
>++
>++++++
>+++++
>+++
>++++
>++
>+
>+++
>++++++
>+++++
>++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>+
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>++++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>+++
>+
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>+++++
>++
>+++++
>+++
>+++
>++++++
>++
>++
>++
>++++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>++
>+
>+
>+
>+
>+
>+
>+
>+
>++++
>+++
>+
>+
>+
>+
>+
>++
>++++++
>+++++
>+++
>+
>+
>+
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>++++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>+++
>++
>+
>+
>+
>+
>++++
>+++
>+
>+
>+
>+
>++
>++++++
>+++++
>+++
>+
>+
>+
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>++++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>+++
>++++++
>++++++
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>++++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>+++
>++
>+
>+
>+
>+
>+
>++++
>+++
>+
>+
>+
>+
>+
>+
>++
>++++++
>+++++
>+++
>+
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>++++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>+++
>+
>+
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>++++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>+++
>++
>+
>+
>+
>+
>+
>+
>+
>++++
>+++
>++++++
>++++++
>++++++
>++++++
>++++++
>++++++
>++++++
>++
>++++++
>+++++
>+++
>+
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>++++
>++++
>++
>+++++
>++
>++++
>++
>+++++
>+++
>+
>++++
>+++
>+++++
>+++
>++++
>+++
>+++++
>++
>++++++
>+++++
>+++++
>+++++
>+++++
>+++++
>+++++
>++
>+++++
>+
>+
>+
>++++
>++
>++++
>+++
>+++
>+
>++
>++
>++++++
>+++++
>+++
>++++
>++
>+
>+++
>++++++
>+++++
>+++
>+++++++
>++
>++
>++++++
>+++++
>+++
>++++
>+++
>+++++
>++++++
>+++
>+
>++++
>+++
>+
>+++++
>+++
>++++
>+++
>+++++
>++
>++++
>+++
>+++
>+
>+
>+
>+
>+
>+
>+
>+
>++++
>++
>+
>+
>+
>+
>+
>+
>+
>+
>+++
>++++++
>+++++
>++
>++++++
>++++++
>+++++++
>+++
>+
>+
>+
>+
>++++
>++
>++++++
>++++++
>++++++
>++++++
>+++
>++++++
>+++++
>++
>++++++
>++++++
>++++++
>++
>++++
>+++
>+++++++
>++
>++++++
>+++++
>+++
>++++
>++++++
>+++++
>++
>++
>+++++
>+
>++++
>++
>+
>+++++
>++
>++
>++++
>+++++++
>++
>+++++

# return to first char
[<] >

# copy data
[ # for each data
[<+<+>>-] # copy to left two cells
<[>+<-]> # copy back from left cell

[>]>[>]+
[<]<[<]>-
[ # while greater than 0
[>]> [>]< +
[<]<[<]> -
]
>
]

<<->>
>

# Apply character map
[
# go to end of data plus 1; adds up to 43
[>]> [>]
>++++++++ # for range(8)
[<+++++>-] # adds 5
<+++ # adds 3
[<]<[<]> # return to the character

- # minus 1

# if greater than 0
[
# total 19
[>]> [>]<
>++++ # for range(4)
[<++++>-] # adds 4
<+++ # adds 3 (19 totally)
[<]<[<]>
-

[
[>]> [>]< -- # 62 to 60
[<]<[<]>
- # minus 1

[
[>]> [>]<
>+++++ # for range(5)
[<++++++>-] # adds 6
<+ # adds 1 (31 totally)
[<]<[<]>
-
[
[>]> [>]< ++ # adds 2
[<]<[<]> # go back to char
- # minus 1
# 93 to 45
[
[>]> [>]<
>+++++++ # for range(7)
[<------->-] # minus 7
<+ # adds 1 (minus 48 totally)
[<]<[<]>
-
[
[>]> [>]< + # adds 1
[<]<[<]> # go back to char
- # minus 1
]
]
]
]
]
]
> # go to next char
]

# Print first 3 ascii
+++
[
# move the data to left cell
> [<<+>>-] <
# move to right cell
[>+<-]
<.>> # print it
-
]

<[<]

# go to orig data
-<

+[<+]
<[<]>

# Print data (data format)
[
<<++++++++ # for range(8)
[>++++++++<-] # plus 8
>-- # 62
. # ">"
# 62 to 43
<++++ # for range(4)
[>----<-] # minus 4
>--- # 43
>
[<.>-] # print "+"
<[-]> # reset left cell to zero
>
]

+[>+] # go until 255
>>
[.>]
```

aka.

```
>>>>++>++>++>++++>+++>+++++>++>++++>++++>+++>+>+++>+>++>++>++++++>+++++>+++>++++>++>+>+++>++++++>+++++>++>++++>++>+++++>++>++++>++>+++++>+>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>++++>++++>++>+++++>++>++++>++>+++++>+++>+>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>+++++>++>+++++>+++>+++>++++++>++>++>++>++++>++++>++>+++++>++>++++>++>+++++>++>+>+>+>+>+>+>+>+>++++>+++>+>+>+>+>+>++>++++++>+++++>+++>+>+>+>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>++++>++++>++>+++++>++>++++>++>+++++>+++>++>+>+>+>+>++++>+++>+>+>+>+>++>++++++>+++++>+++>+>+>+>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>++++>++++>++>+++++>++>++++>++>+++++>+++>++++++>++++++>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>++++>++++>++>+++++>++>++++>++>+++++>+++>++>+>+>+>+>+>++++>+++>+>+>+>+>+>+>++>++++++>+++++>+++>+>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>++++>++++>++>+++++>++>++++>++>+++++>+++>+>+>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>++++>++++>++>+++++>++>++++>++>+++++>+++>++>+>+>+>+>+>+>+>++++>+++>++++++>++++++>++++++>++++++>++++++>++++++>++++++>++>++++++>+++++>+++>+>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>++++>++++>++>+++++>++>++++>++>+++++>+++>+>++++>+++>+++++>+++>++++>+++>+++++>++>++++++>+++++>+++++>+++++>+++++>+++++>+++++>++>+++++>+>+>+>++++>++>++++>+++>+++>+>++>++>++++++>+++++>+++>++++>++>+>+++>++++++>+++++>+++>+++++++>++>++>++++++>+++++>+++>++++>+++>+++++>++++++>+++>+>++++>+++>+>+++++>+++>++++>+++>+++++>++>++++>+++>+++>+>+>+>+>+>+>+>+>++++>++>+>+>+>+>+>+>+>+>+++>++++++>+++++>++>++++++>++++++>+++++++>+++>+>+>+>+>++++>++>++++++>++++++>++++++>++++++>+++>++++++>+++++>++>++++++>++++++>++++++>++>++++>+++>+++++++>++>++++++>+++++>+++>++++>++++++>+++++>++>++>+++++>+>++++>++>+>+++++>++>++>++++>+++++++>++>+++++[<]>[[<+<+>>-]<[>+<-]>[>]>[>]+[<]<[<]>-[[>]>[>]<+[<]<[<]>-]>]<<->>>[[>]>[>]>++++++++[<+++++>-]<+++[<]<[<]>-[[>]>[>]<>++++[<++++>-]<+++[<]<[<]>-[[>]>[>]<--[<]<[<]>-[[>]>[>]<>+++++[<++++++>-]<+[<]<[<]>-[[>]>[>]<++[<]<[<]>-[[>]>[>]<>+++++++[<------->-]<+[<]<[<]>-[[>]>[>]<+[<]<[<]>-]]]]]]>]+++[>[<<+>>-]<[>+<-]<.>>-]<[<]-<+[<+]<[<]>[<<++++++++[>++++++++<-]>--.<++++[>----<-]>--->[<.>-]<[-]>>]+[>+]>>[.>]
```

16

blahgeek

2016-05-20 17:26:43 +08:00 via iPhone

（好像太长了……求不 block ………

17

blahgeek

2016-05-20 17:26:43 +08:00 via iPhone

（好像太长了……求不 block ………

18

oott123

2016-05-20 17:29:59 +08:00

1

要不怎么说 PHP 是世界上最好的语言呢……
<?php
// 随便写啥
highlight_file(__FILE__);
// 也可以随便写啥

逃（。

19

blahgeek

2016-05-20 17:34:42 +08:00 via iPhone

不过最短的应该是：

#!/bin/cat

20

est

2016-05-20 17:38:32 +08:00

@blahgeek 有 python/js 的短么？

>>> 1
1

21

cxbig

2016-05-20 17:43:10 +08:00

1

```php
<?php
echo file_get_contents(__FILE__);
```

22

Balthild

2016-05-20 22:21:20 +08:00 via iPhone

@blahgeek WTF …………

23

Sunyanzi

2016-05-20 23:09:29 +08:00

2

@oott123 @cxbig 其实 php 根本不用这么麻烦 ... 只要不出现 <?php 标签随便写啥都可以 ...

24

cxbig

2016-05-20 23:29:27 +08:00

@Sunyanzi 在我看来那和 console 自动输出上一个命令的 return 值一样，不属于“代码打印代码”的范畴。

25

Goheing

2016-05-20 23:36:33 +08:00

Perl 两行。。。
@ARGV = $0;
print for <>

26

bazingaterry

2016-05-21 00:55:53 +08:00

我来抖机灵，空代码，运行的时候没有输出，算不算打印自身？

27

UnisandK

2016-05-21 01:00:03 +08:00

@bazingaterry 想到一起去了 doge 。。

28

MCVector

2016-05-21 01:22:47 +08:00

```
#include <iostream>
#include <fstream>
int main()
{
std::ifstream f(__FILE__);
std::cout<<f.rdbuf();
f.close();
return 0;
}
```

29

xiamx

2016-05-21 09:46:16 +08:00

#!/bin/cat

30

xjl

2016-05-21 16:51:00 +08:00

Golang:

package main

import "fmt"

func main() {
fmt.Printf("%s%c%s%c\n", s, 0x60, s, 0x60)
}

var s = `package main

import "fmt"

func main() {
fmt.Printf("%s%c%s%c\n", s, 0x60, s, 0x60)
}

var s = `