使用2种您所选择的语言，写的最小的“相互奎因 ”就可以了。

即，用语言A编写程序P，以语言B输出程序Q的源代码，以使程序Q的输出与P的源代码相同。

空文件不计，“读取源文件并打印”样式的程序也不计。

编辑： P = Q的答案不再计数。

> <>（鱼）和Python-26个字符

"00gr00g:a9*2+$' tnirp'>o<

生成此Python

print "\"00gr00g:a9*2+$' tnirp'>o<"

Python和Ruby，39个字符

这个Python片段

s='puts %%q{s=%r;print s%%s}';print s%s

生成此Ruby代码段

puts %q{s='puts %%q{s=%r;print s%%s}';print s%s}

然后会再次生成初始Python代码段：

$ diff -s mutualquine.py <(ruby <(python mutualquine.py))
Files mutualquine.py and /dev/fd/63 are identical

请注意，这类似于JB的答案。

C和Perl，73岁

这个C：

main(s){printf(s="print q<main(s){printf(s=%c%s%c,34,s,34);}>",34,s,34);}

...输出以下Perl：

print q<main(s){printf(s="print q<main(s){printf(s=%c%s%c,34,s,34);}>",34,s,34);}>

...将C输出回来。

C和C ++，123个字符

这个C（可与gcc v4.3.4编译）：

#include <stdio.h>
main(){char *c="#include <stdio.h>%cmain(){char *c=%c%s%c;printf(c,10,34,c,34);}";printf(c,10,34,c,34);}

输出以下（相同的）C ++（可与g ++ 4.3.4编译，一个警告）：

#include <stdio.h>
main(){char *c="#include <stdio.h>%cmain(){char *c=%c%s%c;printf(c,10,34,c,34);}";printf(c,10,34,c,34);}

这在发布的规则之内。 ：P而且，就像Ventero的一样，这是基于JB的答案。

Java到Python-219

Java：

class Q{public static void main(String[]a){char q=34,c=39;String s="print%sclass Q{public static void main(String[]a){char q=34,c=39;String s=%s%s%s;System.out.printf(s,c,q,s,q,c);}}%s";System.out.printf(s,c,q,s,q,c);}}

蟒蛇：

print'class Q{public static void main(String[]a){char q=34,c=39;String s="print%sclass Q{public static void main(String[]a){char q=34,c=39;String s=%s%s%s;System.out.printf(s,c,q,s,q,c);}}%s";System.out.printf(s,c,q,s,q,c);}}'

利用python允许'使用字符串的事实；这使得在python程序中编写java程序的源代码变得容易得多。

Python + Piet一线：417个字符+ 7391 7107执行代码

这个Python脚本产生了7393 x 2的图像；最右边的2x2块是终止程序的“前哨”；所以我不算那些 第二行是白色。我可能可以通过使用加/减/乘法链而不是朴素的二进制算法来进一步简化piet代码，但是我不想为将来的难题提供解决方案。

由于图像的尺寸太可笑，因此我不打算在此处发布该图像。如果要查看它，请运行python代码，然后将输出通过管道传递到.ppm文件。然后，将.ppm转换为.gif，然后在Rapapaing运行输出。（或者，使用非Web Piet解释器，该解释器会增长.ppm）

A='P=lambda A:reduce(lambda(D,H,B),P:(D[P/3:]+D[:P/3],H[P%3*2:]+H[:P%3*2],B+"".join("%i "%H[(D[0]/P)%2]for P in[1,2,4])),map(" A !        @    B".find,A),([1,3,2,6,4,5],[0,192,192,255,0,255],"P3 %i 2 255 "%(len(A)+2)))[2]+"255 "*4+"0 0 "+"255 "*len(A)*3+"255 0 0 "*2;B=lambda D:["@!%s","@@!%s!"][D%2]%B(D/2)if 1<D else"";print P("".join("A%sB"%B(ord(D))for D in"A=%s;exec A[:-13]"%`A`)+" ");exec A[:-13]';exec A[:-13]

编辑：通过减少变量名的汉明权重来打高尔夫。

少打高尔夫球前木棍：

这是以前的版本，在我意识到可以将它变成单线之前。稍微容易理解。函数P将特殊指令集转换为Piet；函数p接受一个整数并产生指令序列以在堆栈上创建该整数。我只使用指令=,+,:,|，所以这可能会变得更有效率...但是我有点像在源代码中使用成熟的Piet编译器（某种形式）。

s="""def P(s):
 l=len(s)+1;R="P3 %i 2 255 "%(l+2);C=[1,3,2,6,4,5];V=[0,192,192,255,0,255]
 for x in map("=|^+-*/%~>.,:@$?#!".find,"="+s):
  C=C[x//3:]+C[:x//3];V=V[x%3*2:]+V[:x%3*2]
  for i in [1,2,4]:R+="%i "%V[(C[0]//i)%2]
 return R+"255 "*4+"0 0 "+"255 "*l*3+"255 0 0 "*2
p=lambda x:[":+%s","::+%s+"][x%2]%p(x/2)if x/2 else""
print P("".join("|%s!"%k(ord(c))for c in "s="+`s`+";exec s[:-13]"))
exec s[:-13]"""
exec s[:-13]

/Brainf..k/，6988字节

脑干

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>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++>>>+++++++>>>++++>>>++++++++>>>++++++>>>+++>>>+++>>>+++++++>>>++++>>>+++++++++>>>+++++++++>>>+++++++++>>>+++++++++>>>+++++++++>>>+++++++++>>>+++++++++>>>+++++++++>>>+++++++++>>>+++++++++>>>++++++>>>+++++>>>+++++++>>>+++++++>>>+++++++>>>+++++++>>>+++++++++>>>+++++++++++>>>++++++++++>>>+++++++++++>>>++++++>>>+++++++>>>{({}<>)<>}<>{([({})]()<((((()()()()()){}){}){})>){({}()<({}())>){({}()<({}()())>){({}()<({}()())>){({}()<({}())>){({}()<({}((()()()){}()){})>){({}()<({}()())>){({}()<({}(((()()()){}()){}){}())>){({}()<({}()())>){({}()<({}(((()()()()())){}{}){})>){(<{}({}()())>)}}}}}}}}}}{}({}<(<>)<>{({}<>)<>}{}>)(<><>)<>{({}<>)<>}{}<>{({}[()])<>(((((()()()){}())){}{}){}())<>}{}<>(((({})(((()()())){}{}){}())))<>}{}([]){((({}[()])<{({}[()]<({}<({}<>)<>>)>)}{}>)<{({}[()]<<>({}<>)>)}{}>)}{}{<>({}<>)}{}(<>){<<<[<<<]>>>[>++++++++++++++++++++++++++++++++++++++++.<[->.+.->+<<]>+.[-]>>]<[<<<]>>>[<++++++++++++++++++++++++++++++++++++++++>-[<+>-[<++>-[<++>-[<+>-[<++++++++++++++>-[<++>-[<+++++++++++++++++++++++++++++>-[<++>-[<++++++++++++++++++++++++++++++>-[<++>-]]]]]]]]]]<.>>>>]}{}<>

在线尝试！

脑爆裂

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<++>-[<++>-[<+>-[<++++++++++++++>-[<++>-[<+++++++++++++++++++++++++++++>-[<++>-[<++++++++++++++++++++++++++++++>-[<++>-]]]]]]]]]]<.>>>>]}{}<>

在线尝试！

Brain-Flak可能在TIO上超时。

说明

快来了。

Ruby和Python（393 + 413 = 806个字符）

我的答案略有改变。由于我只是对输入进行了硬编码而没有进行任何优化，因此肯定可以减少它。

红宝石（393个字符）

require 'json';s=%q[{"ruby":[" %q[","require 'json';s=##;j=JSON.load s;puts j[l='python'][1].sub('##',j[l][0].delete(' ')+s+j[l][2].delete(' '))"," ]"],"python":["' ''","import json,re;s=##;j=json.loads(s);l='ruby';print(re.sub('##',j[l][0].replace(' ','')+s+j[l][2].replace(' ',''),j[l][1],1))","' ''"]}];j=JSON.load s;puts j[l='python'][1].sub('##',j[l][0].delete(' ')+s+j[l][2].delete(' '))

Python（413个字符）

import json,re;s='''{"ruby":[" %q[","require 'json';s=##;j=JSON.load s;puts j[l='python'][1].sub('##',j[l][0].delete(' ')+s+j[l][2].delete(' '))"," ]"],"python":["' ''","import json,re;s=##;j=json.loads(s);l='ruby';print(re.sub('##',j[l][0].replace(' ','')+s+j[l][2].replace(' ',''),j[l][1],1))","' ''"]}''';j=json.loads(s);l='ruby';print(re.sub('##',j[l][0].replace(' ','')+s+j[l][2].replace(' ',''),j[l][1],1))

蟒2至Befunge 98，94 78

同样，利用Python的两种制作字符串的方式：

蟒蛇：

s='<@,kM%c%cs=%c%s%c;print s%%(39,34,39,s,39,34)%c';print s%(39,34,39,s,39,34)

Befunge 98：

<@,kM'"s='<@,kM%c%cs=%c%s%c;print s%%(39,34,39,s,39,34)%c';print s%(39,34,39,s,39,34)"

python程序将字符串格式化为包括其自身以及单引号和双引号的字符。

Befunge程序的工作方式如下：

• <：向左移动，然后环绕。所以现在我们从右到左执行命令

• "：做到这一点，以便我们遇到的每个字符都被压入堆栈，直到遇到另一个字符为止"，因此我们压入：

  )43,93,s,93,43,93(%s tnirp;'c%)43,93,s,93,43,93(%%s tnirp;c%s%c%=sc%c%Mk,@<'=s
  

  实际上这只是python程序，由于Befunge的打印方式而被反转（这是一个pop + print循环）

• 'M：推入M堆栈。M也是数字77，比"s 推送到堆栈的字符数少1。
• k：将最高值弹出堆栈（M），然后执行多次下一个操作，再加上一个。
• ,：从堆栈中弹出最高值并打印char。
• @：结束程序。

欠载和Betaload，16个字节（无竞争）

欠载：

(a(:^)*a(S)*S):^

Betaload：

((a(:^)*a(S)*S):^)S

Betaload是Underload的超集，因此这可能是两个Underload答案。

这是非竞争性的，因为Betaload是在发布此挑战后创建的。

Clipper和C（111 + 108 = 219个字符）

快船队（111）

?'char*f="%c%cchar*f=%c%s%c;main(){printf(f,63,39,34,f,34,39,10);}%c%c";main(){printf(f,63,39,34,f,34,39,10);}'

C（108）

char*f="%c%cchar*f=%c%s%c;main(){printf(f,63,39,34,f,34,39,10);}%c%c";main(){printf(f,63,39,34,f,34,39,10);}

这有点解决问题，因为：

1. Clipper中的“打印”命令非常简单：?'foo':-)
2. 我基于http://www.nyx.net/~gthompso/quine.htm上的“经典C” quine ，并做了一些修改以挤入?and '。
3. 我没有#include <stdio.h>，所以它给了编译器警告
4. Clipper版本输出的C代码必须避免在我的终端机或Harbor打印例程等中删除由80个字符的列限制引起的换行符。

Python和〜-〜！-77和81 = 158

此Python代码：

q=chr(124);s='@%sq=chr(124);s=%s;print(s%%repr(s))%s:';print(s%(q,repr(s),q))

输出这个〜-〜！码：

@|q=chr(124);s='@%sq=chr(124);s=%s;print(s%%repr(s))%s:';print(s%(q,repr(s),q))|:

绝对可以改善很多，并且从其他答案中采纳了一堆。

Javascript和Windows .bat（71和81）

f=()=>{console.log('echo f='+(f+';f()').replace(/(?=[>^\\])/g,'^'))};f()

和

echo f=()=^>{console.log('echo f='+(f+';f()').replace(/(?=[^>^^^\^\])/g,'^^'))};f()