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Make a polyglot generator

A polyglot is a program that runs in several languages.

Your challenge is to:

Choose at least two languages (Different versions count as different languages)

Create a program or function that takes several positive integers (one for each language you chose) and returns a program that:

Is a valid program in all of those languages

When run in language A, outputs the first number; When run in language B, outputs the second number; etcetera. Exiting by error is allowed, as long as the generated program prints the number first

The generator does not need to be in one of your chosen languages.

You can assume the inputted numbers within your chosen languages' limits. For example, if BF is one of your languages, the number for BF will be at most 255.

UPDATE

Explicitly checking the version number or implementation of the language is forbidden. To differentiate, use differences in language features.

Scoring

Your score is [code length] / [number of languages]².

Example:

Let's say you were using JS/Python 3, in a JS program:

(x,y)=>`1//1;'''
console.log(${x})
//''';print(${y})`

Your score would be \$\frac{53}{2^{2}}\$ = 13.25.

The lower your score, the better.

Answer*

# [PHP] => MY-BASIC, PHP 7, PHP 5, PHP 8, Perl 4, Perl 5, : 111 bytes
## Score: 111 / 36 = 3.08



 fn($a,$b,$c,$d,$e,$f)=>"\$n.=\"$a\";
 print \$n.''&0+true?0==''?eval('return 1<=>2;')?$b:$c:$d:(-1**2+1?$e:$f);"

[Try it online!][TIO-koy3y38f]

[PHP]: https://php.net/
[TIO-koy3y38f]: https://tio.run/##FcxLDoMgFAXQOasw5KagvjZiPwMQ2YgTPxCbNJQY7fZpOz2Dk9aUO5fWxBBsDlFiJEyEmbAQPCGUtucD4sUOHOPADUvbM@7Fn4Q4NfW@Hd411grh/Gd8SbH5/dhioTrbt0aUDpPGrLFoeVZV1dbKwevfa3g2jPl5fRcIUlFLV7rRnR6lyV8 "PHP – Try It Online"

**Code generated with 1, 2, 3, 4, 5, 6:**
```
$n.="1";
print $n.''&0+true?0==''?eval('return 1<=>2;')?2:3:4:(-1**2+1?5:6);
```

Relies on my usual trick, `true` added to a numeric value is `1` in PHP but is ignored by perl. And in Perl 4, negation operator `-` takes precedence over exponentiation `**` while in Perl 5 it is the contrary.

Quick answer, I'll try to add languages or shorten the generator later..

**EDIT**: -1 byte, the last `;` is not necessary for an arrow function definition, it belongs to the assignment to the header's variable (moved to footer)

**EDIT 2**: -1 byte by removing the round brackets for `print` and using a space, works in both languages

**EDIT 3**: added MY-BASIC language using these tricks:
 - `.` seems to be a valid character for variables names in MY-BASIC, while it's the concatenation operator in PHP and Perl. Allows at the same time to declare a value for `$n.` in MY-BASIC and `$n` for the others (by concatenation to the undefined var). Double quotes are needed here because of the next point.
 - `'` is the single line comment in MY-BASIC, so the rest of the line is ignored after the var output
 - for the other languages, it concatenates an empty string and then we remove the value of `$n` so that the value is zero like before the edit (thank you, loose types languages!)

**EDIT 4**: taking in account the inputs are positive integers, I removed the single quotes for PHP and Perl

**EDIT 5**: added distinction between PHP 5, 7 and 8:
 - `0==''` was true before PHP 8
 - the spaceship operator `<=>` didn't exist before PHP 7. An `eval` is needed here, not only for PHP 5 not to throw a parse error, but for Perl versions also, where you can eval any incorrect code without errors. The `return` keyword allows to have a return value for the `eval` call in PHP
 - `$n.''-$n` caused an arror in PHP 8, which cannot subtract strings anymore, and was replaced by `$n.''&0` which is actually shorter

If this is an answer to a challenge…

…Be sure to follow the challenge specification. However, please refrain from exploiting obvious loopholes. Answers abusing any of the standard loopholes are considered invalid. If you think a specification is unclear or underspecified, comment on the question instead.
…Try to optimize your score. For instance, answers to code-golf challenges should attempt to be as short as possible. You can always include a readable version of the code in addition to the competitive one. Explanations of your answer make it more interesting to read and are very much encouraged.
…Include a short header which indicates the language(s) of your code and its score, as defined by the challenge.

More generally…

…Please make sure to answer the question and provide sufficient detail.
…Avoid asking for help, clarification or responding to other answers (use comments instead).

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\$\begingroup\$ Why do I get a "Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW) in [...] on line 2"? \$\endgroup\$

Pierre Paquette
– Pierre Paquette

2021年05月22日 16:01:40 +00:00
Commented May 22, 2021 at 16:01
\$\begingroup\$ @PierrePaquette in which language? \$\endgroup\$

Kaddath
– Kaddath

2021年05月24日 07:13:04 +00:00
Commented May 24, 2021 at 7:13
\$\begingroup\$ Sorry! In PHP 7. \$\endgroup\$

Pierre Paquette
– Pierre Paquette

2021年05月24日 20:33:13 +00:00
Commented May 24, 2021 at 20:33
\$\begingroup\$ @PierrePaquette you mean the generator or the generated code? In TIO the PHP version is 7.4 and it works, I've tried on my local server too.. note that the code may output notices, or even errors from the eval'ed code, but it doesn't stop the execution and you should have the final result \$\endgroup\$

Kaddath
– Kaddath

2021年05月25日 09:50:36 +00:00
Commented May 25, 2021 at 9:50

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