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Found this example of quine:
s='s=%r;print(s%%s)';print(s%s)
I get that %s and %r do the str and repr functions, as pointed here, but what exactly means the s%s part and how the quine works?
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Quine is a program which takes no input but outputs a copy of its own code.
A common trick is to jump start the quine by writing a program to read a textfile and output an array of numbers. Then you modify it to use a static array, and run the first program against the new (static array) program, producing an array of number that represents the program.
A polyquine is both quine and polyglot. 1. You are to write a quine which is valid in at least two different languages. This is code golf, so the shortest answer (in bytes) wins.
s is set to:
's=%r;print(s%%s)'
so the %r gets replaced by exactly that (keeping the single quotes) in s%s and the final %% with a single %, giving:
s='s=%r;print(s%%s)';print(s%s)
and hence the quine.
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The operator x % y means substitute the value y in the format string x, same way as C printf. Also note that the %% specifier stands for a literal % sign so s%%s within the format string will print as s%s, and will not capture a string.
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