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1\$\begingroup\$ Related. \$\endgroup\$Neil– Neil2025年06月28日 14:30:51 +00:00Commented Jun 28 at 14:30
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1\$\begingroup\$ Related: Input ∩ Source Code, Counting characters, \$\endgroup\$xnor– xnor2025年06月28日 18:05:28 +00:00Commented Jun 28 at 18:05
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3\$\begingroup\$ For many languages (not just Zsh as in @pxeger's answer) an empty program produces empty output, which is falsy whereas non-empty output is truthy; and falsy / truthy is an acceptable output criterion in decision problems. So the empty program will (uninterestingly) fulfill the challenge requirements \$\endgroup\$Luis Mendo– Luis Mendo2025年06月28日 20:18:35 +00:00Commented Jun 28 at 20:18
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4\$\begingroup\$ I note that this question is tagged [quine] but does not seem to invoke the rules for quine-related challenges, which prohibit reading the source. Perhaps it should be tagged [self-referential] instead. \$\endgroup\$Steve Bennett– Steve Bennett2025年06月29日 12:42:24 +00:00Commented Jun 29 at 12:42
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\$\begingroup\$ Very related / possibly a duplicate (only difference is that this challenge asks for a character as input, and that challenge for a substring 🤷). EDIT: Based on the difference in answers, it seems to be different enough to not warrant a duplicate imo. \$\endgroup\$Kevin Cruijssen– Kevin Cruijssen2025年06月30日 09:21:54 +00:00Commented Jun 30 at 9:21