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    \$\begingroup\$ 16 C compilers later... +1. \$\endgroup\$ Commented Feb 12, 2018 at 0:33
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    \$\begingroup\$ Cracked! \$\endgroup\$ Commented Feb 12, 2018 at 3:28
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    \$\begingroup\$ For those who don't understand why this has so many upvotes (I 5 minutes ago): The normal signature of main function is main(int argc, char** argv), X takes the place of argc here. Normal C compilers take argc=1 and argv[0] is the path to the executable. \$\endgroup\$ Commented Feb 12, 2018 at 3:58
  • \$\begingroup\$ Why a specific compiler? I get this to work with both GCC and Clang on amd64 and GCC on armhf. \$\endgroup\$ Commented Jun 11, 2021 at 19:21
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    \$\begingroup\$ @OskarSkog: With most ways of running a C program this will output starting at 2. The starting value of X is the number of command-line arguments, and the name of the program being run usually counts as the first argument, so in order to start with X as 0 (and thus start counting from 1), you need to find a compiler, or a way of running a C program, that defies that convention somehow. \$\endgroup\$ Commented Nov 21, 2021 at 19:36