screenshot of a terminal displaying the numbers 64 (100 in hex) and 256 (0x100 in decimal) repeatedly

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   luna, only carbon now (luna@pony.social)'s status on Monday, 10-Mar-2025 21:24:37 JST luna, only carbon now

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   Consider this code. One thread repeatedly prints the number 100 in decimal to std::cout. Another thread repeatedly prints the number 0x100 in hex (which will output as '100') to std::cout.

   You might reasonably expect that the output will simply be '100' over and over and over.

   Unfortunately, the calls to operator<< can get interleaved so you end up with crosstalk of the format specifiers: