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C is an extremely conservative language. You don't even get booleans unless you're in C99 and import it.

You do get them without #include <stdbool.h>, you'll just have to contend with ugly spellings like _Bool and _True.

bool, true, and false as native keywords are on track to show up in C23. https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2393.pdf