Those aren't trigraphs; those are macros defined in the <iso646.h> header, like this: #define and && #define not ! /* ... and so on */ In C++, they're a

Those aren't trigraphs; those are macros defined in the <iso646.h> header, like this: #define and && #define not ! /* ... and so on */ In C++, they're actually keywords that are built into the language, so you don't need a header then. When people talk about trigraphs in C, they're talking about the trigraphs listed on this page: https://en.cppreference.com/w/c/language/operator_alternative https://en.cppreference.com/w/c/language/operator_alternativ...