Printf long long int in C with GCC?

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If you are on windows and using mingw, gcc uses the win32 runtime, where printf needs %I64d for a 64 bit integer. (and %I64u for an unsinged 64 bit integer)

For most other platforms you’d use %lld for printing a long long. (and %llu if it’s unsigned). This is standarized in C99.

gcc doesn’t come with a full C runtime, it defers to the platform it’s running on – so the general case is that you need to consult the documentation for your particular platform – independent of gcc.

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