How To Print a uint64_t Value Using printf Without the "spurious trailing '%' in format" Error?

Printing uint64_t with printf

When attempting to print a uint64_t using the printf function, you may encounter the error message "spurious trailing '%' in format". This error is caused by a trailing percent sign (%) in the format string provided to printf. To resolve this issue, follow these steps:

1. Ensure the header is included in your code. This header defines the PRIu64 macro, which provides the correct format specifier for uint64_t.
2. Add the macro definition __STDC_FORMAT_MACROS before including . This macro is necessary to enable the definition of the PRIu64 macro.

#define __STDC_FORMAT_MACROS
#include <inttypes.h>

3. Use the %" PRIu64 " format specifier when passing a uint64_t variable to printf.

uint64_t ui64 = 90;
printf("test uint64_t : %" PRIu64 "\n", ui64);

By following these steps, you can correctly print a uint64_t value using printf without encountering the "spurious trailing '%' in format" error.

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