Why Am I Getting 'Spurious Trailing %' Errors When Printing uint64_t with printf?

Troubleshooting printf uint64_t: Resolving "Spurious Trailing %" Error

When attempting to print a uint64_t data type using the printf function, you may encounter an error indicating "spurious trailing '%" in the format. This issue can be attributed to the following:

Problem:

The C99 standard requires that certain macros, such as PRIu64, be explicitly requested for definition. By default, these macros are not included in the standard library.

Solution:

To resolve this error, you need to add the following preprocessor directive before including the header:

#define __STDC_FORMAT_MACROS

This directive instructs the compiler to define the necessary macros, including PRIu64.

Once this change is made, you can successfully compile your code using printf("%" PRIu64 "n", ui64); to print the uint64_t value.

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