foo.cc: In function 'int main()':
foo.cc:17:33: warning: 'number' is used uninitialized [-Wuninitialized]
   17 |     int digitCount = countDigits(number);
      |                      ~~~~~~~~~~~^~~~~~~~
foo.cc:13:9: note: 'number' was declared here
   13 |     int number;
      |         ^~~~~~

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