foo.cc: In function 'int main()':
foo.cc:12:9: warning: unused variable 'a' [-Wunused-variable]
   12 |     int a,b,c;
      |         ^
foo.cc:12:11: warning: unused variable 'b' [-Wunused-variable]
   12 |     int a,b,c;
      |           ^
foo.cc:12:13: warning: unused variable 'c' [-Wunused-variable]
   12 |     int a,b,c;
      |             ^

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