foo.cc: In function ‘int main()’:
foo.cc:55:9: warning: unused variable ‘a’ [-Wunused-variable]
   55 |     int a,b,c,d,e,f;
      |         ^
foo.cc:55:11: warning: unused variable ‘b’ [-Wunused-variable]
   55 |     int a,b,c,d,e,f;
      |           ^
foo.cc:55:13: warning: unused variable ‘c’ [-Wunused-variable]
   55 |     int a,b,c,d,e,f;
      |             ^
foo.cc:55:15: warning: unused variable ‘d’ [-Wunused-variable]
   55 |     int a,b,c,d,e,f;
      |               ^
foo.cc:55:17: warning: unused variable ‘e’ [-Wunused-variable]
   55 |     int a,b,c,d,e,f;
      |                 ^
foo.cc:55:19: warning: unused variable ‘f’ [-Wunused-variable]
   55 |     int a,b,c,d,e,f;
      |                   ^

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