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