foo.cc: In function 'int main()':
foo.cc:23:6: warning: unused variable 'q' [-Wunused-variable]
  int q,p,b[c][d],z=0,e=0;
      ^
foo.cc:23:8: warning: unused variable 'p' [-Wunused-variable]
  int q,p,b[c][d],z=0,e=0;
        ^
foo.cc:23:10: warning: variable 'b' set but not used [-Wunused-but-set-variable]
  int q,p,b[c][d],z=0,e=0;
          ^

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