/in/foo.cc: In function 'int main()':
/in/foo.cc:20:6: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
      if(b<0)
      ^~
/in/foo.cc:22:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   if(b==0)
   ^~
/in/foo.cc:26:6: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
      if(a<0)
      ^~
/in/foo.cc:28:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   if(a==0)
   ^~
/in/foo.cc:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<command.size();i++)
              ~^~~~~~~~~~~~~~~