/in/foo.cc: In function 'int main()':
/in/foo.cc:7:6: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(a<b<c)
     ~^~
/in/foo.cc:9:11: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  else if(a<c<b)
          ~^~
/in/foo.cc:11:11: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  else if(b<a<c)
          ~^~
/in/foo.cc:13:11: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  else if(b<c<a)
          ~^~
/in/foo.cc:15:11: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  else if(c<a<b)
          ~^~