/in/foo.cc: In function 'int main()':
/in/foo.cc:12:16: warning: comparison of constant '20' with boolean expression is always true [-Wbool-compare]
   12 |         if(10<P<20)
      |            ~~~~^~~
/in/foo.cc:12:14: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   12 |         if(10<P<20)
      |            ~~^~
/in/foo.cc:25:16: warning: comparison of constant '20' with boolean expression is always true [-Wbool-compare]
   25 |         if(10<P<20)
      |            ~~~~^~~
/in/foo.cc:25:14: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   25 |         if(10<P<20)
      |            ~~^~
/in/foo.cc:38:16: warning: comparison of constant '20' with boolean expression is always true [-Wbool-compare]
   38 |         if(10<P<20)
      |            ~~~~^~~
/in/foo.cc:38:14: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   38 |         if(10<P<20)
      |            ~~^~
/in/foo.cc:51:16: warning: comparison of constant '20' with boolean expression is always true [-Wbool-compare]
   51 |         if(10<P<20)
      |            ~~~~^~~
/in/foo.cc:51:14: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   51 |         if(10<P<20)
      |            ~~^~