/in/foo.cc: In function 'int main()':
/in/foo.cc:13:24: warning: comparison of constant '20' with boolean expression is always true [-Wbool-compare]
   13 |                 if(10<p<=20)
      |                    ~~~~^~~~
/in/foo.cc:13:22: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   13 |                 if(10<p<=20)
      |                    ~~^~
/in/foo.cc:5:13: warning: unused variable 'P' [-Wunused-variable]
    5 |         int P,T;
      |             ^