/in/foo.cc: In function 'int main()':
/in/foo.cc:6:17: warning: right operand of comma operator has no effect [-Wunused-value]
    6 |         cin>>T,P;
      |                 ^
/in/foo.cc:9:16: warning: comparison of constant '20' with boolean expression is always true [-Wbool-compare]
    9 |         if(10<P<=20)
      |            ~~~~^~~~
/in/foo.cc:9:14: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
    9 |         if(10<P<=20)
      |            ~~^~
/in/foo.cc:7:9: warning: 'P' is used uninitialized [-Wuninitialized]
    7 |         if(P<=10)
      |         ^~
/in/foo.cc:5:15: note: 'P' was declared here
    5 |         int T,P;
      |               ^