/in/foo.cc: In function 'int main()':
/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:8:16: warning: 'R' may be used uninitialized [-Wmaybe-uninitialized]
    8 |          cout<<R;
      |                ^
/in/foo.cc:5:15: note: 'R' was declared here
    5 |         int P,R,L;
      |               ^
/in/foo.cc:10:16: warning: 'L' is used uninitialized [-Wuninitialized]
   10 |          cout<<L;
      |                ^
/in/foo.cc:5:17: note: 'L' was declared here
    5 |         int P,R,L;
      |                 ^