/in/foo.cc: In function 'int main()':
/in/foo.cc:7:4: error: expected ';' before 'if'
    7 | (1) if(P<=10)
      |    ^~~
      |    ;
/in/foo.cc:7:2: warning: statement has no effect [-Wunused-value]
    7 | (1) if(P<=10)
      | ~^~
/in/foo.cc:9:4: error: expected ';' before 'if'
    9 | (2) if(10<P<=20)
      |    ^~~
      |    ;
/in/foo.cc:9:2: warning: statement has no effect [-Wunused-value]
    9 | (2) if(10<P<=20)
      | ~^~
/in/foo.cc:11:4: error: expected ';' before 'if'
   11 | (3) if(P>20)
      |    ^~~
      |    ;
/in/foo.cc:11:2: warning: statement has no effect [-Wunused-value]
   11 | (3) if(P>20)
      | ~^~
/in/foo.cc:5:15: warning: unused variable 'T' [-Wunused-variable]
    5 |         int P,T;
      |               ^