/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: expected ';' before 'if'
  if(b!=4 || b!=6 || b!=9 || b!=11 || b!=2)
  ^~
/in/foo.cc:10:2: warning: right operand of comma operator has no effect [-Wunused-value]
  }
  ^
/in/foo.cc:11:2: error: 'else' without a previous 'if'
  else if(b==4 || b==6 || b==9 || b==11)
  ^~~~