/in/foo.cc: In function 'int main()':
/in/foo.cc:7:8: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(j=A)
        ^
/in/foo.cc:10:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(j=P)
         ^
/in/foo.cc:7:6: warning: 'A' is used uninitialized in this function [-Wuninitialized]
  if(j=A)
     ~^~
/in/foo.cc:10:7: warning: 'P' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(j=P)
      ~^~