/in/foo.cc: In function 'int main()':
/in/foo.cc:21:12: warning: 'q' may be used uninitialized in this function [-Wmaybe-uninitialized]
   y=y+(x/p)*q;
       ~~~~~^~
/in/foo.cc:22:4: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
   x=x%p;
   ~^~~~