src.cpp:17:1: error: expected constructor, destructor, or type conversion before 'freopen'
freopen("PNUMBER.INP","r",stdin);
^
src.cpp:18:8: error: expected constructor, destructor, or type conversion before '(' token
freopen("PNUMBER.OUT","w",stdout);
^
src.cpp:19:1: error: expected unqualified-id before '{' token
{
^