src.cpp:5:1: error: expected constructor, destructor, or type conversion before 'freopen'
freopen("NUMSTEP.INP","r",stdin);
^
src.cpp:6:8: error: expected constructor, destructor, or type conversion before '(' token
freopen("NUMSTEP.OUT","w",stdout);
^
src.cpp:7:1: error: expected unqualified-id before '{' token
{
^