View Compilation Error

0_0_13794635_32035.cpp:2:2: error: expected unqualified-id before numeric constant
  2 using namespace std;
  ^
0_0_13794635_32035.cpp:3:2: error: expected unqualified-id before numeric constant
  3 bool cmop(int a,int b)
  ^
0_0_13794635_32035.cpp:7:2: error: expected unqualified-id before numeric constant
  7 int main()
  ^