View Compilation Error

0_0_2046879_27612.cpp:10: error: ISO C++ forbids declaration of `ostream' with no type
0_0_2046879_27612.cpp:10: error: `ostream' is neither function nor member function; cannot be declared friend
0_0_2046879_27612.cpp:10: error: expected `;' before '&' token
0_0_2046879_27612.cpp:17: error: expected `;' before "HP"
0_0_2046879_27612.cpp: In member function `HP HP::operator=(const char*)':
0_0_2046879_27612.cpp:28: error: `strlen' undeclared (first use this function)
0_0_2046879_27612.cpp:28: error: (Each undeclared identifier is reported only once for each function it appears in.)