View Compilation Error

0_0_7420797_24323.cpp: In member function `void mat::show()':
0_0_7420797_24323.cpp:28: error: `cout' undeclared (first use this function)
0_0_7420797_24323.cpp:28: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7420797_24323.cpp:29: error: `endl' undeclared (first use this function)