View Compilation Error

0_0_3908923_20590.cpp:2: error: expected namespace-name before ';' token
0_0_3908923_20590.cpp:2: error: `<type error>' is not a namespace
0_0_3908923_20590.cpp: In function `int main()':
0_0_3908923_20590.cpp:5: error: `cin' undeclared (first use this function)
0_0_3908923_20590.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3908923_20590.cpp:7: error: `cout' undeclared (first use this function)
0_0_3908923_20590.cpp:7: error: `endl' undeclared (first use this function)