View Compilation Error

0_0_2812900_3548.cpp:3: error: expected constructor, destructor, or type conversion before "namespace"
0_0_2812900_3548.cpp:3: error: expected `,' or `;' before "namespace"
0_0_2812900_3548.cpp: In function `int main()':
0_0_2812900_3548.cpp:8: error: `cin' undeclared (first use this function)
0_0_2812900_3548.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2812900_3548.cpp:13: error: `cout' undeclared (first use this function)
0_0_2812900_3548.cpp:13: error: `endl' undeclared (first use this function)