View Compilation Error

0_0_1678900_14510.cpp:2: error: expected nested-name-specifier before "namespacestd"
0_0_1678900_14510.cpp:2: error: `namespacestd' has not been declared
0_0_1678900_14510.cpp: In function `int main()':
0_0_1678900_14510.cpp:6: error: `cin' undeclared (first use this function)
0_0_1678900_14510.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1678900_14510.cpp:7: error: `cout' undeclared (first use this function)
0_0_1678900_14510.cpp:7: error: `endl' undeclared (first use this function)