View Compilation Error

232532_0_15724.cpp:2: error: expected nested-name-specifier before "namespaces"
232532_0_15724.cpp:2: error: `namespaces' has not been declared
232532_0_15724.cpp:2: error: expected `;' before "std"
232532_0_15724.cpp:3: error: expected constructor, destructor, or type conversion before "long"
232532_0_15724.cpp:3: error: expected `,' or `;' before "long"
232532_0_15724.cpp: In function `void init()':
232532_0_15724.cpp:6: error: `A' undeclared (first use this function)
232532_0_15724.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
232532_0_15724.cpp: In function `int main()':
232532_0_15724.cpp:24: error: `A' undeclared (first use this function)