View Compilation Error

621647_0_0_27666.cpp:2: error: expected unqualified-id before '.' token
621647_0_0_27666.cpp:2: error: expected `,' or `;' before '.' token
621647_0_0_27666.cpp: In function `int main()':
621647_0_0_27666.cpp:7: error: `a' undeclared (first use this function)
621647_0_0_27666.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)