View Compilation Error

D:\HDOJ\temp\2_14855_1062252_17522.cpp:2: error: expected constructor, destructor, or type conversion before '=' token
D:\HDOJ\temp\2_14855_1062252_17522.cpp:2: error: expected `,' or `;' before '=' token
D:\HDOJ\temp\2_14855_1062252_17522.cpp: In function `int main()':
D:\HDOJ\temp\2_14855_1062252_17522.cpp:10: error: `a' undeclared (first use this function)
D:\HDOJ\temp\2_14855_1062252_17522.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)