View Compilation Error

0_0_10089775_2110.cpp: In function `int main()':
0_0_10089775_2110.cpp:34: error: `A' undeclared (first use this function)
0_0_10089775_2110.cpp:34: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10089775_2110.cpp:34: error: expected `;' before "if"
0_0_10089775_2110.cpp:36: error: expected primary-expression before "else"
0_0_10089775_2110.cpp:36: error: expected `;' before "else"