View Compilation Error

0_0_8193047_32326.cpp:78: error: field `a' has incomplete type
0_0_8193047_32326.cpp:92: error: expected `}' at end of input
0_0_8193047_32326.cpp: In member function `int bign::main()':
0_0_8193047_32326.cpp:84: error: `a' undeclared (first use this function)
0_0_8193047_32326.cpp:84: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8193047_32326.cpp: At global scope:
0_0_8193047_32326.cpp:92: error: expected unqualified-id at end of input
0_0_8193047_32326.cpp:92: error: expected `,' or `;' at end of input