View Compilation Error

0_0_10665654_28830.cpp: In member function `void BigInt::sub(const int*, const int*, int*) const':
0_0_10665654_28830.cpp:196: error: `W' undeclared (first use this function)
0_0_10665654_28830.cpp:196: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10665654_28830.cpp:196: error: expected `;' at end of input
0_0_10665654_28830.cpp:196: error: expected `}' at end of input
0_0_10665654_28830.cpp:196: error: expected `}' at end of input