Borderou de evaluare (job #403185)

Compilare: user.cpp: In copy constructor 'BigInt::BigInt(const BigInt&)': user.cpp:72:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In member function 'BigInt& BigInt::operator+=(BigInt)': user.cpp:140:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:151:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In member function 'BigInt& BigInt::operator*=(BigInt)': user.cpp:230:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:232:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:234:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:244:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:246:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In member function 'bool BigInt::operator==(BigInt)': user.cpp:336:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In member function 'BigInt& BigInt::pow(BigInt, BigInt)': user.cpp:414:16: warning: reference to local variable 'ret' returned [enabled by default] user.cpp: In member function 'bool BigInt::operator>=(BigInt)': user.cpp:436:39: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]