Compilare: user.cpp: In member function 'BigInt& BigInt::operator=(const BigInt&)': user.cpp:13: warning: comparison between signed and unsigned integer expressions user.cpp: In member function 'BigInt& BigInt::operator=(long long int)': user.cpp:24: warning: no return statement in function returning non-void user.cpp: In member function 'BigInt& BigInt::operator+=(const BigInt&)': user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp:34: warning: unused variable 'i' user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp:44: warning: unused variable 'x' user.cpp: In member function 'BigInt& BigInt::operator+=(long long int)': user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:86: warning: unused variable 'k' user.cpp: In member function 'BigInt& BigInt::operator=(long long int)': user.cpp:24: warning: control reaches end of non-void function user.cpp: In member function 'BigInt& BigInt::operator+=(long long int)': user.cpp:70: warning: control reaches end of non-void function user.cpp: In member function 'BigInt& BigInt::operator+=(const BigInt&)': user.cpp:56: warning: control reaches end of non-void function