Compilare: user.cpp: In member function ‘bigint bigint::operator+(bigint)’: user.cpp:36: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘bigint bigint::operator*(bigint)’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:115: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:116: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:119: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result