Compilare: main.cpp: In member function 'BigInt& BigInt::operator+=(BigInt)': main.cpp:21:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (int i = 0; i < termen.digits.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'BigInt& BigInt::operator-=(BigInt)': main.cpp:35:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i = 0; i < termen.digits.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/c++/12.2.1/string:53, from /usr/include/c++/12.2.1/bits/locale_classes.h:40, from /usr/include/c++/12.2.1/bits/ios_base.h:41, from /usr/include/c++/12.2.1/ios:42, from /usr/include/c++/12.2.1/istream:38, from /usr/include/c++/12.2.1/sstream:38, from /usr/include/c++/12.2.1/complex:45, from /usr/include/c++/12.2.1/ccomplex:39, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:54, from main.cpp:1: In member function 'constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]', inlined from 'void prec_fibo()' at main.cpp:86:44: /usr/include/c++/12.2.1/bits/basic_string.h:1064:16: warning: array subscript 2 is outside array bounds of 'std::string [2]' {aka 'std::__cxx11::basic_string<char> [2]'} [-Warray-bounds] 1064 | { return _M_string_length; } | ^~~~~~~~~~~~~~~~ main.cpp: In function 'void prec_fibo()': main.cpp:8:8: note: at offset 64 into object 's' of size 64 8 | string s[2]; | ^