Compilare: user.cpp: In function ‘void operator+=(big&, big)’: user.cpp:122:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a.d.size() == i) a.d.push_back(0); ^ user.cpp: In function ‘big operator+(big, long long int)’: user.cpp:139:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘big operator+=(big&, long long int)’: user.cpp:143:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void operator*=(big&, big)’: user.cpp:161:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i + j == c.d.size()) c.d.push_back(0); ^ user.cpp: In function ‘int main()’: user.cpp:203:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("puteri2.out","w",stdout); ^