Compilare: user.cpp: In function ‘int main()’: user.cpp:147:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < v.size(); i++) ^ user.cpp: In member function ‘char InParsare::read_character()’: user.cpp:34:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, CHARMAX, fin); ^