Compilare: user.cpp: In function ‘int main()’: user.cpp:53:19: warning: unused variable ‘j’ [-Wunused-variable] int mn=0, j; f>>x>>y; ^ user.cpp: In member function ‘char citire::next()’: user.cpp:30:103: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (pointer_==buffer_+buffer_size_) {pointer_ = buffer_;fread(buffer_, 1, buffer_size_, file_);} ^