2. The monitor cable is faulty;

3. The logic of the control module is chaotic.

Calculator Calculator is an electronic machine invented by modern people that can perform digital operations. Modern electronic calculator is a hand-held electronic machine that can perform mathematical operations. It has an integrated circuit chip, but its structure is much simpler than that of a computer. Can be said to be the first generation of electronic computers (computers), with weak functions, but more convenient and cheaper. It can be widely used in business transactions and is one of the necessary office supplies.