ALU comprises numbers of accumulators or resisters on its constructions. All the data from the memory directs by control unite gets loaded in ALU. It is one of the very important parts of the CPU. The primary task of the ALU is to perform various arithmetic and logical operations of the program.

Output unit is the unit through which all the results are given out by output devices.

Any two functions of control unit are as follows:

  • It performs the data processing operations with aid of program prepared by the users and send control signals to various parts of the computer system.
  • It gives commands to transfer data from the input device to the memory to arithmetic logic unit.

Control unit is the unit which controls the entire system of computer. That unit directs all operations inside the computer. It will make a proper sequence to direct the data and instructions from the memory to ALU for precise operations performed by ALU.