Arithmetic and logic units (ALU) performs basic arithmetic operations like addition ,subtraction ,division ,multiplication etc and basic logical operations like OR,AND,XOR,NOT,NAND,NOR etc . Control unit supervises all the functions of different parts of computers by generating control signals .
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control unit is intergrated circuitry area in processor.it is not separatly situated .i mean you cant see it.it is responsible to control the flow of data and address in your any cpu