#Basic computer notes in hindi software

They also require less memory space than two or three-address instructions.

They allow for a wide range of addressing modes, making them more flexible than zero-address instructions.

They are simple and can be executed quickly since they do not require any operand fetching or addressing.

Three Address Instruction Expression: X = (A+B)*(C+D)Īdvantages of Zero-Address, One-Address, Two-Address and Three-Address Instructions Zero-address instructions These instructions make the creation of the program much easier but it does not mean that program will run much faster because now instructions only contain more information but each micro-operation (changing the content of the register, loading address in the address bus etc.) will be performed in one cycle only. Programs created are much short in size but number of bits per instruction increases. This has three address fields to specify a register or a memory location. For example, a three-address instruction might multiply the contents of two registers together and add the contents of a third register, storing the result in a fourth register.

The instruction operates on the contents of all three operands, and the result may be stored in the same or a different location. These instructions specify three operands or addresses, which may be memory locations or registers. Here destination address can also contain an operand. Implied means that the CPU already knows that one operand is in the accumulator so there is no need to specify it. One operand is in the accumulator and the other is in the register or memory location.

This uses an implied ACCUMULATOR register for data manipulation. For example, a one-address instruction might load the contents of a memory location into a register. The instruction operates on the contents of that operand, and the result may be stored in the same or a different location. These instructions specify one operand or address, which typically refers to a memory location or register. To evaluate an expression first it is converted to reverse Polish Notation i.e.

#Basic computer notes in hindi software

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