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Explain how a stack organized computer executes instructions? What is Stack?

A stack organized computer is a type of computer architecture in which the memory is organized as a stack. In this architecture, the stack is used to store data, operands, and return addresses. The stack pointer (SP) is a register that points to the top of the stack.

When an instruction is executed, the operands are pushed onto the stack, and the result is also stored on the stack. The stack is also used to store return addresses when a subroutine is called.

The execution of instructions in a stack organized computer can be described as follows:

  1. Fetch the instruction from memory.
  2. Decode the instruction to determine the operation to be performed.
  3. Push the operands onto the stack.
  4. Perform the operation on the operands.
  5. Store the result on the stack.
  6. Update the stack pointer.
  7. Repeat steps 1-6 for the next instruction.