Write down a not so bad cardiac simulator

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Reference no: EM1331503

Write a not so bad CARDIAC simulator (in C++) that tells the user how to execute an instruction typed as a 3 digit number by the user.

The user should be prompted to type in a 3 digit number, and then the program should print to the screen whatever the CARDIAC Instruction Decoder box would show had that been the instruction.

* Use a pleasant switch statement for decoding the instructions based on op-codes, rather than nested if, consecutive if, or if/elseif monstrosity.

* Use a loop to allow users to provide as many instructions as they would like. Inform the users what they could type to exit the program (e.g., entering "1234" as an instruction).

* Keep track of the accumulator for the user. Use an accumulator variable for this purpose.

Assume that the accumulator contains 0 when the program starts. If the instruction modifies the accumulator (i.e., instructions 1xx, 2xx, 4xx, and 7xx), prompt the user for whatever data is necessary to execute the instruction, and execute
it ensuring that the accumulator is modified appropriately. Do not forget that the accumulator is only 3 digits long.

* Instruction 6xx should replace the word "accumulator" with the current value of the accumulator in its output to the user.

An example run of program might look like this.

Enter a 3 digit CARDIAC instruction (negative to exit): 123
Replace accumulator with cell 23
Enter the data in cell 23: 431
Enter a 3 digit CARDIAC instruction (negative to exit): 412
Shift accumulator left 1 digits, then right 2 digits
The accumulator now contains 3
Enter a 3 digit CARDIAC instruction (negative to exit): 375
Move bug to cell 75
Enter a 3 digit CARDIAC instruction (negative to exit): 250
Add the contents of cell 50 to the accumulator
Enter the data in cell 50: 99
Enter a 3 digit CARDIAC instruction (negative to exit): 348
Enter a 3 digit CARDIAC instruction (negative to exit): 630
Copy accumulator to cell 30
The accumulator now contains 96
Enter a 3 digit CARDIAC instruction (negative to exit): -1

Operation codes are as follows:

Code Abbreviation Meaning
0 INP Copy input to memory.
1 CLA Copy memory to accumulator.
2 ADD Add memory to accumulator.
3 TAC Move bug if accumulator < 0.
4 SFT Shift accumulator left then right.
5 OUT Copy memory to output.
6 STO Copy accumulator to memory.
7 SUB Subtract memory from accumulator.
8 JMP Backup bug to 99 then move bug.
9 HRS move bug and stop computing.

Reference no: EM1331503

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