Q1 – a.

 Write a MARIE program to calculate Fib(n), where the user inputs n. [10 marks]

·        Your program code MUST be copied to word document. You are NOT allowed to provide it as a screenshot.

·        You need to test your code with the following FIVE values for n= 0, 1, 8, 10, 23, and 25. The program should produce the results (0, 1, 21, 55, 28657, etc). You MUST to provide a screen shot for each of those five tests.

 

(b) For some values of n, your program will not produce correct results. You can check this by gradually increasing the values of n and checking for the correct outputs. What is the maximum value of n for which your program produces a correct result? Why? Please comment on this. [5 marks].

Mentions which value the program should produce correct results? And justify why? .

  

Q2: You are designing an instruction set for your computer. All the instructions are of same size (11 bits long). The size of an address field is 4 bits. You have already designed 5 2-address instructions and 45 1-address instructions. How many 0-address instructions still you can fit? Justify your answer. [7 marks]

 

·        Five 2-address instructions: means 2-address architecture that instruction consists of one opcode and 2 operands.

·        Forty-Five 1-address instructions: means 1-address architecture that instruction consists of one opcode and 1 operand.

 

Q3: Write codes to implement the expression: A= (B + C * D – E) on 3-, 2-, 1- and 0-address machines. In accordance with programming language practice, computing the expression should not change the values of its operands. [8 marks]

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