MARIE and exponents

Discussion in 'Homework Help' started by Dino1996, Mar 30, 2013.

  1. Dino1996

    Thread Starter New Member

    Mar 30, 2013
    MARIE and exponents
    Im trying to write a program in MARIE assembly where you can put in any 2 numbers (X to the Y power) and it will find your answer. I am completely stuck and need some help. This is what I have so far:
    Code ( (Unknown Language)):
    2. [SIZE=3][FONT=Calibri]Input     [/FONT][/SIZE]
    3. [SIZE=3][FONT=Calibri]                 Store M[/FONT][/SIZE]
    4. [SIZE=3][FONT=Calibri]Input     [/FONT][/SIZE]
    5. [SIZE=3][FONT=Calibri]                 Store N[/FONT][/SIZE]
    6. [SIZE=3][FONT=Calibri]         Load M     /load 1st value as counter[/FONT][/SIZE]
    7. [SIZE=3][FONT=Calibri]         Store Ctr1  /Store the counter[/FONT][/SIZE]
    8. [SIZE=3][FONT=Calibri]Loop,    Load Sum   /Load sum[/FONT][/SIZE]
    9. [SIZE=3][FONT=Calibri]         Add M      /Add M to Sum[/FONT][/SIZE]
    10. [SIZE=3][FONT=Calibri]         Store Sum  /Store result in Sum[/FONT][/SIZE]
    11. [SIZE=3][FONT=Calibri]         Load Ctr1   /initialize counter[/FONT][/SIZE]
    12. [SIZE=3][FONT=Calibri]         Subt One   /Decrement counter[/FONT][/SIZE]
    13. [SIZE=3][FONT=Calibri]         Store Ctr1  /Store counter[/FONT][/SIZE]
    14. [SIZE=3][FONT=Calibri]         SkipCond 400 /discontinue loop if Ctr1=0[/FONT][/SIZE]
    15. [SIZE=3][FONT=Calibri]         Jump Loop   /if AC not 0, continue loop[/FONT][/SIZE]
    16. [SIZE=3][FONT=Calibri]Endloop, Load N      /loading to counter[/FONT][/SIZE]
    17. [SIZE=3][FONT=Calibri]                 Store Ctr2  [/FONT][/SIZE]
    18. [SIZE=3][FONT=Calibri]                 Jump B      /off to B[/FONT][/SIZE]
    19. [SIZE=3][FONT=Calibri]C,            Load Sum[/FONT][/SIZE]
    20. [SIZE=3][FONT=Calibri]                 Output      /Print product[/FONT][/SIZE]
    21. [SIZE=3][FONT=Calibri]         Halt        /Sum = MeN [/FONT][/SIZE]
    22. [SIZE=3][FONT=Calibri]B,            Load Sum    / [/FONT][/SIZE]
    23. [SIZE=3][FONT=Calibri]                 Store P     /[/FONT][/SIZE]
    24. [SIZE=3][FONT=Calibri]                 Jump E       /off to E[/FONT][/SIZE]
    25. [SIZE=3][FONT=Calibri]Loop1,  Load P      / load P[/FONT][/SIZE]
    26. [SIZE=3][FONT=Calibri]                 Add Sum     /add sum[/FONT][/SIZE]
    27. [SIZE=3][FONT=Calibri]                 Store Sum    / save sum                [/FONT][/SIZE]
    28. [SIZE=3][FONT=Calibri]                 Load Ctr1   /load counter 1[/FONT][/SIZE]
    29. [SIZE=3][FONT=Calibri]                 Subt One    /subtract 1 from counter[/FONT][/SIZE]
    30. [SIZE=3][FONT=Calibri]                 Store Ctr1  /store value of counter[/FONT][/SIZE]
    31. [SIZE=3][FONT=Calibri]                 SkipCond 400 /skip next line if current value of ctr1 = 0[/FONT][/SIZE]
    32. [SIZE=3][FONT=Calibri]                 Jump Loop1       /off to loop1[/FONT][/SIZE]
    33. [SIZE=3][FONT=Calibri]EndLoop1, Load Ctr2       /load counter2 [/FONT][/SIZE]
    34. [SIZE=3][FONT=Calibri]                 Subt One            /subtract 1[/FONT][/SIZE]
    35. [SIZE=3][FONT=Calibri]                 Store Ctr2           /store counter 2[/FONT][/SIZE]
    36. [SIZE=3][FONT=Calibri]                 Load M            /load M to get ready to use it as the counter again[/FONT][/SIZE]
    37. [SIZE=3][FONT=Calibri]F,            Store Ctr1    /saved value for counter 1[/FONT][/SIZE]
    38. [SIZE=3][FONT=Calibri]                 Load Ctr2            / load counter 2[/FONT][/SIZE]
    39. [SIZE=3][FONT=Calibri]                 SkipCond 400   /checking for valve 0[/FONT][/SIZE]
    40. [SIZE=3][FONT=Calibri]                 Jump Loop1       /if not 0 off to loop1[/FONT][/SIZE]
    41. [SIZE=3][FONT=Calibri]                 Jump C                                /now we are done[/FONT][/SIZE]
    42. [SIZE=3][FONT=Calibri]D,            Load M[/FONT][/SIZE]
    43. [SIZE=3][FONT=Calibri]                 Subt One[/FONT][/SIZE]
    44. [SIZE=3][FONT=Calibri]                 Store Ctr1[/FONT][/SIZE]
    45. [SIZE=3][FONT=Calibri]                 Jump B[/FONT][/SIZE]
    46. [SIZE=3][FONT=Calibri]E,            Load M       /Starting new counters[/FONT][/SIZE]
    47. [SIZE=3][FONT=Calibri]                 Store Ctr2   /Counter 2 [/FONT][/SIZE]
    48. [SIZE=3][FONT=Calibri]                 Load M       /Loading M for counter 1[/FONT][/SIZE]
    49. [SIZE=3][FONT=Calibri]                 Subt One     /I have the first value for P so counter is starting now[/FONT][/SIZE]
    50. [SIZE=3][FONT=Calibri]                 Jump F       /off to F[/FONT][/SIZE]
    52. [SIZE=3][FONT=Calibri]  Ctr1,  Dec 0 /Used for first couter to find [/FONT][/SIZE]
    53. [SIZE=3][FONT=Calibri]  Ctr2,  Dec 0 /going to use the N input as counter 2[/FONT][/SIZE]
    54. [SIZE=3][FONT=Calibri]  M,     Dec 0 /initial value of M[/FONT][/SIZE]
    55. [SIZE=3][FONT=Calibri]  P,          Dec 0 /init value of P[/FONT][/SIZE]
    56. [SIZE=3][FONT=Calibri]  Sum,   Dec 0 /initial value of Sum[/FONT][/SIZE]
    57. [SIZE=3][FONT=Calibri]  One,   Dec 1 /constant value 1[/FONT][/SIZE]
    58. [SIZE=3][FONT=Calibri]  Two,   Dec 2 /constant Value 2[/FONT][/SIZE]
    59. [SIZE=3][FONT=Calibri]  N,         Dec 0 /Initial value of M
    60. [SIZE=3][/SIZE][/FONT][/SIZE]

    Last edited by a moderator: Mar 31, 2013
  2. WBahn


    Mar 31, 2012
    You don't really expect someone to walk through your code line by line tryng to find where it is going wrong when you don't give any indication of what it is supposed to be doing or what it is actually doing or what steps you have tried to debug it, do you?

    At the very least, provide a flow chart or a high-level language equivalent of your algorithm.
  3. Dino1996

    Thread Starter New Member

    Mar 30, 2013
    Sorry, you are correct. My issue is I need find a way to find the sum of x to the power of y using only addition I thought I had it but I just cant seem to figure out a way
  4. WBahn


    Mar 31, 2012
    So describe the method you are trying to use.
  5. Dino1996

    Thread Starter New Member

    Mar 30, 2013
    What I was trying to do was use addition, two counters and some loops but my program only worked for 5 to the 4th power.
  6. WBahn


    Mar 31, 2012
    Again, we are NOT mind readers. Tell us what your algorithm is without making use reverse engineer it from your code, what may well have bugs in it.
  7. takao21203

    AAC Fanatic!

    Apr 28, 2012
    And a decent Spaghetti meal.

    Javascript can do such things.
    Or do you want to learn assembler?
  8. Dino1996

    Thread Starter New Member

    Mar 30, 2013
    I need to learn it for a class. I figured it out, if you have x to the power of y, you first loop x plus itself x times make that new number, z, and then add that to itself x times. Run that loop y-1 times. I just needed to take care of 0 and 1 separately and all was good!:)
  9. absf

    Senior Member

    Dec 29, 2010
    I dont quite get your description on how your program works...

    Now let us use "3 to the power 4" ie 3x3x3x3=81 as an example. Can you walk me through your program and show us how it get 81 as the answer?

  10. WBahn


    Mar 31, 2012
    At best, you are describing an algorithm that might work if x and y are both positive integers. Your initial post says that the user can enter ANY to numbers.

    What if they enter 3.2 and -4.5?

    Once again, we are NOT mind readers. Would you PLEASE clearly state what you are trying to do, including any constraints on the input values, and the algorithm you are trying to implement?
  11. Dino1996

    Thread Starter New Member

    Mar 30, 2013
    Sorry, you are correct, any positive whole number. Im new at this
  12. Dino1996

    Thread Starter New Member

    Mar 30, 2013
    sure 3 to the power of 4: 3+3+3 = 9 , (you do this 3 times, 1 - 4 always subtract 1 from the exponent) 9+9+9 = 27, 27+27+27 = 81 I also had to put in filters for the ones and zeroes.
  13. WBahn


    Mar 31, 2012
    While your algorithm is valid, consider how many operations would need to be performed in order to calculate 45000^2, which is not even large enough to overflow a 32-bit signed integer.

    You might want to consider writing a routine that can multiply x and y using only addition and then use that routine when performing your exponentiation.

    Another approach which can squeeze even more out of the time, is to recognize that


    is trivial when y is an integer power of two and that any binary number is the weighted addition of integer powers of two.