project/mips1.asm

   1     .data
   2
   3 Welcome1:
   4     .ascii  "\n Hello! you are about to play the mastermind"
   5     .ascii  " guessing and logic game,Bulls & Cows!\n"
   6     .ascii  "The Computer will generate a secret number made of 4 unique"
   7     .ascii  " integer numbers. You have to guess the number!\n"
   8     .ascii  "Using the number of Bulls and Cows you get to find out what"
   9     .asciiz " the secret number is!\n"
  10
  11 Welcome2:
  12     .ascii  "\nEvery digit you enter that is both correct and in the right"
  13     .ascii  " location is a BULL. When you get 4 BULLS, YOU WIN!\n\n"
  14     .ascii  "Every digit you enter that is correct, but not in the right"
  15     .asciiz " location is a COW!\n"
  16
  17 confirm:
  18     .ascii  "\n Select \n"
  19     .ascii  "YES - if you are ready to guess\n"
  20     .ascii  "NO - to see the rules again\n"
  21     .asciiz "Cancel - to exit the Game\n"
  22
  23 msg_asknum:
  24     .asciiz "\nEnter your game choice\n"
  25
  26     .text
  27
  28 main:
  29
  30     # show intro and rules
  31 main_welcome:
  32     la      $a0,Welcome1
  33     li      $a1,1
  34     li      $v0,55
  35     syscall
  36
  37     la      $a0,Welcome2
  38     li      $v0,55
  39     syscall
  40
  41     # ask user to select an action (i.e. enter data, reread rules, exit program)
  42 main_confirm:
  43     la      $a0,confirm
  44     li      $v0,50
  45     syscall
  46
  47     # the return is in a0: 0=yes, 1=no, 2=cancel
  48     beq     $a0,0,main_asknum
  49     beq     $a0,2,main_exit
  50     b       main_welcome
  51
  52     # ask user for the next game input
  53     # NOTE: this is a prompt for an integer number
  54 main_asknum:
  55     li      $v0,51
  56     la      $a0,msg_asknum
  57     syscall
  58
  59     beq     $a1,-1,main_asknum      # syntax error
  60     beq     $a1,-2,main_confirm     # cancel
  61     beq     $a1,-3,main_asknum      # ok, but no data
  62
  63     jal     do_something            # do something with the number in a0 ...
  64
  65     j       main_asknum
  66
  67 main_exit:
  68     li      $v0,10
  69     syscall
  70
  71 # do_something -- process user's input
  72 #
  73 # arguments:
  74 #   a0 -- number the user entered
  75 do_something:
  76     jr      $ra                     # return