Write a MIPS program to \"guess a number\". Specification Create a variable call

Question

Write a MIPS program to "guess a number".

Specification

Create a variable called numToGuess and set it equal to your number to guess.

Pass a number entered from the keyboard to a procedure that prints one of the following messages:

If the number from the keyboard equals the number to guess, print a "good guess" message.

If the number from the keyboard is smaller than the number to guess, print a "too low" message.

If the number from the keyboard is greater than the number to guess, print a "too hi" message.

and returns 1 for a "good guess" or 0 for a "too low" or "too hi" guess.Allow no more than 5 guesses.

If the number is guessed correctly before the 5th guess, print a congratulatory message and exit the program.

If the number is not guessed correctly in five guesses, print a "you had your five guesses" message and exit the program.

Explanation / Answer

.text
main:
   add   $s0, $zero, $zero   # prepare $s0 to count the number of guesses made
   lw   $s1, allowedGuesses   # prepare $s1 with the upper bound of allowed guesses
   lw   $s2, numToGuess       # prepare $s3 with the number we should be trying to guess
  
enterNum:
   beq   $s0, $s1, tooMany   # check if there have been 5 guesses and branch if there have been
  
   la   $a0, enterNumMsg   # prepare $a0 with the enterNumMsg
   li   $v0, 4           # prepare $v0 with 4 to print enterNumMsg
   syscall
  
   li   $v0, 5           # prepare $v0 with 5 to read an int
   syscall
   move   $a0, $v0       # move the user input to $a0
  
   addi   $s0, $s0, 1       # add 1 to the number of guesses
  
   bgt   $a0, $s2, greater   # branch if guess is greater than the correct answer
   blt   $a0, $s2, less       # branch if guess is less than the correct answer

equal:
   la   $a0, goodGuess       # prepare $a0 with good guess message
   li   $a1, 1           # load $a1 with 1 to signify we are exiting
   li   $a2, 0           # load $a2 with 0 to signify we guessed the right number
   b   printAndReturnOrExit

greater:
   la   $a0, tooHigh       # prepare $a0 with too high message
   li   $a1, 0           # load $a1 with 0 to signify we are going to continue
   b   printAndReturnOrExit

less:
   la   $a0, tooLow       # prepare $a0 with too low message
   li   $a1, 0           # load $a1 with 0 to signify we are going to continue
   b   printAndReturnOrExit

tooMany:
   la   $a0, tooManyMsg       # prepare $a0 with too many message
   li   $a1, 1           # load $a1 with 1 to signify we are exiting
   li   $a2, 1           # load $a2 with 1 to signify we guessed too many times
  
printAndReturnOrExit:
   li   $v0, 4           # load $v0 with 4 to print string
   syscall
   beqz   $a1, enterNum       # if $a1 is 0 we will continue the program
  
   beqz   $a2, exit       # if $a2 is 0 we should just exit
  
   li   $v0, 1           # prepare $v0 with 1 to print an integer
   move   $a0, $s2       # prepare $a0 with the number to guess
   syscall

exit:
   li   $v0, 10           # put 10 in $v0 to prepare to exit
   syscall

.data
numToGuess:   .word   89
allowedGuesses:   .word   5
goodGuess:   .asciiz   "You were correct. "
tooHigh:   .asciiz   "You guessed too high. "
tooLow:       .asciiz   "You guessed too low. "
tooManyMsg:   .asciiz "You guessed too many times. The answer was "
enterNumMsg:   .asciiz   "Please enter a number to guess: "

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