Question

7. Ask the user to type in a number and compare this number with 8. The user could try twice.

If the first user input was 8 then print out “Correct!” and terminate the program, otherwise ask user to type in a number for the second time. If the second input was 8 then print out “Correct”, otherwise print “Game over!”

Finish the assembly code segment for the above requirement.

.data

message: .asciiz "Please enter a random number:"

right_str: .asciiz "Correct!\n"

wrong_str: .asciiz "Game over! \n"

.text

            li $t0,8 # true answer

            li $t1,0 #counter, two chances           

loopcheck:  

            la $a0, message # ask user type in

            li $v0, 4

            syscall

            li $v0, 5

            syscall

            move $s1, $v0 # s1 is the user input

            …. # your answer here

           …. # your answer here

printGameOver:

            la $a0, wrong_str

            li $v0, 4

            syscall

            j done

printright:

            la $a0, right_str

            li $v0, 4

            syscall           

done: #exit

li $v0, 10

syscall

Answer 1

Note: Register used and branch names are arbitrary. These can be changed according to the user's choice. Please refer to code snippets for a better understanding of comments and indentations.

IDE Used: MARS

Program Code

.data

message: .asciiz "Please enter a random number:"

right_str: .asciiz "Correct!\n"

wrong_str: .asciiz "Game over! \n"

.text

   li $t0,8 # true answer

   li $t1,0 #counter, two chances   

   # two iteration for the loop
   loopcheck:
  
   # check if number of chances are equal to 2
   beq $t1, 2, printGameOver
  
   # prompt number from the user
   li $v0, 4
   la $a0, message
   syscall

   # get integer value
   li $v0, 5
   syscall

   move $s1, $v0 # s1 is the user input
  
   #answer code starts here
  
   # check if number is equal to 8
   # if correct go to printright branch
   beq $s1, 8, printright
  
   # increment loops
   addi $t1, $t1, 1
  
   # jump to loopcheck
   j loopcheck

   # branch for Gameover
   printGameOver:
       # print the wrong gameover statement
   la $a0, wrong_str
   li $v0, 4
   syscall

       # jump to done label i.e end of program
   j done

   # print right branch
   printright:
       # print the right statement
   la $a0, right_str
   li $v0, 4
   syscall   

   done:
       # end of program
       li $v0, 10
       syscall

Code Snippets

Sample Output Runs