Section 1: Using the MARS or SPIM simulator develop a program that will evaluate

Question

Section 1: Using the MARS or SPIM simulator develop a program that will evaluate the following expression 3 n n* (n 1) 15 where n is stored in a data location and is set to 15. Your program should use the system calls to print the result and to exit the program. Section 2: Using the MARS or SPIM simulator develop a program that will implement the following conditional statement. If n is even) n /2 else n 3 n 1; In this case, n is to be input by the user (assume they input a non-negative value), the conditional is performed, and the resulting n is to be output. Again, use the system calls for input, output, and exiting the program Hint: There is a remainder pseudoinstruction for the MIPS architecture that you can use to determine if the value is even or odd or you can look at bit o to determine if the value is even or odd.

Explanation / Answer

Answer

section .text
   global _start
_start:
   mov bx, data
   mov ds, bx

   lea si, msg
   call print

   mov ah, 01h
   int 21h

WHILE:
   sar al, 01
   jc ODD

   lea si, msgE
   call print
   mov bl, 2
   div al, bl
   jump loop
  
ODD:
   lea si, msgO
   call print
   mov bl, 3
   mul al, bl
   mov bl, 1
   add al, bl

loop:
   cmp al, 00
   jg WHILE

terminate:
   mov ah, 4ch
   int 21h

   print proc
   mov dx, si
   mov ah, 09h
   int 21h
   ret
   print endp

section .data
msg db 10, 13, 'Enter a number = $'
msgE db 10, 13, 'Number is even $'
msgO db 10, 13, 'Number is odd $'

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