Question

Write a MIPS assembly language program that adds the following two integers and displays the sum and the difference. In the .data section, define two variables num1 and num2 both words. Initialize num1 to 50274 10and num2 to CB7 16 (use 0xCB7 to initialize). Your main procedure should load the values of num1 and num2 into two temporary registers, and display them on the console window. Then add the values together, and use the print_int system call function to display the sum on the console window.
Also compute the difference of two numbers and display it on the console window. To print an integer on the console window, you must put the integer to be printed in the $a0 register, and the value 1 in the $v0 register. Then perform a syscall operation. This makes a call to the PCSPIM operating system which will display the integer in $a0 on the console window. Name your source code file assignment2.s.

Your output format should look as follows:

num1 is: XXX
num2 is: XXX
num1+num2 = XXX
num1-num2 = XXX

where XXX is the correct number for each.

Answer 1

Answer:

The Assembly code is given below with appropriate comments

Explanation:

#Data Section

.data

    #Display the Labels

    number1: .asciiz "num1 is : "

    number2: .asciiz "\nnum2 is : "

    addition: .asciiz "\nnum1 + num2 = "

    subtraction: .asciiz "\nnum1 - num2 = "

   

    #variable declarations

    num1: .word 50274

    num2: .word 0xCB7

.text

#Main method

main :

    # print the label number 1

    li $v0,4

    la $a0,number1

    syscall

   

    # print the value

    li $v0,1

    la $a0,num1

    lw $a0,($a0)

    syscall

   

    # print the label number2

    li $v0,4

    la $a0,number2

    syscall

   

    # print the value

    li $v0,1

    la $a0,num2

    lw $a0,($a0)

    syscall

   

    #Compute addition of two numbers

    la $t0,num2

    lw $t0,($t0)

    la $t1,num1

    lw $t1,($t1)

    add $t0,$t1,$t0

   

    # print the label

    li $v0,4

    la $a0,addition

    syscall

   

    # print the value

    li $v0,1

    addi $a0,$t0,0

    syscall

   

    #Compute subtraction of two numbers

    la $t0,num2

    lw $t0,($t0)

    la $t1,num1

    lw $t1,($t1)

    sub $t0,$t1,$t0

   

    # print the label3

    li $v0,4

    la $a0,subtraction

    syscall

   

    # print the value

    li $v0,1

    addi $a0,$t0,0

    syscall