Question 1. Using MARS write a MIPS assembly language program to prompt for two

Question

Question 1.

Using MARS write a MIPS assembly language program to prompt for two integers A and B, store them in memory locations labelled A and B respectively, then calculate the sum between them (i.e. A + B) and store the sum into a memory location labelled S. After that print out the result (i.e. integer S) after printing the string "The sum of A and B (A + B) is ". Then assemble and run the program with MARS to show and capture the input/output. Follows instructions for programming assignments in the syllabus.

Explanation / Answer

#Please see the below code

.data
A:          .word       # Integer A
B:          .word       # Integer B
S:          .word       #Integer S use to store the sum of A and B
Prompt1:    .asciiz "Please enter first number A: "
Prompt2:    .asciiz "Please enter second number B: "
Result:     .asciiz "The sum of A and B in S is : "

.text
main:
    #Prompt for integers A
    li $v0, 4          # Load instruction for printing the string
    la $a0, Prompt1    # Load Prompt1 into $a0
    syscall

    #Read first integer
    li $v0, 5      # Read first integer A
    la $t0, A    
    syscall

    #Store first integer A into the memory
    move    $t0, $v0  
    sw $t0, A     
  

    ##Prompt for integers B
    li $v0, 4          # Load instruction for printing the string
    la $a0, Prompt2    # Load prompt2 into $a0
    syscall

    #Read second integer
    li $v0, 5      # Read second integer
    la $t1, B      # $t0 = A
    syscall

    #Store second integer into memory
    move    $t1, $v0    # Move contents in $v0 to $t0
    sw $t1, B      # A = value at $t0
  

    #Add the two variables A and B and store it in S
    la $t2, S      # $t2 = S
    add     $t2, $t0, $t1   # $t2 = $t0 + $t1
    sw $t2, S      # S = value at $t2

    #Display the Result prompt
    la $a0, Result # Loads Output label to be printed
    li $v0, 4      # Sysycall to print string
    syscall

    #Display the sum
    lw $a0, S      # $a0 = value at S
    li $v0, 1      # Syscall to print integer
    syscall

    #Exit the program
    li $v0, 10     # Load exit code to $v0
    syscall

OUTPUT:
Please enter first number A: 3
Please enter second number B: 4
The sum of A and B in S is : 7

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