How do I store more than one user entered integer without using an array in MIPS?

Question

My question is; How do I store more than one user entered input into a variable without creating an array? When I run the code as I have posted here I get the error "store address not aligned on word boundary." Variable one is store1, variable two is store2. I want to store both separately entered integers into store1, and store2 respectively.

.data

store1: .byte 4                     #Stores data entered by user
store2: .byte 4                     # "                        "
msg: .asciiz "Enter your first decimal number: "
msg2: .asciiz "Enter your second decimal number: "
.text

main:

la $a0, msg #Displays msg
li $v0, 4
syscall

li $v0, 5   #Prompts user to enter an integer
syscall

la $t0, store1  #Loads user input into store1
sw $v0, store1  #Stores user input into store1

la $a0, msg2    #Displays msg2
li $v0, 4
syscall

li $v0, 5   #Prompts user to enter another integer
syscall

la $t1, store2    #My error occurs here 
sw $v0, store2    #If I delete these 3 lines the code compiles with no errors
syscall

li $v0, 10  #Cleanly exits the program 
syscall

You only allocated a byte. If you intend to store bytes, use sb not sw. Conversely, if you want words, use .int or whatever is equivalent in mars. — Jester
– Jester, Commented Nov 21, 2019 at 19:35
Understood. Using sb corrected the issue. Along with also changing .byte 4 to .int 0 Thank you for your help. — FB51
– FB51, Commented Nov 21, 2019 at 21:43

Peter Cordes · Accepted Answer · 2019-11-21 20:59:13Z

1

.byte 4 is one byte with the value 4, not four bytes (a word). So they can't both be word-aligned. You can see this by using the debugger to look at memory contents.

Perhaps you were looking for .skip 4 if MARS allows that GAS pseudo-instruction.

Or like Jester said just use .int 0 or .word 0

answered Nov 21, 2019 at 20:59

Peter Cordes

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