CODEWITHSUNDEEP
arraysmips
pdhimal1
pdhimal1

Reputation: 229

MIPS program to get two integers from the user, save it to an array, and print it

I am trying to write a MIPS assembly program to get two integers from the user, save it to the memory in an array and print it. This is what i have so far. My program prints some big number that I didn't put in. I am very new to this game. Somebody help please!

Here's my code:

.text
.globl main

    main:
        li $v0, 4       
        la $a0, prompt  
        syscall

        li $t0, 0      #count for the loop to get two integers
    getnum:
        li $v0, 5   #read integer
        syscall
        sw $v0, num($s0)    #save the integer from user input into num and $s0 has address for num, I'm not sure if i did this right
        addi $s0, $s0, 4    # increment $s0 by 4 to save another integer
        addi $t0, $t0, 1    #increment the counter
        ble $t0, 1, getnum       #if counter $t0, is less then or equal to 1, it will go through the loop again

    printnum:   
        la $a0, num($s0)        #load address of num to print
        li $v0, 1           #print int
        syscall 
        addi $s0, $s0, 4    
        addi $t1, $t1, 1
        ble $t1, 1, printnum        #does it twice

        li $v0, 10  
        syscall
.data 

    num:
         .word 0, 0  # i want to store my two numbers here
    prompt: 
        .asciiz "Enter 2 positive integers: "

Upvotes: 1

Views: 3661

Answers (1)

Konrad Lindenbach
Konrad Lindenbach

Reputation: 4961

Your problems are two fold.

First, you are loading the address of the integer instead of the actual integer. To fix this change la to lw.

Secondly, because you increment $s0 twice in the getnum loop and immediately use it in the printnum loop it is too far ahead, you will need to add move $s0, $zero to solve this problem.

In addition, your code seems to rely on the fact that $s0 starts the program with a value of 0, which isn't perhaps a great assumption to make. It would be better to explicitly set it to zero.

Upvotes: 2

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