Implement a MIPS program that inputs an arbitrary length string from a user and

Question

Implement a MIPS program that inputs an arbitrary length string from a user and outputs a string that reverses the case of its characters.

For example, given as input: Hello, World! The program should output: hELLO, wORLD!

I started this, but it doesn't quite do what it needs to. Here is what I have so far..The problem is it will change hELLO, wORLD! to HelloL@WorldA

   .data
   theString:
   .space 20
   prompt: .asciiz "Enter a string of characters: "
.text
main:
   li $v0, 4
   la $a0, prompt
   syscall

   li $v0, 8
   la $a0, theString
   li $a1, 20
   syscall

   li $v0, 4
   syscall
   la $t1,theString
   for: lb $a0, 0($t1)
   beqz $a0,out             #to find out end of string
   beq $a0,10,out            #to find out end of string
   slti $t2, $a0,91        #if $a0<91 $t2=1
   beq $t2,1,small
   beq $t2,0,capital
capital:
   subu $a0, $a0, 32
   li $v0,11
   syscall
   addi $t1,$t1,1
   j for
small:
   addi $a0, $a0, 32
   li $v0,11
   syscall
   addi $t1,$t1,1
   j for
out:
   li $v0, 10
   syscall

Explanation / Answer

Here is the MIPS program that inputs a string from a user and outputs a string that reverses the case of its characters

; char.asm: character conversion: uppercase to

lowercase
.model small
.stack 100h
CR equ 13d
LF equ 10d
.data
msg1 db

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