Write a complete MIPS program to toggle the case of all alphabetic characters in
ID: 3882717 • Letter: W
Question
Write a complete MIPS program to toggle the case of all alphabetic characters in a C-string held in RAM in your program. Declare the string with a reasonable value (a 5 or 6 word sentence with spaces and punctuation) and print it before and after toggling the case of all alphabetic characters in the string. Do not add notes to the top of the program, but you may comment individual lines. The upper-case characters are 32 less than their corresponding lower-case characters. (less than 40 lines of code)
Explanation / Answer
This should give an idea:
.text
.globl __start
main:
la $t1, str
nextCh: lb $t2, ($t1)
beqz $t2, strEnd
addi $t4, $zero, 0x61
sub $t3, $t2, $t4
bgez $t3, l1
add $t2, $t2, 32
sb $t2, ($t1)
l1: add $t1, $t1, 1
j nextCh
strEnd: la $a0, ans
li $v0, 4
syscall
la $a0, str
li $v0,4
syscall
la $a0, endl
li $v0, 4
syscall
li $v0, 10
syscall
.data
str: .asciiz "ABCdEfgH"
ans: .asciiz "lowercase string ="
endl: .asciiz " "
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