Exercises 1 and 2 -- Capitalization (2 versions) Declare a string in the data se

Question

Exercises 1 and 2 -- Capitalization (2 versions)

Declare a string in the data section such as:

.data

string: .asciiz "in a hole in the   ground there lived a hobbit"

Notice there are extra spaces in this string. Write an MIPS program that capitalizes the first letter of each word, so that after running your program the data will look like this:

.data

string: .asciiz "In A Hole In The   Ground There Lived A Hobbit"

Easy version (exercise 1): assume that the data comprises only lower case characters and spaces. There may, however, be several spaces in a row (as in "the   ground" above). Be sure to capitalize only the first letter of the words.

Medium-hard version (exercise 2): Rewrite your program so that it assumes that the data comprises only upper and lower case characters and spaces, and alters a character only if it is lower case, and follows a space or is the first character on the line.

For both versions, print the strings before and after translation by using the syscall print string service.

Explanation / Answer

This COde works for both the exercise (I have edited the code from before ).Please check once and comment if you need any help:-

.data

msg_before: .asciiz "String before conversion"

string: .asciiz "in a hole in the ground there lived a hobbit"

msg_after: .asciiz "String after conversion"

.text

.globl main

main:

la $a0,msg_before #print message

li $v0,4

syscall

la $a0,string #print string before conversion

li $v0,4

syscall

la $t0,string #loading base address of string

loop: #continuing loop character by character till end of string

lb $t1,($t0)

beqz $t1,loop_end #condition for loop end

bne $t1,' ',next_element #checking for space

addiu $t0,$t0,1 #if space character;then we are going for next character in order to #change it's case

lb $t1,($t0)

bgt $t1,'z',next_element #checking for small letter alphabet

blt $t1,'a',next_element

addiu $t1,$t1, 32 #if small letter alphabet then changing its case to upper

sb $t1,($t0)

next_element:

addiu $t0,$t0,1 #next character

j loop

loop_end:

la $a0,msg_after #print msg

li $v0,4

syscall

la $a0,string #print string after conversion

li $v0,4

syscall

li $v0,10 #exit

syscall

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