Use Mars 4.5 to edit it.

Below is the stater file:

#

# substitute.s - substitute one character for another in a string

#

.data

string: .space 80

orig: .space 1

new: .space 1

sprompt: .asciiz "Enter string: "

oprompt: .asciiz "Enter character you want to replace: "

nprompt: .asciiz "Enter replacement character: "

rprompt: .asciiz "The string with replacements: "

cprompt: .asciiz "Number of replacements: "

.text

.globl main

main:

addiu $sp, $sp, 20

sw $ra, 16($sp)

# get string

la $a0,sprompt

li $v0,4

syscall

la $a0,string

li $a1,80

li $v0,8

syscall

# get original character

la $a0,oprompt

li $v0,4

syscall

li $v0,12

syscall

sb $v0,orig

# get new character

la $a0,nprompt

li $v0,4

syscall

li $v0,12

syscall

sb $v0,new

#

# Now we are ready to do the real work of substituting every instance of

# 'orig' with 'new' in 'string'.

#

# HINT: Before you start, you should initialize the following registers:

#

# a0 = address of the string

# a1 = char to look for

# a2 = char to replace with

# a3 = count of replacements (initialize to zero)

#

# Have fun!

#

#

# int i, count=0;

# for (i = 0; string[i] != 0; i++)

# {

# if (string[i] == orig)

# {

# string[i] = new;

# count++;

# }

#

# INSERT YOUR CODE HERE. MAKE SURE the number of replacements

# gets stored in $a3.

#

# This code will output the string. Before you write the code above, it will

# be exactly the string the user entered. Once you've added your code, you

# should see the string with replacements.

end:

li $v0,4

la $a0,rprompt

syscall

li $v0, 4

la $a0,string

syscall

# This code will output the count of replacements,

# which must be stored in $a3.

li $v0, 4

la $a0,cprompt

syscall

li $v0, 1

move $a0, $a3

syscall

lw $ra, 16($sp)

addiu $sp, $sp, 20

jr $ra

In this part of the assignment, you will write MIPS assembly code to replace characters in a string. This program asks the user for a string named string and two characters orig and new. It then replaces each instance of the character orig found in string with the character new. It outputs the resulting string and the number of substitutions that were made. For example, if string were "wow", orig were 'w, and new were 'b, the program would output the resulting string of "bob" and 2 as the number of substitutions. Starter File You can find the starter code at the location below. Note that this is the location of the file; do NOT try to run this as a command! In this part of the assignment, you will write MIPS assembly code to replace characters in a string. This program asks the user for a string named string and two characters orig and new. It then replaces each instance of the character orig found in string with the character new. It outputs the resulting string and the number of substitutions that were made. For example, if string were "wow", orig were 'w, and new were 'b, the program would output the resulting string of "bob" and 2 as the number of substitutions. Starter File You can find the starter code at the location below. Note that this is the location of the file; do NOT try to run this as a command