4 input MIPS Calculator - mips

Question

Im new to MIPS and my friend practice program is a calculator, instead of allowing users to have 2 inputs(eg. 1 + 2 or 1 * 4) how do allow them to have 4 inputs (eg. 1 + 3 + 3 + 2 or 1 * 4 * 5 * 2). The code below is a working 2 input calculator how do I make it to 4?
#data
.data
prompt1: .asciiz "Type out your first number: "
prompt2: .asciiz "Type out your second number: "
prompt3: .asciiz "Type out your third number: "
prompt4: .asciiz "Type out your fourth number: "
menu: .asciiz "Now choose which of the operation you want do: 1 for add, 2 for subtract , 3 for multiply: "
resultText: .asciiz "Your final result is: "
.text
.globl main
main:
#The following block of code is to pre-load the integer values representing the various instructions into registers for storage
li $t3, 1 #This is to load the immediate value of 1 into the temporary register $t3
li $t4, 2 #This is to load the immediate value of 2 into the temporary register $t4
li $t5, 3 #This is to load the immediate value of 3 into the temporary register $t5
li $t6, 4 #This is to load the immediate value of 4 into the temporary register $t6
li $t7, 5 #This is to load the immediate value of 5 into the temporary register $t7
#asking the user to provide the first number
li $v0, 4 #command for printing a string
la $a0, prompt1 #loading the string to print into the argument to enable printing
syscall #executing the command
#the next block of code is for reading the first number provided by the user
li $v0, 5 #command for reading an integer
syscall #executing the command for reading an integer
move $t0, $v0 #moving the number read from the user input into the temporary register $t0
#asking the user to provide the second number
li $v0, 4 #command for printing a string
la $a0, prompt2 #loading the string into the argument to enable printing
syscall #executing the command
#reading the second number to be provided to the user
li $v0, 5 #command to read the number provided by the user
syscall #executing the command for reading an integer
move $t1, $v0 #moving the number read from the user input into the temporary register $t1
li $v0, 4 #command for printing a string
la $a0, menu #loading the string into the argument to enable printing
syscall #executing the command
#the next block of code is to read the number provided by the user
li $v0, 5 #command for reading an integer
syscall #executing the command
move $t2, $v0 #this command is to move the integer provided into the temporary register $t2
beq $t2,$t3,addProcess #Branch to 'addProcess' if $t2 = $t3
beq $t2,$t4,subtractProcess #Branch to 'subtractProcess' if $t2 = $t4
beq $t2,$t5,multiplicationProcess #Branch to 'multiplyProcess' if $t2 = $t5
addProcess:
add $t6,$t0,$t1 #this adds the values stored in $t0 and $t1 and assigns them to the temporary register $t6
#The following line of code is to print the results of the computation above
li $v0,4 #this is the command for printing a string
la $a0,resultText #this loads the string to print into the argument $a0 for printing
syscall #executes the command
#the following line of code prints out the result of the addition computation
li $v0,1
la $a0, ($t6)
syscall
li $v0,10 #terminate the program
subtractProcess:
sub $t6,$t0,$t1 #this adds the values stored in $t0 and $t1 and assigns them to the temporary register $t6
li $v0,4 #this is the command for printing a string
la $a0,resultText #this loads the string to print into the argument $a0 for printing
syscall #executes the command
#the following line of code prints out the result of the addition computation
li $v0,1
la $a0, ($t6)
syscall
li $v0,10 #terminate the program
multiplicationProcess:
mul $t6,$t0,$t1 #this adds the values stored in $t0 and $t1 and assigns them to the temporary register $t6
li $v0,4 #this is the command for printing a string
la $a0,resultText #this loads the string to print into the argument $a0 for printing
syscall #executes the command
#the following line of code prints out the result of the addition computation
li $v0,1
la $a0, ($t6)
syscall
li $v0,10 #terminate the program

Answer 1

Pretty much all you want to do is add, subtract or multiply the values from each other one right after another
addProcess:
add $t6,$t0,$t1
add $t6, $t6, $t8
add $t6, $t6, $t9
this adds the two values saving them at $t6, then adds the value at register $t6 to the value at register $t8 while again saving to $t6, then once more.
subtractProcess:
sub $t6,$t0,$t1
sub $t6,$t6, $t8
sub $t6, $t6, $t9
multiplicatioProcess:
mul $t6,$t0,$t1
mul $t6, $t6, $t8
mul $t6, $t6, $t9
Just add these where your single line is, then also add a spot at the top requesting the user enter more values
#asking the user to provide the first number
li $v0, 4
la $a0, prompt1
syscall
#the next block of code is for reading the first number provided by the user
li $v0, 5
syscall
move $t0, $v0
#asking the user to provide the second number
li $v0, 4
la $a0, prompt2
syscall
#reading the second number to be provided to the user
li $v0, 5
syscall
move $t1, $v0
#asking the user to provide the third number
li $v0, 4
la $a0, prompt3
syscall
#reading the second number to be provided to the user
li $v0, 5
syscall
move $t8, $v0
#asking the user to provide the third number
li $v0, 4
la $a0, prompt4
syscall
#reading the second number to be provided to the user
li $v0, 5
syscall
move $t9, $v0
you could also do all of this in the form of a procedure but its more advanced