This is a simple program to take two numbers from the user and perform #basic arithmetic functions such as addition, subtraction and multiplication with them #Program flow: #1. Print statements to ask the user to enter the two different numbers #2. Store the two numbers in different registers and print the ‘menu’ of arithmetic instructions to the user #3. Based on the choice made by the user, create branch structures to perform the commands and print the result #4. Exit the program.
My struggle: When I enter number 3 (which is 'multiply' option) everything works fine. But when I enter '1' my program prints out Your final result is: 5Your final result is: -1Your final result is: 6 It prints out 3x times! And when I enter '2' it prints out Your final result is: 1Your final result is: 6
I'm struggling to see where my logic is missing. Also - how to prevent user from entering number that is different from 1-3?
prompt1: .asciiz "Enter the first number: "
prompt2: .asciiz "Enter the second number: "
menu: .asciiz "Enter the number associated with the operation
you want performed: 1 => add, 2 => subtract or 3 => 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
#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,multiplyProcess #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 #This is to 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 #This is to terminate the program
multiplyProcess:
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 #This is to terminate the program
```
