I need to write a program that will iterate 10 times. Each time it will update a value and print it to the screen.
I know there has to do something with creating a stack and saving the the value so it can iterate back and get to the correct portion to continue with the program. Iv tried many things but I cant figure it out. Here is my code so far
# ############################################################### #
# Phase2.ASM #
# #
# This program will recurse 10 times and show how much interest #
# is made after 10 "months" #
# #
# ############################################################### #
.data
PRINCIPAL: .float 100.0 # principal = $100.00
INTEREST_RATE: .float 0.012 # interest = 1.2%
promptFirst: .asciiz "Your starting Principal is $100.00: \n"
promptSecond: .asciiz "Your interest rate is 1.2%: \n"
promptNow: .asciiz "Interest Made After a Month:\n"
.text
.globl main
main:
First:
# Prints the first prompt
li $v0, 4 # syscall number 4 will print string whose address is in $a0
la $a0, promptFirst # "load address" of the string
syscall # actually print the string
Second:
# Prints the second prompt
li $v0, 4 # syscall number 4 will print string whose address is in $a0
la $a0, promptSecond # "load address" of the string
syscall # actually print the string
jal CI
j EXIT
CI:
la $a0, PRINCIPAL # load the address of the principal
la $a1, INTEREST_RATE # load the address of the principal
lwc1 $f2, ($a0) # load the principal
lwc1 $f4, ($a1) # load the interest rate
mul.s $f12, $f4, $f2 # calculate the balance
li $v0, 4 # syscall number 4 will print string whose address is in $a0
la $a0, promptNow # "load address" of the string
syscall # actually print the string
li $v0, 2 # system call #2
syscall
jr $ra
EXIT:
jr $ra
# END OF THE LINES ###############################################
My Current output so far:
Your starting Principal is $100.00:
Your interest rate is 1.2%:
Interest Made After a Month:
1.20000005
Aany help would really be appreciated. I really am terrible at assembly programming.
PS: The assignment HAS to be done via recursion
EDIT! NEW CODE
# ############################################################### #
# Phase2.ASM #
# #
# This program will recurse 10 times and show how much interest #
# is made after 10 "months" #
# #
# ############################################################### #
.data
PRINCIPAL: .float 100.0 # principal = $100.00
INTEREST_RATE: .float 1.012 # interest = 1.2%
promptFirst: .asciiz "Your starting Principal is $100.00: \n"
promptSecond: .asciiz "Your interest rate is 1.2%: \n"
promptNow: .asciiz "\nYour Balance After A Month:\n"
.text
.globl main
main:
First:
# Prints the first prompt
li $v0, 4 # syscall number 4 will print string whose address is in $a0
la $a0, promptFirst # "load address" of the string
syscall # actually print the string
Second:
# Prints the second prompt
li $v0, 4 # syscall number 4 will print string whose address is in $a0
la $a0, promptSecond # "load address" of the string
syscall # actually print the string
li $t1, 0
jal CI
ENDCI:
j EXIT
CI:
add $t1, $t1, 1
la $a0, PRINCIPAL # load the address of the principal
la $a1, INTEREST_RATE # load the address of the principal
lwc1 $f2, ($a0) # load the principal
lwc1 $f4, ($a1) # load the interest rate
mul.s $f12, $f4, $f2 # calculate the balance
li $v0, 4 # syscall number 4 will print string whose address is in $a0
la $a0, promptNow # "load address" of the string
syscall # actually print the string
li $v0, 2 # system call #2
syscall
beq $t1, 10, ENDCI
jal CI
jr $ra
EXIT:
jr $ra
# END OF THE LINES ###############################################
new output:
our starting Principal is $100.00: Your interest rate is 1.2%:
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
Your Balance After A Month:
101.19999695
So i got the code to iterate 10 times. I need to update the amount so it shows up the previous month + interest added
You need to store the current balance after each update so that the next call doesn't keep using the original value.
I.e. something like this:
lwc1 $f2, ($a0) # load the principal
lwc1 $f4, ($a1) # load the interest rate
mul.s $f12, $f4, $f2 # calculate the balance
swc1 $f12, ($a0)
Before each additional call to CI you also need to save the current return address, and then restore it before returning:
addi $sp,$sp,-4 # push the current return address
sw $ra,($sp) # ...
beq $t1, 10, CIRET
jal CI
CIRET:
lw $ra,($sp) # pop the saved return address
addi $sp,$sp,4 # ....
jr $ra