# Recursive sum (assembly)

.data

first: .asciiz "\n\nPlease enter an integer:"

sumMsg: .asciiz "\nThe sum from 0 to "

isMsg: .asciiz " is: "

.code

.globl main

###################################################################

# Sum Recursion

# Input: if \$a0 = 0 set \$v0 to zero

# otherwise, subract 1, recursively call Sum and then add \$a0 to \$v0

#

# Output: Return in \$v0 the sum of all \$a0 values that are called in the recursion

#

#

# Note:

# Recursion is NOT the same as implementing a for loop or a dowhile loop

# You will get ZERO points for implementing a loop. The implementation MUST be a recursion.

#

###################################################################

Sum:

###################################################################

# Main

###################################################################

main:

la \$a0,first

syscall \$print_string

syscall \$read_int # get number from user

move \$s0,\$v0 # save the user's integer for later

move \$a0,\$v0 # pass the user's integer as a parameter

jal Sum # recursively sum

la \$a0,sumMsg # print a message to the user letting them know the sum is

syscall \$print_string

move \$a0,\$s0

syscall \$print_int

la \$a0,isMsg

syscall \$print_string

move \$a0,\$v0 # print the sum our recursive function determined

syscall \$print_int

syscall \$exit

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I have recently completed a project with similar requirements. I have a very sound knowledge of C and fairly good knowledge of assembly programming.

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