Question :

Write a MIPS assembly language program that

a) Prompt the user for an integer in the range of 0 to 50. If the user inputs 0 the program stops.

b) Otherwise, the program stores the numbers from 0 up to the input value into an array of words in memory, i.e. initializes the array with values from 0 up to N where N is the value that user has inputted.

c) The program then adds the value of all items of the array together (up to N) by loading them from the main memory then add them up, then prints out the sum with the message "The sum of integers from 0 to N is:". For example, if the user gave 5 as the input the program prints out "The sum of integers from 0 to 5 is 15".

My code:

.data

userPrompt : .asciiz "Enter an Integer from 0 to 50 "

zeroMessage : .asciiz " Entered number is 0 , the program will close "

incorrectEntry : .asciiz " Entered number is greater than 50, which is incorrect, program will close"

sumMessage: .asciiz "The sum of integers from 0 to N is: "

InputVal : .word 0

upperLim : .word 50

.data

li $v0, 4 # system call code for print_str

la $a0, userPrompt # address of string to print

syscall # print the string

li $v0, 5 # Read the user input.

syscall # user value will be in vo.

la $t0, InputVal # Store the user input in

move $t0 , $v0 # store the value in $t0

beq $t0, $0 , numbersEqual # check if the user input is 0.

la $t1 , upperLim # load upperLim value 50 to t1

slt $t3,$t0,$t1 # check if the number is less than 51.

beq $t3,$zero,greaterThan # if number is > 50 , exit.

numbersEqual:

li $v0 , 4 # system call code for print_str

la $a0 , zeroMessage # address of string to print

syscall # print the string

li $v0 , 10 # system call code for exit

syscall # exit

greaterThan:

li $v0 , 4 # system call code for print_str

la $a0 , incorrectEntry # address of string to print

syscall # print the string

li $v0 , 10 # system call code for exit

syscall # exit

list: .space 200 # Reserve space for 50 integers

listsz: .word 50 # using an array of size 50

mov $t7,1 # t7 has the number to be stored in array.

lw $s0, listsz # $s0 = array dimension

la $s1, list # $s1 = array address

beq $t7, $t0, initDone # exit loop after storing user input integers. t0 has that value.

sw $t7, ($s1) # list[i] = $t0

addi $s1, $s1, 4 # step to next array cell

addi $t7, $t7, 1 # increment the register $t0

b initlp

initDone:

la $t3,listsz # load base addr. of array

mov $t7,1 # here t7 is used as counter

mov $t2,0 # t2 will store the sum.

loop: beq $t7, $t0, printSum # add the numbers from array.

lw $t4,0($s1) # load array[i]

addi $t3,$t3,4 # increment array pointer

add $t2,$t2,$t4 # update sum

addi $t7, $t7, 1 # increment the loop

b loop

printSum:

# print sum message

li $v0,4

la $a0,sumMessage

syscall

# print value of sum

li $v0,1

addi $a0,$t2,0

syscall

# exit

li $v0 , 10

syscall

I can't figure out what the problem of the code is, please solve the issue and post the revised code.