Question

CSE/EEE 230 Assignment 4
Fall 2019
Due Sept 30 (11:59PM)
In this assignment, you are to complete a MIPS program so it will perform the required tasks. The main function of the code is provided. Do not change the code in the main function. There is a loop in the main function.
You are to complete the program by writing two functions. Pay particular attention to the purpose of each function and how the parameters and return value are to be used.
1. getinput
$a0 - minimum value
$a1 – maximum value
$v0 – integer input in range defined
This function must prompt the user to input an integer and then get the input from the user. The process of printing a prompt and then reading input must be repeated until a value from the minimum to the maximum values is read (inclusive). The input value is then returned in $v0.
2. printsum
The function is to the add the two parameters ($a0 and $a1) and then print the sum.
Sample Input and output:
Enter a number 2  This means that the main will loop 2 times.
Enter a number 7
Enter a number 3
The sum is 10
Enter a number -3
Enter a number -1
Enter a number 25
Enter a number 3
Enter a number 0
Enter a number 6
The sum is 9
General:
• Comment the beginning of your programs with your name and assignment number.
• Comment every instruction.
• Comment each function. Describe which registers are used in the function and how they are used.
Submit your .asm file with the complete program.
Copyright 2019 D.Calliss Arizona State University All rights reserved.
.data
# add any strings at this point as needed
.text
.globl main
main:
addi $a0, $0, 2 # set minimum value as 1
addi $a1, $0, 5 # set maximum value as 15
jal getinput # get a positive number for the loop
addi $s0, $v0, 0 # save input value
repeat:
beq $s0, $0, end # while there are more repeats
addi $a0, $0, 1 # set minimum value as 1
addi $a1, $0, 15 # set maximum value as 15
jal getinput # get a value from 1..15
ori $s1, $v0, 0 # save the result
addi $a0, $0, 3 # set minimum value as 3
addi $a1, $0, 18 # set maximum value as 18
jal getinput # get a value from 4..18
ori $a1, $v0, 0 # set the second parameter for printsum
ori $a0, $s1, 0 # set the first parameter for printsum
jal printsum # call function to print sum of input
addi $s0, $s0, -1 # decrement counter
j repeat # do it again
end: ori $v0, $0, 10 # set command to stop program,
syscall # end program

Answer 1

Screenshot

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Program

.data
    input: .asciiz "Enter a number "
    output: .asciiz "The sum is "
# add any strings at this point as needed
.text
.globl main
main:
   addi $a0, $0, 1 # set minimum value as 1
   addi $a1, $0, 15 # set maximum value as 15
   jal getinput # get a positive number for the loop
   addi $s0, $v0, 0 # save input value
repeat:
   beq $s0, $0, end # while there are more repeats
   addi $a0, $0, 1 # set minimum value as 1
   addi $a1, $0, 15 # set maximum value as 15
   jal getinput # get a value from 1..15
   ori $s1, $v0, 0 # save the result
   addi $a0, $0, 3 # set minimum value as 3
   addi $a1, $0, 18 # set maximum value as 18
   jal getinput # get a value from 4..18
   ori $a1, $v0, 0 # set the second parameter for printsum
   ori $a0, $s1, 0 # set the first parameter for printsum
   jal printsum # call function to print sum of input
   addi $s0, $s0, -1 # decrement counter
   j repeat # do it again
end:
   ori $v0, $0, 10 # set command to stop program,
   syscall # end program

#Function to get input from user
getinput:
   #Save arguments min and max temporary
   add $t0,$0,$a0
   add $t1,$0,$a1
#Loop to check the upper and lower bounds of input
again:
   #Display prompt for input
   addi $v0,$0,4
   la $a0,input
   syscall
   #Read input
   add $v0,$0,5
   syscall
   #Bounds check
   blt $v0,$t0,next
   bgt $v0,$t1,next
   #Return to main
   jr $ra
#If not in the bound ask again
next:
   j again

#Function to generate sum
printsum:
   #Find sum and store in t0
   add $t0,$a0,$a1
   #Display output message
   add $v0,$0,4
   la $a0,output
   syscall
   #Display sum
   add $a0,$0,$t0
   addi $v0,$0,1
   syscall
   #Print next line
   addi $a0,$0,10
   addi $v0,$0,11
   syscall
   #Return to main
   jr $ra

------------------------------------------------

Output

Enter a number 2
Enter a number 7
Enter a number 3
The sum is 10
Enter a number -3
Enter a number -1
Enter a number 25
Enter a number 3
Enter a number 0
Enter a number 6
The sum is 9