MIPS: Finding average of 5 integers

Question

Objective: Using user input, find the average value using five registers.

Example: 1 3 2 9 4

Output: 3

Output is 3 because 3.8 is a decimal and I want it in integers

My goal is to not use array but I am having trouble adding all 5 registers:

.data
   prompt1: .asciiz " Please enter an integer: "
   prompt2: .asciiz " Please enter an integer: "
   prompt3: .asciiz " Please enter an integer: "
   prompt4: .asciiz " Please enter an integer: "
   prompt5: .asciiz " Please enter an integer: "
   result: .asciiz "The average is: "

.text
main:
   #t0 - hold prompt1
   #t1 - hold prompt2
   #t2 - hold prompt3
   #t3 - hold prompt4
   #t4 - hold prompt5
   #t5 - hold sum from prompt1 to prompt5
   #t6 - hold the average value


   # Prompt the user to enter integer1.
   li $v0, 4        # syscall to print string
   la $a0, prompt1
   syscall

   # Read integer1
   li $v0, 5        # syscall to read an integer
   syscall
   move $t0, $v0        # move number to read into $t0

   # Prompt the user to enter integer 2.
   li $v0, 4
   la $a0, prompt2
   syscall

   # Read integer2
   li $v0,5
   syscall
   move $t1, $v0

   # Prompt the user to enter integer 3.
   li $v0, 4
   la $a0, prompt3
   syscall

   # Read integer3
   li $v0,5
   syscall
   move $t2, $v0

   # Prompt the user to enter integer 4.
   li $v0, 4
   la $a0, prompt4
   syscall

   # Read integer4
   li $v0,5
   syscall
   move $t3, $v0

   # Prompt the user to enter integer 5.
   li $v0, 4
   la $a0, prompt5
   syscall

   # Read integer5
   li $v0,5
   syscall
   move $t4, $v0

the part where I got my error

   # add all integers to $t5
   add $a0, $t0, $t1, $t2, $t3, $t4
   li $v0, 1
   syscall

continued...

   # Read the sum
   li $v0, 5
   syscall
   move $t5, $v0

   # Divide Sum / count
   div $t5, 5

   # retrieve it
   mflo $t6

   #print out the average
   move $a0, t6
   li $v0, 1
   la $a0, result
   syscall

exit:
   li $v0, 10
   syscall

I get an error message

spim:(parser) syntax error on line 71 of ... 'add $a0, $t0, $t1, $t2, $t3, $t4

Answer 1

You can use this code to add 5 integers, this is an improvised version of your code.

.data
   prompt1: .asciiz " Please enter an integer: "
   prompt2: .asciiz " Please enter an integer: "
   prompt3: .asciiz " Please enter an integer: "
   prompt4: .asciiz " Please enter an integer: "
   prompt5: .asciiz " Please enter an integer: "
   result: .asciiz " The average is: "

.text
main:
   #t0 - hold prompt1
   #t1 - hold prompt2
   #t2 - hold prompt3
   #t3 - hold prompt4
   #t4 - hold prompt5
   #t5 - hold sum from prompt1 to prompt5
   #t6 - hold the average value


   # Prompt the user to enter integer1.
   li $v0, 4        # syscall to print string
   la $a0, prompt1
   syscall

   # Read integer1
   li $v0, 5        # syscall to read an integer
   syscall
   move $t0, $v0        # move number to read into $t0

   # Prompt the user to enter integer 2.
   li $v0, 4
   la $a0, prompt2
   syscall

   # Read integer2
   li $v0,5
   syscall
   move $t1, $v0

   # Prompt the user to enter integer 3.
   li $v0, 4
   la $a0, prompt3
   syscall

   # Read integer3
   li $v0,5
   syscall
   move $t2, $v0

   # Prompt the user to enter integer 4.
   li $v0, 4
   la $a0, prompt4
   syscall

   # Read integer4
   li $v0,5
   syscall
   move $t3, $v0

   # Prompt the user to enter integer 5.
   li $v0, 4
   la $a0, prompt5
   syscall

   # Read integer5
   li $v0,5
   syscall
   move $t4, $v0

   # add all integers to $t5
   add $t5, $t0, $t1
   add $t5, $t5, $t2
   add $t5, $t5, $t3
   add $t5, $t5, $t4

   li $t6,5

   # Divide Sum / count
   div $t5, $t5, $t6

  

   #print out the average
   li $v0, 4
   la $a0, result
   syscall

   move $a0, $t5     
   li $v0, 1        #prints average value
   syscall


exit:
   li $v0, 10
   syscall

Answer 2

Does that mean, I have to use arrays to add multiple integers in MIPS?

No, you can keep everything in registers, but you have to use a separate add (or addu) instruction for every + operator in your a+b+c+d+e expression.

The add instruction has exactly two inputs, and one output.

Basic MIPS instruction-set reference.