# Answer to Quiz 4
        .globl  main
main:   add     $s7, $0, $ra    # save return address

	.data 
  A:	.word  4, 9, 25, 49, 121, 169, 289, 0  # squares of first 7 primes
	.text
################# Answer to Problem 2 ##########################
	la	$s1, A          # start address of A
        addi    $s2, $0, 0      # running sum
        
 Loop:  lw      $t1, 0($s1)     # $t1 = A[$s3]
        beq     $t1, $0, Exit   # exit Loop when get to 0 at end
        add     $s2, $s2, $t1   # $s2 = sum of A[] so far
        addi    $s1, $s1, 4     # $s1 += 4
        j       Loop            # go back around loop

 Exit:  addi    $v0, $0, 1      # print the sum
        add     $a0, $0, $s2
        syscall
################# End of Answer to Problem 2 ###################
        addi    $v0, $0, 4      # print a newline
        la      $a0, Newln
        syscall

        add     $ra, $0, $s7    # restore return address
        jr      $ra
        .data
Newln:  .asciiz "\n"
################# Output #######################################
# ten42% spim -file exam1_2.s
# 666
################# End of output ################################