# array5.s
# This program illustrates how we declare and access some array elements.
# We declare an array called 'array' of 100 integers and initialize all
# elements to the value 7.  The program finds the sum of the first five
# elements, and prints this sum to the screen.
# The distinctive feature about how we use arrays in this program
# is that we refer to constant indices like a[0], ..., a[4].
	
	.data
array:	.word 7:100	# We could have said ".space 400",
			# but that would have initialized elements to 0
			# and we'd like all elements to be 7.

intro_ans:	.asciiz "The sum of the first five elements is "
newline:	.asciiz "\n"

# use of registers
# $s0 = base address of array
# $s1 = element value loaded from array
# $s2 = sum

	.text
main:
	li $s2, 0		# initialize sum to 0
	la $s0, array		# load the base address into $s0


	lw $s1, 0($s0)		# get first element of array
	add $s2, $s2, $s1	# add to sum

	lw $s1, 4($s0)		# get second element of array
	add $s2, $s2, $s1	# add to sum

	lw $s1, 8($s0)		# get third element of array
	add $s2, $s2, $s1	# add to sum

	lw $s1, 12($s0)		# get fourth element of array
	add $s2, $s2, $s1	# add to sum

	lw $s1, 16($s0)		# get fifth element of array
	add $s2, $s2, $s1	# add to sum


	li $v0, 4		# introduce output
	la $a0, intro_ans
	syscall

	li $v0, 1		# print the sum
	move $a0, $s2
	syscall

	li $v0, 4		# print newline (done with output)
	la $a0, newline
	syscall

	li $v0, 10		# end of program
	syscall