# a MAL program to add up the first n integers,
# where n is a positive integer entered by the user.

		.data
# strings for making the output look nice
str1:		.asciiz	"Please enter a positive integer: "
str2:		.asciiz	"The sum of the first "
str3:		.asciiz	" integers is "
newline:	.byte	'\n'

# variable declarations
n:		.word	0	# user entered integer
sum:		.word	0	# running sum of the first n integers
i:		.word	0	# integer counter, 0 to n
tmp:		.word		# used for comparisons

		.text
__start:	la	$a0,str1	# puts	str1
		li	$v0,4
		syscall

		li	$v0,5	# get	n
		syscall
		sw	$v0,n

		lb	$a0,newline	# put	newline
		li	$v0,11
		syscall

for:		lw	$a0,n	# sub	tmp,n,i
		lw	$v0,i
		sub	$v0,$a0,$v0
		sw	$v0,tmp

		lw	$a0,tmp	# bltz	tmp,endfor
		bltz	$a0,endfor

		lw	$a0,sum	# add	sum,sum,i
		lw	$v0,i
		add	$v0,$a0,$v0
		sw	$v0,sum

		lw	$a0,i	# add	i,i,1
		li	$v0,1
		add	$v0,$a0,$v0
		sw	$v0,i

		b	for

endfor:		la	$a0,str2	# puts	str2
		li	$v0,4
		syscall

		lw	$a0,n	# put	n
		li	$v0,1
		syscall

		la	$a0,str3	# puts	str3
		li	$v0,4
		syscall

		lw	$a0,sum	# put	sum
		li	$v0,1
		syscall

		lb	$a0,newline	# put	newline
		li	$v0,11
		syscall

		li	$v0,10	# done
		syscall