.text
	.globl main
main:
	#ask for a number
	addi	$v0,	$zero,	51	#load the syscall id into v0
	la	$a0,	msg		#la - load the address of the string
	syscall
	add	$s0,	$a0,	$zero	#copy the return value int s0
	
	#ask for a number
	addi	$v0,	$zero,	51
	la	$a0,	msg
	syscall
	add	$s1,	$a0,	$zero	#copy the return value int s1
	
	#call the sum functiona1
	add	$a0,	$s0,	$zero	#set up the first parameter
	add	$a1,	$s1,	$zero	#set up the second parameter
	
	jal	sum			#call the method
	add	$s2,	$v0,	$zero	#copy the return value into a variable
	
	#print the result
	addi	$v0,	$zero,	56
	la	$a0,	msg2		#prep the string argument	
	add	$a1,	$s2,	$zero 	#prep the int argument
	syscall				#call the MessageDialogInt system call
	
	#exit
	addi	$v0,	$zero,	10
	syscall
	
	#define a function to all the numbers between the two parameters
sum:	
	#allocate memory on the stack for the variable we use. 
	#save the saved registers we will use: fp, ra, s0, s1, s2, s3
	addi	$sp,	$sp,	-24
	sw	$fp,	20($sp)
	sw	$ra,	16($sp)
	sw	$s0,	12($sp)
	sw	$s1,	8($sp)
	sw	$s2,	4($sp)
	sw	$s3,	0($sp)
	
	#modify the frame pointer
	addi	$fp,	$sp,	20
	
	#make s0 the smaller of a0 and a1
	# if(a0 < a1){
	#	s0 = a0;
	#	s1 = a1;
	# }
	# else {
	#	s0 = a1;
	#	s1 = a0;
	# }
	#make s1 the larger
	slt	$t0,	$a0,	$a1	#set t0 to 1 if a0 < a1
	beq	$t0,	$zero,	else
	add	$s0,	$zero,	$a0
	add	$s1,	$zero,	$a1
	j	endif
else:	
	add	$s0,	$zero,	$a1
	add	$s1,	$zero,	$a0
endif:	
	
	#perform the calculation (loop from one to the other)
	#for(s2 = s0; s2 <= s1; s2++)
	#   s3 = s3 + s2;
	add	$s2,	$zero,	$s0
	add	$s3,	$zero,	$zero	#s3 = 0
comp:	addi	$t1,	$s1,	1
	slt	$t0,	$s2,	$t1	#check if s2 <= s1
	beq	$t0,	$zero	end	#if not fall out of the loop
	add	$s3,	$s3,	$s2
	addi	$s2,	$s2,	1
	j	comp
end:
	#put the return value in v0
	add	$v0,	$s3,	$zero
	
	#restore the saved registers
	lw	$fp,	20($sp)
	lw	$ra,	16($sp)
	lw	$s0,	12($sp)
	lw	$s1,	8($sp)
	lw	$s2,	4($sp)
	lw	$s3,	0($sp)
	#pop the stack frame
	addi	$sp,	$sp, -24
	#return to the caller's address
	jr	$ra
				
	.data
	.align 0
msg:	.asciiz "Enter a number."
msg2:	.asciiz "The sum is: "