.data
a: .asciiz "a = "
b: .asciiz "b = "
tong: .asciiz "Tong a + b = "
hieu: .asciiz "\nHieu a - b = "
.text
main:

akiemtra:
la $a0,a
add $v0,$0,4
syscall

add $v0,$0,5

syscall
add $t0,$0,$v0
blt $t0,$zero,akiemtra

bkiemtra:
la $a0,b
add $v0,$0,4
syscall

add $v0,$0,5
syscall
add $t1,$0,$v0
blt $t1,$zero,bkiemtra
#Tinh Tong
Tong:
	add $t2,$t0,$t1
	la $a0,tong
	add $v0,$0,4
	syscall

	add $a0,$0,$t2
	add $v0,$0,1
	syscall
Hieu:
	sub $t2,$t0,$t1
	la $a0,hieu
	add $v0,$0,4
	syscall

	add $a0,$0,$t2
	add $v0,$0,1
	syscall