I'm new to MIPS and I'm using MARS. I can't get my move right and when I execute it gives me some nuts o number. Here is what I have so far, any help would be appreciated.
.data
message1: .asciiz "Enter the any number to subtract :"
message2: .asciiz "\nEnter the any number to subtract :"
n1 : .word 0
n2 : .word 0
message3: .asciiz "\nThe subtraction of the two numbers is "
.text
main:
li $v0 4 #print out message1
la $a0 message1
syscall
li $v0 5 #read message1 as number1
syscall
sw $v0 n1 #store number
li $v0 4 #print out message2
la $a0 message2
syscall
li $v0 5 #read message2 as number2
syscall
sw $v0 n2 #store number
li $v0 4
la $a0 message3
syscall
lw $t0 n1
lw $t1 n2
sub $t0, $v0, $v0 # t0 = number1 s1 - number2 s2
li $v0, 1 # print integer
move $t0, $a0 # move t0 to a0
syscall # run
Your code is doing well until here sub $t0, $v0, $v0.When you subtract you should put the the result in the argument register $a0then you can use move to put that result in return register $v0 for printing.
change them as following it will work.
sub $t2, $t0, $t1 # t2 = t0 - t1
move $a0, $t2 # copy t2 to a0
li $v0, 1 # print integer
syscall #
Another way of doing this subtraction is that you don't need .word and lwat all. As following
.data
message1: .asciiz "Enter the any number to subtract :"
message2: .asciiz "\nEnter the any number to subtract :"
message3: .asciiz "\nThe subtraction of the two numbers is "
.text
main:
li $v0 4 #print out message1
la $a0 message1
syscall
li $v0 5 #read message1 as number1
syscall
move $t0,$v0 # set $t0 to the content of $v0
li $v0 4 #print out message2
la $a0 message2
syscall
li $v0 5 #read message2 as number2
syscall
move $t1,$v0
li $v0 4
la $a0 message3
syscall
sub $a0, $t0, $t1 # t0 = number1 t1 = number2
li $v0, 1 # print integer
syscall # run