How to use bne in mips? - conditional-statements

Question

So I am trying to bne as if statements in my code to jump to labels. From what i understand bne is does not equal go to label specified. But the problem is i'm not getting any output for my print statements. Am i using bne wrong? I apologize for the ugly code, it's my first time using mips.
# Arthor: Christian Soto
#
# Simple conditional statements
.data
MSG: .asciiz "Copying from alpha to charlie. Before: "
string2: .asciiz " After: "
string3: .asciiz " alpha was the same as bravo."
string4: .asciiz "alpha was the same as charlie."
string5: .asciiz "bravo was the same as charlie."
string6: .asciiz "\n"
string7: .asciiz "alpha-bravo-charlie="
my_var: .word 1
copy: .word 2
dups: .word 1
alpha: .word 2
charlie: .word 2
bravo: .word 2
.text
.globl studentMain
studentMain:
addiu $sp, $sp, -24 # allocate stack space -- default of 24 here
sw $fp, 0($sp) # save caller’s frame pointer
sw $ra, 4($sp) # save return address
addiu $fp, $sp, 20 # setup main’s frame pointer
#Load vaiables
#set $s0 = copy
la $t0, copy
lw $s0, 0($t0)
#set $s1 = dups
la $t0, dups
lw $s1, 0($t0)
#set $s2 = subtract
#la $t0, subtract
#lw $s2, 0($t0)
#set $s3 = print
#la $t0, print
#lw $s3, 0($t0)
#set $s4 = alpha
la $t0, alpha
lw $s4, 0($t0)
#set $s5 = bravo
la $t0, bravo
lw $s5, 0($t0)
#set $s6 = charlie
la $t0, charlie
lw $s6, 0($t0)
#set $s7 = my_var
la $t0, my_var
lw $s7, 0($t0)
#Task 1: copy
bne $s7, $s0, DO_DUPS #if they do not equal then do dups
li $v0, 4
la $a0, MSG
syscall
la $t0, charlie #t0 = &charlie
lw $t0, 0($t0) #t0 = charlie
li $v0, 1
la $a0, ($t0)
syscall
li $v0, 4
la $a0, string2
syscall
la $t1, alpha #t1 = $alpha
lw $t2, 0($t1) #t2 = alpha
add $s6, $zero, $t2 #s6 = t2
li $v0, 1
la $a0, ($s6)
syscall
#Task 2: Dups
DO_DUPS:
bne $s7, $s1, DO_SUBTRACT #if they do not equal then do subtract
bne $s4, $s5, DO_NEXT #compare alpha and bravo else print message
li $v0, 4
la $a0, string3
DO_NEXT:
bne $s4, $s6, DO_NEXT2 #compare alpha and charlie else print message
li $v0, 4
la $a0, string4
DO_NEXT2:
bne $s5, $s6, DO_SUBTRACT #compare charlie and bravo else print message
li $v0, 4
la $a0, string5
DO_SUBTRACT:
#Task 3: Subtract
#Task 4: Print
j DONE
DONE: # Epilogue for main -- restore stack & frame pointers and return
lw $ra, 4($sp) # get return address from stack
lw $fp, 0($sp) # restore the caller's frame pointer
addiu $sp, $sp, 24 # restore the caller's stack pointer
jr $ra # return to caller's code

Answer 1

i forgot to add a syscall to see the results but i fixed it now