MIPS, why this branch doesn't work?

Question

I have to do a bne taking one argument from an array declared pp: .space 40, in that array i put integer, 0 or 1, it's a flag. But whatever I do, the bnenever work! How I have to pass the argument??

li $s5, 0
li $t1, 10
la $s0, pp # address 
la $s1, nome # address 
la $s2, cognome # address 
la $s3, interessi # address 
la $s4, userid # address

looplista:
beq $s5, $t1, exit

# check flag


printarray:
lw $t2, 0($s0) 


li $t0, 0
bne $t0, $t2, SALTO  

How i store

la $s1, pp

mul $t2, $s7, 4
add $s1, $s1, $t2      #s7=0 array size counter

# prompt for name
li      $v0, 4
la      $a0, ppdom          
syscall                         #ask name

# store name (max 4 bytes) to pp_array ($s1)  
move $a0, $s1
li      $a1, 4
li      $v0, 5
syscall

Answer 1

I solved the problem, read int function return the valor in $v0, I used $a0

la $s1, pp

mul $t2, $s7, 4      #s7=0 array size counter

# prompt for name
li      $v0, 4
la      $a0, ppdom          
syscall                         #ask 

li $v0, 5
syscall
sw $v0, pp($t2)