Print String (Code Inside)

[stalllucy]

HI everyone again...

I hava done a program simply counts the letters in a sentence (Code is below) and print out information about it.

MY PRINT OUT IS LIKE THIS

#######################

Message: "Hello World"

Vovwel analysis: =0, =1, =0, =2, =0

#######################

Vowel analysis part suppose tobe like this

Vovwel analysis: a=0, e=1, i=0, o=2, u=0

.....................

In my code i read all letters from
char: asciiz "aeiou"

and it needs to print it in sequence, here in my code i specify the place it needs to codes to be written...
I ve tride like that

move $a0, $t4
li $v0, 4
syscall

but it gives null


.text
.globl main
main:
li $t1,0
li $t2,0
li $t3,0

la $a0,prompt
li $v0,4
syscall
la $a0,str
syscall
la $a0,jump
syscall
la $a0,prompt2
li $v0,4
syscall

loopChar:

lb $t4,char($t3) # $t4 holds the next letter(a,e,u,i,o) to scan
#
li $t2,0 # After each letter, we need the clear memory
li $t1,0 # $t2 is holds the number of letter in sentence, $t1 each letter of sentence
#
beqz $t4,end


loop:
lb $t0,str($t1)

beqz $t0,print
bne $t0,$t4,con
add $t2,$t2,1

con:
add $t1,$t1,1
j loop

print:

# CODES NEED TO COME HERE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

la $a0,txt
li $v0,4
syscall
move $a0,$t2
li $v0,1
syscall
la $a0,txt2
li $v0,4
syscall

#
add $t3,$t3,1 # add 1 to array of char(a,e,i,o,u) before to move loopChar section
#
j loopChar

end:
li $v0,10 # (usual quit)
syscall


.data

str: .asciiz "Hello world"
#
jump: .asciiz "\n\n"
prompt: .asciiz "Messeage: "
prompt2: .asciiz "Vowel Anlyiys: "
#
char: .asciiz "aeiou"
#
txt: .asciiz "="
txt2: .asciiz ", "

[rxbagain]

The problem is that you are trying to call syscall print string but you are giving the character value instead of a pointer to the asciiz string. What you can do is to add additional variable where you can store the value of t4 and can use syscall print string. Here's the modification I made to your code
...

sb $t4, char_p
la $a0, char_p
# move $a0, $t4
li $v0, 4
syscall

...

char_p: .asciiz "?"Hope it will help :)

Note that I used asciiz so that it will be null terminated