Hello, I am trying to count the number of characters in a string $a0 that return a 1 when passed to the function, otherwise return 0. Heres what I did: I dont have the correct answer __ output format must be 3, I have 11
.text
.globl __start
__start: # execution starts here */
la $a0,ans
li $v0,4 # print out string
syscall
la $a0,str
jal strchk # call strchk function
move $a0,$v0
li $v0,1 # print out returned value
syscall
la $a0,endl # system call to print
li $v0,4 # out a newline
syscall
li $v0,10
syscall # au revoir...
#
# checkch is a function which takes a character
# in a0, and returns either 0 or 1 in v0,
# depending on the result of some test.
# Do not rely of the particular operation performed
# by checkch or the registers used.
# These will be different in other mipsmark cases.
#
checkch:
li $v0,0
beq $a0,'a',yes
beq $a0,'e',yes
beq $a0,'i',yes
beq $a0,'o',yes
beq $a0,'u',yes
jr $ra
yes: li $v0,1
jr $ra
#/* Any changes above this line will be discarded by
# mipsmark. Put your answer between dashed lines. */
#/*-------------- start cut ----------------------- */
strchk:
sub $sp, $sp, 16 # adjusting a stack pointer to store an address of string and return an address
sw $a0, 0($sp)
sw $s0, 4($sp)
sw $s1, 8($sp)
sw $ra, 12($sp)
li $s0, 0 # for total vowel count
move $s1, $a0 # move address in $a0
loop:
lb $a0, 0($s1) # load char in $a0
beqz $a0, done # if null char, branch to done
jal checkch # jump to checkch
# add $s0, $s0, $v0 # increment an address offset
addi $s1, $s1, 1 # add vowel counter
# j loop
bne $a0, $v0, jump
jump:
add $s0, $s0, 1
j loop
done:
move $v0, $s0 # use $v0 for result
lw $a0, 0($sp)
lw $s0, 4($sp)
lw $s0, 8($sp)
add $a0, $0, $s1
lw $ra, 12($sp) # retrieve a return address
lw $a0, 0($sp) # retrieve value in $a0
add $sp, $sp, 16 # adjust stack pointer
jr $ra # jump to calling
#/*
j __start #nasty loop if mips program not exited */
#/*-------------- end cut -----------------------
# Any changes below this line will be discarded by
# mipsmark. Put your answer between dashed lines.
#################################################
# #
# data segment #
# #
#################################################
.data #*/
str: .asciiz "aei0956xyz\n"
ans: .asciiz "number of characters that pass test = "
endl: .asciiz "\n"
#
