CODEWITHSUNDEEP
assemblymipsmips32
Song Tùng
Song Tùng

Reputation: 171

Cannot store the answer to memory in MIPS

I'm trying to write a function in MIPS that would take in a string and return the number of character inside the string. This is what I have so far

# Program to calculate string length of any given string

            .data
mystring:   .asciiz "Hello, World!"
answer:     .word 0

            .text
            .globl main
main:       la      $a0, mystring   # Load base adress of the string into function argument

            jal     strlen          # jump to strlen and save position to $ra

            sw      $vo, answer     # Store the answer to memory

            li      $v0, 10         #exit
            syscall


strlen:     li      $v0, 0          # Initialize counter = 0

stringLoop: lb      $t0, 0($a0)     # Load first word of the string

            beq     $t0, $zero, end # if $t0 == '\0' then exit the loop

            addi    $a0, $a0, 1     # Increment the address (go to the next character)

            addi    $v0, $v0, 1     # Increment the counter

            b       stringLoop

end:        jr      $ra             # Return to main program

Everytime I try to run it with QtSpim, it gives me a syntax error at the line "sw $vo, answer". Could someone please tell me what is wrong with my program? Thanks

Upvotes: 1

Views: 304

Answers (1)

Eraklon
Eraklon

Reputation: 4288

Syntax errors are often caused by typos as in your case. You accidentally wrote vo instead of v0.

Upvotes: 2

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