Errors in my x86 code for my Assembly Language Project

Question

Please fix the following errors in the following lines of code. I am using x86 code with the Irvine files in Visual Studio:

• Line 98 in my program I have the error A2032 "Invalid use of register"

  cmp eax, edx+7 ; Check if the end of the line is reached for the reviewer number.

• Line 70 of my code I have the error MSB3721 "The command "ml.exe /c /nologo /Sg /Zi /Fo"Debug\NDProject1.obj" /Fl"Project.lst" /I "c:\Irvine" /W3 /errorReport:prompt /TaNDProject1.asm" exited with code 1."

  "<MASM" in the masm.targets file.

• Line 30 of my code I have the error A2006 "undefined symbol : OpenFile"

• Line 34 of my code I have the error A2006 "undefined symbol : ReadLine"

Attached is my code:

INCLUDE Irvine32.inc

.DATA
reviewScores DWORD 4 DUP (5 DUP (0)) ; Two-dimensional array to store review scores (4 rows by 5 columns)

movieNames BYTE "A",0, "B",0, "C",0, "D",0, "E",0
filename BYTE "C:\Data\reviews.txt",0
buffer BYTE 200 DUP (?) ; Increase the buffer size to handle larger lines

.CODE
main PROC
    call ReadFromFile       ; Read movie review information from the file
    call CalculateTotalScores  ; Calculate total scores for each movie
    call DisplayReport      ; Display the report with total scores and the movie with the highest total score

    exit
main ENDP

; Procedure to read movie review information from the file
ReadFromFile PROC
    mov edx, OFFSET reviewScores ; Load the address of the array into edx
    mov ecx, 20                ; Total number of lines in the file (4 reviewers x 5 movies)

    mov ebx, 0                 ; ebx will be used to keep track of the current line number
    mov esi, OFFSET filename   ; Load the address of the file name into esi

ReadLoop:
    ; Open the file for reading
    mov edx, 0                ; Clear edx to use it as a flag for reading mode (0 = read)
    call OpenFile  <<<< line 30 >>>>

    ; Read a line from the file
    mov edx, OFFSET buffer    ; Load the address of the buffer into edx
    call ReadLine  <<<< line 34 >>>>

    ; Check if end of file reached
    cmp eax, 0
    je EndOfFile

    ; Parse the line to extract movie review information
    mov eax, OFFSET buffer
    call ParseLine

    ; Store the review score in the array
    mov eax, dword ptr [edx]  ; Load the review score (0-100) into eax
    mov ebx, dword ptr [edx+4]  ; Load the reviewer number (1-4) into ebx
    mov ecx, dword ptr [edx+8]  ; Load the movie number (0-4) into ecx
    mov edi, OFFSET reviewScores
    imul ebx, ebx, 5          ; Calculate the offset for the reviewer's row
    add edi, ebx
    add edi, ecx              ; Calculate the offset for the movie's column
    mov dword ptr [edi * 4], eax ; Store the review score in the array

    inc ebx                  ; Move to the next line
    jmp ReadLoop

EndOfFile:
    ; Close the file
    mov edx, 1               ; Set edx to 1 to use it as a flag for closing the file
    call CloseFile

    ret
ReadFromFile ENDP

; Procedure to parse a line and extract movie review information
ParseLine PROC
    mov edx, eax              ; Store the address of the line in edx

    ; Extract the movie number (0-4) from the line
    movzx ecx, byte ptr [edx] <<<< line 70 >>>> ; Load the first character of the line into ecx
    sub ecx, 'A'              ; Convert movie letter to index (0-4)
    mov [edx+8], ecx          ; Store the movie number in the buffer

    ; Extract the review rating (0-100) from the line
    mov eax, edx
    mov ecx, 0
ScanRating:
    inc eax                   ; Move to the next character in the line
    movzx ebx, byte ptr [eax] ; Load the next character
    cmp ebx, ','              ; Check if it's a comma
    je FoundComma             ; If yes, we found the end of the rating
    imul ecx, ecx, 10         ; Multiply the current rating by 10 to shift it left
    sub ebx, '0'              ; Convert character to numeric value
    add ecx, ebx              ; Add the numeric value to the rating
    jmp ScanRating

FoundComma:
    mov [edx], ecx            ; Store the review rating (0-100) in the buffer

    ; Extract the reviewer number (1-4) from the line
    mov eax, edx
    mov ecx, 0
ScanReviewer:
    inc eax                   ; Move to the next character in the line
    movzx ebx, byte ptr [eax] ; Load the next character
    sub ebx, '0'              ; Convert character to numeric value
    add ecx, ebx              ; Add the numeric value to the reviewer number
    cmp eax, edx+7 <<<< line 98 >>>> ; Check if the end of the line is reached for the reviewer number
    je DoneParsing            ; If yes, we are done parsing the line
    jmp ScanReviewer

DoneParsing:
    mov [edx+4], ecx          ; Store the reviewer number (1-4) in the buffer

    ret
ParseLine ENDP

; Procedure to calculate the total scores for each movie
CalculateTotalScores PROC
    mov edx, OFFSET reviewScores ; Load the address of the array into edx
    mov ebx, 20                  ; Total number of elements in the array (4 reviewers x 5 movies)
    xor ecx, ecx                 ; Initialize ecx to 0 for the total score

CalculateLoop:
    add ecx, dword ptr [edx]    ; Add the current review score to the total score
    add edx, 4                   ; Move to the next element in the array
    loop CalculateLoop

    ret
CalculateTotalScores ENDP

; Procedure to display the report with total scores and the movie with the highest total score
DisplayReport PROC
    mov edx, OFFSET reviewScores ; Load the address of the array into edx
    mov ebx, 0                   ; Initialize ebx to 0 to keep track of the movie with the highest total score
    mov ecx, 0                   ; Initialize ecx to 0 for the highest total score

    ; Calculate the total score for each movie and find the highest total score
    mov edi, 5                   ; Number of movies (5)
    mov esi, OFFSET movieNames   ; Load the address of the array of movie names into esi

CalculateMovieScores:
    push ecx                     ; Save the highest total score on the stack

    ; Calculate the total score for the current movie
    mov eax, edx
    xor ecx, ecx                 ; Initialize ecx to 0 for the total score of the current movie
    mov ebx, 0                   ; Initialize ebx to 0 for the reviewer index

CalculateMovieTotal:
    add ecx, dword ptr [eax]     ; Add the current review score to the total score of the current movie
    add eax, 20                  ; Move to the next movie's review score
    inc ebx                      ; Move to the next reviewer's review score
    cmp ebx, 4                   ; Check if we have processed all reviewers
    jle CalculateMovieTotal      ; If not, calculate the next reviewer's score

    ; Display the total score for the current movie
    pop eax                      ; Restore the highest total score from the stack to eax
    cmp ecx, eax                 ; Compare the current movie's total score with the highest total score
    jle NotHighestScore          ; If the current score is not the highest, skip displaying it

    mov ebx, eax                 ; Update the highest total score with the current movie's total score
    mov esi, OFFSET movieNames   ; Load the address of the array of movie names into esi
    call WriteString             ; Display the movie name
    mov eax, ecx                 ; Load the current movie's total score into eax
    call WriteDec                ; Display the total score
    call Crlf                   ; Move to the next line

NotHighestScore:
    add esi, 4                   ; Move to the next movie name
    dec edi                      ; Move to the next movie
    cmp edi, 0                   ; Check if we have processed all movies
    jg CalculateMovieScores      ; If not, calculate the next movie's score

    ret
DisplayReport ENDP

END main

This is the reviews.txt file:

D,84,2
A,90,3
A,87,4
B,35,4
B,100,1
C,75,1
D,84,1
B,87,2
A,0,2
C,25,2
D,45,3
E,35,3
A,90,1
B,100,3
C,75,3
E,35,1
C,78,4
E,35,2
D,100,4
E,0,4

Thank You

I have tried many things and they've all failed, could really use some help. Errors in code

Answer 1

• Line 30 of my code I have the error A2006 "undefined symbol : OpenFile"
• Line 34 of my code I have the error A2006 "undefined symbol : ReadLine"

With INCLUDE Irvine32.inc you don't get access to OpenFile or ReadLine.
The file does however define next prototypes:

OpenInputFile PROTO ; open file in input mode
ReadFromFile PROTO ; read buffer from input file

---

• Line 98 in my program I have the error A2032 "Invalid use of register"
  cmp eax, edx+7 ; Check if the end of the line is reached for the reviewer number.

Like @PeterCordes wrote in a comment, the cmp eax, edx+7 instruction is not encodable. You need to put the address expression EDX + 7 in a register of its own.
I suggest the following solution that temporarily raises the EDX register by 7, so it can be used in the cmp eax, edx instruction:

FoundComma:
    mov   [edx], ecx          ; Store the review rating (0-100) in the buffer
    ADD   EDX, 7              <<<< Temporarily change EDX >>>>
    ; Extract the reviewer number (1-4) from the line
    mov   eax, edx
    XOR   ECX, ECX
ScanReviewer:
    inc   eax                 ; Move to the next character in the line
    movzx ebx, byte ptr [eax] ; Load the next character
    sub   ebx, '0'            ; Convert character to numeric value
    add   ecx, ebx            ; Add the numeric value to the reviewer number
    cmp   eax, EDX            ; Check if the end of the line is reached for the reviewer number
    jne   ScanReviewer        ; If no, we are not done parsing the line
    SUB   EDX, 7              <<<< Restore EDX to what it was before >>>>
    mov   [edx+4], ecx        ; Store the reviewer number (1-4) in the buffer
    ret
ParseLine ENDP