This assembly language program takes a string as input from the user, counts the number of occurrences of each word in the string, and displays the words and their counts. It uses a frequency table to store the counts, loops through the input string to count each character and increment the appropriate table entry, then displays the non-empty table entries showing each word and its count.

1. Important Note: This code needs to be able to compile in Microsoft Visual Studio.
Write an assembly language program to input a string from the user, count and display the
number of times each word occur in the user input string. For example if the user types in:
"Hello there how are you, there you are Hello Hello you" Your output should be: Hello 3 there
2 how 1 are 2 you 3
Solution
DisplayTable PROC
;
; Display the non-empty entries of the frequency table.
; This procedure was not required, but it makes it easier
; to demonstrate that Get_frequencies works.
;-------------------------------------------------------------
.data
colonStr BYTE ": ",0
.code
call Crlf
mov ecx,LENGTHOF freqTable ; entries to show
mov esi,OFFSET freqTable
mov ebx,0 ; index counter
;; tigher version of your char-count loop
xor eax, eax ; clear upper bits of EAX
L1:
lodsb ; AL = [ESI], inc ESI
inc DWORD PTR [edi + eax*4] ; inc table[AL]
test al,al ; Set flags based on AL
jz L1 ; loop if it's not the end of the string
;; fall through when done
;;dec DWORD PTR [edi] ; undo the count of the zero if you care

2. L2: add esi,TYPE freqTable ; point to next table entry
inc ebx ; increment index
loop L1
call Crlf
ret
DisplayTable ENDP
END main
.data
str2 BYTE "one two three",0
.code
main proc
mov edi,OFFSET str2
Mov esi,edi
Mov Ecx, 0 ;reset ecx to 0
Not Ecx ;set Ecx to -1 or highest possible integer
Mov Al, ' ' ;Initialize a1 to delimiter of (space) ' '
Cld ;Clear Direction Pointer
Repne Scasb ;scan edi one byte at a time until delimiter found
Not Ecx
Lea Eax, [ecx-1] ;Set Eax to index of found delimiter
Xchg Esi, Edi ;Take Edi which is now equal to string after found delimiter and put in esi
mov edx, esi
call WriteString
main endp
end main