;; count words in a string
;;
        .model small
	.586
	.stack 100h
	.data
	msg1   db "Enter a string (max 40 chars): ",0 
	msg2   db "Number of words in string is: ",0
	;;leave space in buffer for one char past string for terminator
        buf    db  40
	       db  0
    	buffer db  40+1 dup (?)

	.code
	extern	Crlf:proc, Writestring:proc, Writeint:proc

	main		proc
			mov	ax,@data
			mov 	ds,ax
			call	Crlf
			mov	dx,offset msg1
			call	Writestring
			mov	ah,0ah
			mov	dx, offset buf
			int	21h
			call	crlf
	;; mark end of string
			mov	cl,[buf+1]  ;; get count of chars entered
			xor	ch,ch
			mov	bx,offset buffer
			add	bx,cx	    ;; add count of chars entered
			mov	[bx],ch	    ;; write a null byte at end of string
	;; count words
		   	xor     cx,cx	    ;; cx will have count
			mov	bx,offset buffer 				
	lp1:
			mov	al,[bx]
			inc	bx	    ;; point at next byte
			cmp	al,0
			je	exit	    ;; at end of string
			cmp	al,20h	    ;; check if space
			je	lp1	    ;; loop while space
			inc	cx	    ;; found a word
	lp2:
			mov	al,[bx]	    ;; get next char
			inc	bx
			cmp	al,0
			je	exit
			cmp	al,20h
			jne	lp2	     ;; loop while space
			jmp	lp1	     ;; look for other spaces
	exit:
			mov	dx,offset msg2
			call	Writestring			
			mov	ax,cx
			mov	bx,10
			call	writeint     ;; print the integer
			call	crlf
			Mov	ax, 4c00h	;exit
			Int	21h

	Main		endp

end main
			
			
			
	

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