Question

Assembly Programming

INCLUDE Irvine32.inc

Make a program that takes a string and a word as inputs from the user and searches
the word in the string. If it finds the word in the string, it prints “ Found”, else it prints “ Not
found”. Note that i t is not searching for the matching characters but searching for the
corresponding word. For example, suppose a string is “I am a teacher.” and a word for
search is “tea”. Now the string has four words; I, am, a, teacher. Now the searched word,
“tea” is not there. So, your program has to say, Not found”.

An example for your program is shown in below box .
NOTE:
1. The string length does not exceed 40 characters.
2. ‘Enter’ character (<ent>) is not counted in string length.
3. If input string is larger than 40 characters, ignore the string and get input again.
4. You can freely define procedures in your convenience.
5. Input Enter character (<ent>) to finish the program.

Type_A_String: I like MUSIC
A_Word_for_Search: MUSIC
Found
Type_A_String: I am a student
A_Word_for_Search: stud
Not found
Type_A_String: I like MUSIC ..↲
A_Word_for_Search: MUS
Not found
Type_A_String:
Bye!

Answer 1

.stack 200h

.data

message1 db "Enter the text here: $"
text db 150,151 dup(0)
message2 db 10,13,"Enter the word that you want to find: $"
find db 20,21 dup(0)
yesmessage db 10,13,"Found$"
nomessage db 10,13,"Not found$"

.code
Start:

;Display message and key in strings
mov ax,seg message1
mov ds,ax

mov si,offset text
mov di,offset find

mov dx,offset message1
mov ah,09h
int 21h

mov dx,si
mov ah,0Ah
int 21h

mov ax,seg message2
mov ds,ax

mov dx,offset message2
mov ah,09h
int 21h

mov dx,di
mov ah,0Ah
int 21h

;compare strings
mov bx,00

mov bl,text+1
mov bh,find+1

cmp bl,bh
jne L1

add si,2
add di,2

L2:mov bl,byte ptr[si]
cmp byte ptr[di],bl
jne L1
inc si
inc di
cmp byte ptr[di],"$"
jne L2
mov ah,09h
mov dx,offset yesmessage
int 21h
L1:mov ah,09h
mov dx,offset nomessage
int 21H

mov ax,4c00h
int 21h
end start