Write an 8086 assembly language program Which count the numbers of characters in the string s1 where s1 equals i know assembly programming?

Answer 1

Here’s a simple 8086 assembly language program to count the characters in the string "i know assembly programming":

section .data
    s1 db 'i know assembly programming', 0 ; String with null terminator
    count db 0                             ; To store the character count

section .text
    global _start

_start:
    mov si, s1             ; Load address of the string into SI
    xor cx, cx             ; Clear CX for counting characters

count_loop:
    cmp byte [si], 0       ; Check for null terminator
    je done                ; If found, jump to done
    inc cx                 ; Increment character count
    inc si                 ; Move to the next character
    jmp count_loop         ; Repeat the loop

done:
    mov count, cl          ; Store the count in 'count'
    ; Further code to exit or display the count can go here

This program initializes a string and counts the characters until it encounters the null terminator, storing the final count in a variable.