Monday, March 14, 2016

8086 Assembly Diamond Print in Console using Loop Explained Code

March 14, 2016 , , , , , , , , ,

Instruction:

It can't handle input of 0 or 1. If you require it then edit and check condition for 0 and 1. If the code seems obscure please debug using 8086 line by line to understand what is changing & how its working.

Code:

;Author:quickgrid
;Site: http://quickgrid.blogspot.com
;Code: 8086 assembly diamond print dual loop explained code
org 100h
.stack 100h
.data
;variable definitions
i db ?
j db ?
k db ?
num db '1'
counter db 1
input db ?
counter2 db ?
.code
.startup
;take input
mov ah, 1
int 21h
mov j, al
;save the input in a variable
mov input, al
;print new line
mov ah, 2
mov dl, 0dh
int 21h
mov dl, 0ah
int 21h
;upper triangle loop
upper_triangle_loop:
;move current outer loop counter to i
mov bl, j
mov i, bl
;skip printing space in the last loop
cmp i, '1'
je skip_space_loop
;loop and print space
space_loop:
mov dl, ' '
mov ah, 2
int 21h
dec i
cmp i, '1'
jne space_loop
skip_space_loop:
;reset loop counter to print more numbers
mov bl, counter
mov k, bl
;print output numbers in loop
number_print_loop:
;check if even or odd
mov al, num
mov bl, 2
div al
;print space if in even positions
cmp al, 0
je print_space
; print number
mov dl, num
mov ah, 2
int 21h
;if number printing skipped then print space
print_space:
mov dl, ' '
mov ah, 2
int 21h
;exit loop if loop counter is zero
dec k
cmp k, 0
jg number_print_loop
;increment counter to print two more numbers than previous
add counter, 1
inc num
;print new line
mov ah, 2
mov dl, 0dh
int 21h
mov dl, 0ah
int 21h
dec j
cmp j, '0'
jne upper_triangle_loop
;reset all previously used variables
mov bl, input
mov j, bl
mov bl, 1
mov counter, bl
dec num
;loop twice the size of previous value minus one
mov bl, input
sub bl, 30h
mov counter2, bl
;print the lower triangle
lower_triangle_loop:
;replaces i with new counter value
mov bl, counter
mov i, bl
;print spaces
space_loop2:
mov dl, ' '
mov ah, 2
int 21h
dec i
cmp i, 0
jne space_loop2
;increment counter to print one more space than previous
inc counter
mov bl, counter2
mov k, bl
dec num
;print the numbers
number_print_loop2:
mov al, num
mov bl, 2
div al
cmp al, 0
je print_space2
mov ah, 2
mov dl, num
int 21h
print_space2:
mov ah, 2
mov dl, ' '
int 21h
dec k
cmp k, 1
jne number_print_loop2
dec counter2
;print new line
mov ah, 2
mov dl, 0dh
int 21h
mov dl, 0ah
int 21h
dec j
cmp j, '1'
jne lower_triangle_loop
;print new line
mov ah, 2
mov dl, 0dh
int 21h
mov dl, 0ah
int 21h
.exit
view raw 8086 asm diamond print using user input.asm hosted with ❤ by GitHub

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)

POPULAR POSTS

BLOG ARCHIVE

Information

This site is continuation of:
https://quickgrid.wordpress.com

Version

QuickGrid Version 0.1.ß

Changelog

- Google Pagespeed ranking decreased to 80/100
- Not Fixed: Navbar scrolling smooth transition
- Not Fixed: Article header redesign
- Not Fixed: Tablet view webpage style