Monday, March 14, 2016
8086 Assembly Even Odd Checking Code Explanation Line by Line
March 14, 2016
8086 asm explanation
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8086 asm macro usage
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8086 assembly
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asm string load
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assembly tutorial
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condition checking
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even odd check asm
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jumping labels
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loop counter
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print
Instruction:
Compile and run the code in emu8086 for easier usage. Input is any number from 0-9.Code without Loop:
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| ;Author:quickgrid | |
| ;Site: http://quickgrid.blogspot.com | |
| ;Code: Even odd check 8086 assembly code | |
| ;predefined macro for speed coding | |
| ;define any code here that is reduandant | |
| newline macro | |
| lea dx,nl | |
| mov ah,9 | |
| int 21h | |
| endm | |
| .model small | |
| .stack 100h | |
| .data | |
| ;remermber to put a $ after or if you want it | |
| ;keep executing than put it on other line | |
| msg1 db 'number is even', '$' | |
| msg2 db 'number is odd', '$' | |
| nl db 0dh,0ah, '$' | |
| .code | |
| .startup | |
| ;initialize data segment | |
| mov ax,@data | |
| mov ds,ax | |
| ;ah=1 is take input, int 21h execute above command | |
| mov ah,1 | |
| int 21h | |
| ;divide al by whatever is in bl | |
| mov bl,2 | |
| div bl | |
| ;ah contains remainder after division, al contains the operand, no need for | |
| ;operand anymore replace with remainder | |
| mov al,ah | |
| ;check if remainder is zero | |
| cmp al,0 | |
| ;use any condition here jump greater, jump if not equal etc | |
| jg odd | |
| ;if it was a odd number than it would never reach here | |
| ;print a new line if even | |
| even: | |
| newline | |
| ;print the string in msg1 and skip rest of the code to exit label | |
| lea dx,msg1 | |
| mov ah,9 | |
| int 21h | |
| jmp exit | |
| ;the previous jg odd label jumps to here skipping even portion of the code | |
| odd: | |
| newline | |
| ;show the message for odd number | |
| lea dx,msg2 | |
| mov ah,9 | |
| int 21h | |
| ;just a jump label to skip executing some codes | |
| exit: | |
| .exit |
Code with Loop:
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| ;Author:quickgrid | |
| ;Site: http://quickgrid.blogspot.com | |
| ;Code: Even odd check using loop in 8086 assembly explained code | |
| .model small | |
| .stack 100h | |
| .data | |
| msg1 db ': odd$' | |
| msg2 db ': even$' | |
| .code | |
| main proc | |
| mov ax, @data | |
| mov ds, ax | |
| ;when loop called it uses cx as counter | |
| mov cx, 9 | |
| ;loop label | |
| looper: | |
| ;input a number | |
| mov ah, 1 | |
| int 21h | |
| ;divide any number in al by bl or 2 here | |
| mov bl, 2 | |
| div bl | |
| cmp ah, 1 | |
| je even | |
| mov ah, 9 | |
| lea dx, msg2 | |
| int 21h | |
| jmp skip | |
| even: | |
| mov ah, 9 | |
| lea dx, msg1 | |
| int 21h | |
| skip: | |
| ;prints a newline | |
| mov ah, 2 | |
| mov dl, 0dh | |
| int 21h | |
| mov dl, 0ah | |
| int 21h | |
| loop looper | |
| main endp | |
| end main |
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