Register returning a hex value 1 higher than it should (8085 assembly) -

-

i working on assignment intro computer engineering class. trying write subroutine takes number input user , returns number in h register.

from can see, works fine single digit inputs when try continue on , add one, returns (input #)+1 in h register.

inputs not exceed 2 characters , not greater 20.

readn:  ; subroutine reads number digit user          ; , returns number in h         ; inputs: none         ; outputs: h register          push    b         push    psw         push    h          ; store registers in stack          mvi     b,0        ; 0 out b register          lxi     d,mess4    ; "enter number: $"         call    bdos       ; bdos = 0005  nextn:  mvi     c,1        ; c = 1 --> read character         call    bdos         cpi     cr         ; cr = 0dh (carriage return)         jz      lastn      ; if input carriage return --> go lastn          mvi     h,10       ; set h register multiplication          sui     '0'        ; subtract ascii 0 input, leaving numerical value         mov     e,a        ; store accumulator in e register         mov     a,b        ; bring b register (existing number) accumulator  mult:   add     b                   dcr     h          ; decrements multiplication tracker          jnz     mult       ; if h != 0 --> redo addition          add     e          ; add e register (new input) old input*10         mov     b,a        ; store result in b          jmp     nextn      ; redo input  lastn:  pop     h         mov     h,b         pop     psw         pop     b         ret

can see might doing wrong here? hope provided everything, let me know if need clear code.

thanks!

it because:

        mov     a,b        ; bring b register (existing number) accumulator mult:   add     b                   dcr     h          ; decrements multiplication tracker          jnz     mult       ; if h != 0 --> redo addition

you load accumulator b, it's b*1, loop runs 10 times , adds b*10 it, b*11. either run loop 9 times or start zeroed accumulator.

ps: learn use debugger.


Comments

Post a Comment

Popular posts from this blog

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null
Read more

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops',
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens
Read more