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lab4.asm
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lab4.asm
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assume cs: code, ds: data
data segment
dummy db 0Dh, 0Ah, '$'
str1 db 100, 99 dup ('$')
str2 db 100, 99 dup ('$')
str3 db 100, 99 dup ('0')
res db 100, 99 dup ('$')
strerr db "error$"
data ends
code segment
free proc ; очистка
xor ax, ax
xor bx, bx
xor cx, cx
xor dx, dx
xor si, si
xor di, di
ret
endp
print proc ; вывод на экран
mov si, dx
dec si
lea di, res+2
mov bh, 0
p:
mov bl, [si]
cmp bl, 48
jne nz
cmp bh, 1
je nz
jmp point
nz:
mov bh, 1
mov [di], bl
inc di
point:
dec si
mov al, [si]
cmp al, 36
jne p
cmp bh, 0
jne endprint
add bh, 48
mov [di], bh
inc di
endprint:
mov bl, 36
mov [di], bl
xor al, al
lea dx, res+2
mov ah, 09h
int 21h
mov dx, offset dummy
mov ah, 09h
int 21h
ret
endp
strinput proc ; ввод
mov ah, 0Ah
int 21h
mov dx, offset dummy
mov ah, 09h
int 21h
ret
strinput endp
convsub proc ; преобразование в число для вычитания
sub ax, 48
sub bx, 48
cmp bh, 1
jne noteq
cmp al, 20
jge erro
jmp contin
noteq:
cmp al, 10
jge erro
contin:
cmp bl, 10
jge erro
jmp return
erro:
mov ah, 9
mov dx, offset strerr
int 21h
enddd:
mov ax, 4C00h
int 21h
return:
ret
endp
convsum proc ; преобразование в число для сложения
sub al, 48
sub bl, 48
cmp al, 10
jge erro1
cmp bl, 10
jge erro1
jmp return1
erro1:
mov ah, 9
mov dx, offset strerr
int 21h
enddd1:
mov ax, 4C00h
int 21h
return1:
ret
endp
decsum proc ; перевод в десятичную для сложения
mov bl, 10
mov si, dx
div bl
add ah, 48
mov [si], ah
xor ah, ah
inc si
inc dx
cmp al, 0
je nextt
inc bh
nextt:
ret
decsum endp
decsub proc ; перевод в десятичную для вычитания
mov si, dx
add al, 48
mov [si], al
inc dx
ret
endp
summ proc
push bp
mov bp, sp
mov si, [bp+4]
mov di, [bp+6]
mov dl, [si]
mov cl, [di]
add si, dx
add di, cx
sub dx, cx
push dx
mov dx, [bp+8]
inc dx
l:
mov al, [si]
mov bl, [di]
call convsum
add al, bl
cmp bh, 0
je next
inc ax
xor bh, bh
next:
push si
call decsum
pop si
dec si
dec di
loop l
endproh:
pop cx
cmp cx, 0
je endbit
lp:
mov al, [si]
sub al, 48
push si
cmp bh, 0
je next1
inc ax
xor bh, bh
next1:
call decsum
pop si
dec si
loop lp
endbit:
cmp bh, 0
je next2
xor bh, bh
push si
call decsum
pop si
dec si
next2:
pop bp
ret
endp
subb proc
push bp
mov bp, sp
mov si, [bp+4]
mov di, [bp+6]
mov dl, [si]
mov cl, [di]
add si, dx
add di, cx
sub dx, cx
push dx
mov dx, [bp+8]
inc dx
passage:
mov al, [si]
mov bl, [di]
cmp bh, 1
jne nex
dec al
dec bh
nex:
cmp bl, al
jle norm
add al, 10
inc bh
call convsub
norm:
sub al, bl
push si
call decsub
pop si
dec si
dec di
loop passage
endpas:
pop cx
cmp cx, 0
je littlend
ll:
mov al, [si]
cmp bh, 1
jne nexx
dec al
dec bh
nexx:
cmp al, 47
jg normm
add al, 10
inc bh
normm:
sub al, 48
push si
call decsub
pop si
dec si
loop ll
littlend:
pop bp
ret
endp
decmul proc
mov bl, 10
mov si, dx
div bl
add ah, 48
mov [si], ah
xor ah, ah
inc dx
cmp al, 0
je nextt1
mov bh, al
nextt1:
ret
endp
resmul proc
mov si, dx
mov bh, [si]
sub bh, 48
add al, bh
mov bl, 10
div bl
add ah, 48
mov [si], ah
xor ah, ah
mov bh, al
inc dx
ret
endp
mull proc
push bp
mov bp, sp
mov si, [bp+4]
mov di, [bp+6]
mov cl, [si]
mov dl, [di]
cmp cl, 1
je zero
cmp dl, 1
je zero
jmp con
zero:
mov al, [si+1]
cmp al, 48
je zero1
mov bl, [di+1]
cmp bl, 48
je zero1
jmp con
zero1:
mov dx, [bp+8]
inc dx
mov al, 48
mov si, dx
mov [si], al
inc dx
pop bp
ret
con:
mov ax, dx
add si, cx
add di, dx
push si
dec al
mov dx, [bp+8]
inc dx
push dx
push ax
push cx
beg:
mov al, [si]
mov bl, [di]
call convsum
mul bl
cmp bh, 0
je eqq
add al, bh
xor bh, bh
eqq:
push si
call decmul
pop si
dec si
loop beg
mov si, dx
add bh, 48
mov [si], bh
xor bh, bh
inc dx
pop bx
pop ax
push ax
push bx
cmp al, 0
je end1
firstCicle:
pop cx
pop ax
pop dx
inc dx
pop si
push si
push dx
push ax
push cx
dec di
scndCicle:
mov al, [si]
mov bl, [di]
call convsum
mul bl
add al, bh
xor bh, bh
push si
call resmul
pop si
dec si
loop scndCicle
pop ax
pop cx
dec cx
push cx
inc cx
push ax
loop firstCicle
mov si, dx
cmp bh, 0
je end1
add bh, 48
mov [si], bh
inc dx
end1:
pop ax
pop bx
pop di
pop si
pop bp
ret
endp
start:
mov ax, data
mov ds, ax
mov ax, 0
lea dx, str1
call strinput
lea dx, str2
call strinput
xor ax, ax
lea si, str3+2
mov [str3+2], 36
push si
lea si, str2+1
push si
lea si, str1+1
push si
call mull ; произведение беззнаковых чисел
call print
call free ; очистка регистров
call subb ; разность беззнаковых чисел (первое число больше второго)
call print
call free
call summ ; сумма беззнаковых (второе число не диннее первого)
call print
call free
mov ax, 4C00h
int 21h
code ends
end start