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汇编程序:求两个正整数的最大公约数

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CRLF MACRO

MOV AH,02H

MOV DL,0DH

INT 21H

MOV AH,02H

MOV DL,0AH

INT 21H

ENDM

data segment

M dw 8

N DW 16

result dw 0

y dw 10

output1 dw 0

K dw 0

s1 db \"Please input a number as 'M': s2 db \"Please input a number as 'N': s3 db \"The result is : $\"

data ends

stack segment

s dw 1000 dup(?)

stack ends

code segment

assume cs:code,ds:data,ss:stack

$\"

$\"

start:

push ds

mov ax,0

push ax

mov ax,data

mov ds,ax

lea dx,s1

mov ah,09h

int 21h

call intput

mov ax,K

mov M,ax

mov K,0

crlf

lea dx,s2

mov ah,09h

int 21h

call intput

mov ax,K

mov N,ax

mov K,0

crlf

call ouji

mov ax,result

mov output1,ax

lea dx,s3

mov ah,09h

int 21h

call output

mov output1,0

ret

ouji proc near

xor dx,dx

mov ax,m

mov bx,n

T: cmp ax,bx

jge U

xchg ax,bx

U: mov cx,ax

div bx

cmp dx,0

jnz G

mov result,bx

jmp NEXT

G: mov ax,dx

xor dx,dx

jmp T

NEXT: ret

ouji endp

intput proc near

in_1: mov ah,01h

int 21h

xor ah,ah

cmp ax,0dh

je in_out

cmp ax,30h

jb in_out

cmp ax,39h

jG in_out

sub ax,30h

mov di,ax

mov ax,K

mul y

mov K,ax

add K,di

loop in_1

in_out:ret

intput endp

output proc near

mov ax,output1

xor dx,dx

mov di,0

p1: div y

push dx

inc di

xor dx,dx

cmp ax,10

jb output_n1

jmp p1

output_n1: cmp ax,0

jz output_n2

push ax

inc di

output_n2: mov cx,di

p2: pop dx

add dx,30h

mov ah,02h

int 21h

loop p2

mov ah,4ch

int 21h

output endp

code ends

end start

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