exam.asm

用汇编语言做的一些小程序例题

data segment
jump_table dw sub1,sub2,sub3,sub4,sub5
param  db 3
data ends

stack1 segment para stack 'stack1'
sd dw 20h dup(?)
stack1 ends

code segment
assume cs:code,ds:data,ss:stack1
being  proc far
push ds
mov ax,0
push ax   

mov ax,data
mov ds,ax


xor ax,ax
mov al,param
dec ax
shl ax,1
mov bx,offset jump_table
add bx,ax
mov ax,[bx]
jmp ax

sub1: mov dl,'1'
mov ah,02h
int 21h
jmp end0

sub2: mov dl,'2'
mov ah,02h
int 21h
jmp end0

sub3: mov dl,'3'
mov ah,02h
int 21h
jmp end0

sub4: mov dl,'4'
mov ah,02h
int 21h
jmp end0

sub5: mov dl,'5'
mov ah,02h
int 21h

end0: mov ah,4ch
      int 21h

code ends
end being