data segment
mess1 db ' student grade management system',0ah,0dh,'$'
mess2 db ' this is main menu',0ah,0dh,'$'
mess3 db ' insert (i) please input:',0ah,0dh,'$'
mess4 db ' modify (m) name :',0ah,0dh,'$'
mess5 db ' delete (d) maths :',0ah,0dh,'$'
mess6 db ' query (q) english :',0ah,0dh,'$'
mess7 db ' count (c) computer:',0ah,0dh,'$'
mess8 db ' print (p) chinese :',0ah,0dh,'$'
mess9 db ' exit (e)',0ah,0dh,'$'
mess10 db '**********************************************************$'
mess11 db 'name Ma En Co Ch',0ah,0dh,'$'
mess13 db ' list (l)',0ah,0dh,'$'
mess12 db 'maths <60 <70 <80 <90 <100',0ah,0dh,'$'
err1 db ' there is not this student$'
err2 db ' file close wrong$'

fname db "e:\hbyy\score.txt"

buffer1 db 23 dup(?)
buffeer db 0ah,0dh,'$'
buffer2 db 30 dup(?)
buffer3 db 8 dup('0')
count db 5
handle dw ?
del db 8 dup('0')
x db ?
data ends

score struc
names db 15 dup(' ')
maths db 0,0
english db 0,0
computer db 0,0
chinese db 0,0
score ends

show macro addrs
lea dx,addrs
mov ah,9
int 21h
endm

set_p1 macro a
mov ah,2
mov dh,a
mov dl,36
mov bh,0
int 10h
endm

set_p2 macro
mov ah,2
mov dh,12
mov dl,2
mov bh,0
int 10h
endm
set_p3 macro
mov ah,2
mov dh,1
mov dl,30
mov bh,0
int 10h
endm

clear macro ;all screen
mov al,0
mov cl,0
mov ch,0
mov dh,24
mov dl,79
mov bh,7
mov ah,6
int 21h
endm

clear1 macro ;lefe screen
mov al,0
mov bh,7
mov ch,4
mov cl,36
mov dh,10
mov dl,79
mov ah,6
int 10h
endm

clear2 macro ;down screen
mov al,0
mov bh,7
mov ch,12
mov cl,0
mov dh,24
mov dl,79
int 10h
endm

newline macro
push ax
push dx
mov dl,0dh
mov ah,2
int 21h
mov dl,0ah
mov ah,2
int 21h
pop dx
pop ax
endm

show_item macro addrs
local iloop,w10
push bx
push cx
mov bx,0
iloop: mov dl,addrs[bx] ;display char
mov ah,2
int 21h
inc bx
cmp bx,15
jl iloop
mov cx,4
w10: mov dl,' '
mov ah,2
int 21h
mov dl,' '
mov ah,2
int 21h
mov dl,' '
mov ah,2
int 21h

mov dl,addrs[bx]
mov ah,2
int 21h
inc bx
mov dl,addrs[bx]
mov ah,2
int 21h
inc bx
loop w10
newline
pop cx
pop bx
endm

getin macro addrs,count2
local zeroit,lp,input_end,exit
push bx
push ax
mov bx,0
zeroit: mov addrs[bx],' '
inc bx
cmp bx,15
jl zeroit

mov bx,0
lp: mov ah,1
int 21h
cmp al,0ah
jz input_end
cmp al,0dh
jz input_end
mov addrs[bx],al
inc bx
cmp bx,count2
jl lp
input_end: cmp al,0dh
jz exit
cmp al,0ah
jz exit
mov ah,7
int 21h
jmp input_end
exit:
pop ax
pop bx
endm

code segment
main proc far
assume cs:code,ds:data,es:data

start:
mov ax,data
mov ds,ax
mov ah,0
mov al,3
int 10h

clear
show mess1
show mess2
show mess13
show mess3
show mess4
show mess5
show mess6
show mess7
show mess8
show mess9
newline
show mess10
set_p3
w: mov ah,7
int 21h
cmp al,'i'
jnz n1
call insert
jmp w
n1: cmp al,'m'
jnz n2
call modify
jmp w
n2: cmp al,'d'
jnz n3
call delete
jmp w
n3: cmp al,'q'
jnz n4
call query
jmp w
n4: cmp al,'c'
jnz n5
call cot
jmp w
n5: cmp al,'p'
jnz n6
call print
jmp w
n6: cmp al,'l'
jnz n7
call list
jmp w
n7: cmp al,'e'
jz exitf
jmp w
exitf:
mov ah,4ch
int 21h
ret
main endp

insert proc near
push ax
push bx
push cx
push dx

mov dx,offset fname
mov al,2
mov ah,3dh
int 21h
mov bx,ax
clear1
set_p1 4
call get_rec
mov cx,0 ;move file pointer to end
mov dx,0
mov al,2
mov ah,42h
int 21h

mov cx,23 ;write file
mov dx,offset buffer1
mov ah,40h
int 21h
mov ah,3eh
int 21h
set_p3
pop dx
pop cx
pop bx
pop ax
ret
insert endp

get_rec proc near
push ax
push bx
getin buffer2,15
mov bx,0
mov cx,15
continue: mov al,buffer2[bx]
mov buffer1[bx],al
inc bx
loop continue
set_p1 5
getin buffer2,2
mov al,buffer2
mov buffer1[bx],al
inc bx
mov al,buffer2+1
mov buffer1[bx],al
inc bx
set_p1 6
getin buffer2,2
mov al,buffer2
mov buffer1[bx],al
inc bx
mov al,buffer2+1
mov buffer1[bx],al
inc bx
set_p1 7
getin buffer2,2
mov al,buffer2
mov buffer1[bx],al
inc bx
mov al,buffer2+1
mov buffer1[bx],al
inc bx
set_p1 8
getin buffer2,2
mov al,buffer2
mov buffer1[bx],al
inc bx
mov al,buffer2+1
mov buffer1[bx],al
inc bx
pop bx
pop ax
ret
get_rec endp

openf proc near
mov dx,offset fname
mov al,02
mov ah,3dh
int 21h
mov handle,ax
ret
openf endp

query proc near
push ax
push bx
push cx
push dx
clear1
clear2
mov dx,offset fname
mov al,2
mov ah,3dh
int 21h
mov bx,ax
set_p2
getin buffer1,15
lea dx,mess11
mov ah,9
int 21h
b:
mov ah,3fh
mov cx,23
mov dx,offset buffer2
int 21h
lea si,buffer2
lea di,buffer1
mov cx,15
c:
mov al,byte ptr[si]
cmp al,byte ptr[di]
jnz b
inc si
inc di
loop c
mov [buffer2+23],'$'
show_item buffer2
mov ah,3eh
int 21h
pop dx
pop cx
pop bx
pop ax
ret
query endp

modify proc near
push ax
push bx
push cx
push dx
clear1
set_p1 4
mov dx,offset fname
mov al,2
mov ah,3dh
int 21h
mov bx,ax
mov handle,ax
call get_rec ; contact is in buffer1
read:
mov dx,offset buffer2
mov cx,23
mov ah,3fh
int 21h
lea si,buffer2
lea di,buffer1
mov cx,15
c5:
mov dl,byte ptr[si]
cmp dl,byte ptr[di]
jnz read
inc si
inc di
loop c5
mov bx,handle
mov ah,42h
mov al,1
mov cx,0ffffh
mov dx,-23
int 21h
mov cx,23
mov dx,offset buffer1
mov ah,40h
int 21h
mov ah,3eh
int 21h
jmp exit2
exit1:
set_p2
show err1
exit2:
set_p3
pop dx
pop cx
pop bx
pop ax
ret
modify endp

delete proc near
push ax
push bx
push cx
push dx
clear1
set_p1 4
mov dx,offset fname
mov al,2
mov ah,3dh
int 21h
mov bx,ax
mov handle,ax
getin buffer1,15 ; contact is in buffer1
read5:
mov dx,offset buffer2
mov cx,23
mov ah,3fh
int 21h
lea si,buffer2
lea di,buffer1
mov cx,15
c6:
mov dl,byte ptr[si]
cmp dl,byte ptr[di]
jnz read5
inc si
inc di
loop c6
mov bx,handle
mov ah,42h
mov al,1
mov cx,0ffffh
mov dx,-8
int 21h
mov cx,8
mov dx,offset del
mov ah,40h
int 21h
mov ah,3eh
int 21h
jmp exit6

exit5:
set_p2
show err1
exit6:
set_p3
pop dx
pop cx
pop bx
pop ax
ret
delete endp

list proc near
push ax
push bx
push cx
push dx

clear1
clear2
set_p2
show mess11
mov dx,offset fname
mov al,2
mov ah,3dh
int 21h
mov bx,ax
again:
mov dx,offset buffer1
mov cx,23
mov ah,3fh
int 21h
cmp ax,0
jz p
show_item buffer1
jmp again
p:
mov ah,3eh
int 21h
set_p3
pop dx
pop cx
pop bx
pop ax
ret
list endp

print proc near
push ax
call openf
mov cl,count
mov ch,0
read2:
mov dx,offset buffer1
mov cx,type score
mov ah,3fh
int 21h
mov cx,23h
mov bx,0
next: mov ah,5
mov dl,byte ptr buffer1[bx]
int 21h
inc bx
loop next
mov ah,5
mov dl,0dh
int 21h
dec x
cmp x,0
jnz read2
mov bx,handle
mov ah,3eh
int 21h
pop ax
ret
print endp

cot proc
push ax
clear2
set_p2
show mess12
mov dx,offset fname
mov ah,3dh
int 21h
mov bx,ax
mov handle,ax
read0: mov dx,offset buffer2
mov cx,23
mov ah,3fh
int 21h
mov dl,[buffer2+15]
cmp dl,'6'
jl five
cmp dl,'7'
jl six
cmp dl,'8'
jl seven
cmp dl,'9'
jl eight
inc [buffer3+4]
jmp quit
eight:
inc [buffer3+3]
jmp quit
seven: inc [buffer3+2]
jmp quit
six: inc [buffer3+1]
jmp quit
five: inc [buffer3]
quit: cmp ax,0
jnz read0
mov cx,10
a: mov dl,' '
mov ah,2
int 21h
loop a
mov bx,0
a0: mov dl,[buffer3+bx]
mov ah,2
int 21h
inc bx
mov dl,' '
mov ah,2
int 21h
mov dl,' '
mov ah,2
int 21h
cmp bx,5
jnz a0
mov bx,handle
mov ah,3eh
int 21h
set_p3
pop ax
ret
cot endp
code ends
end start

可以不啊