DATAS SEGMENT
    grade dw 10dup(?)
    avg dw 0
DATAS ENDS

STACKS SEGMENT
    ;此处输入堆栈段代码
STACKS ENDS

CODES SEGMENT
    ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
    MOV AX,DATAS
    MOV DS,AX
    mov bx,0
newchar:mov ah,1
        int 21h
        sub al,30h
        jl exit        ;<0退出
        cmp al,9
        jg exit        ;>9退出
        cbw
        xchg ax,bx
        mov cx,10
        mul cx
        add bx,ax
        jmp newchar
exit:   
        
        mov ah,2
        int 21h

    MOV AH,4CH
    INT 21H
CODES ENDS
    END START

2017-5-7注册,只发一帖
这不是补充,而是直接找人代做功课吧.
况且一楼的代码不似专为题目而写,倒像别的地方抓来的.