已通过使用前面做的show_str子程序将转化结果输出：

;名称：letterc
;功能：将以0结尾的字符串中的小写字母转变成大写字母
;参数：ds:si指向字符串首地址

letterc:
                push cx
                push si                                ;保存寄存器状态
lc:
                mov cl,[si]
                jcxz endlc                        ;遇0则退出循环
                
                cmp cl,61h
                jb next                                ;小于'a'的字符不处理
                cmp cl,7ah
                ja next                                ;大于'z'的字符不处理
                and cl,11011111b
                mov [si],...

assume cs:code

data segment
db '1975',0,'1976',0,'1977',0,'1978',0,'1979',0,'1980',0,'1981',0,'1982',0,'1983',0
db '1984',0,'1985',0,'1986',0,'1987',0,'1988',0,'1989',0,'1990',0,'1991',0,'1992',0
db '1993',0,'1994',0,'1995',0
;以上是表示21年的21个字符串
dd 16,22,382,1356,2390,8000,16000,24486,50065,974...

;名称：dtoc
;功能：将dword型数据转变为表示十进制数的字符串，字符串以0为结尾符
;参数：(ax)=dword型数据的低16位
;                (dx)=dword型数据的高16位
;                ds:si指向字符串的首地址
;返回：无
dtoc:
                                                        ;保存寄存器状态
                push ax
                push bx
                push cx
                push dx
                push si
                push di
                
                mov di,0                        ;初始化字符个数计数器
divdword:
                mov cx,10                        ;将除数10写入cx
                call divdw                        ;调用除法子程...

子程序如下：
;名称：dtoc
;功能：将word型数据转变为表示十进制数的字符串，字符串以0为结尾符
;参数：(ax)=word型数据
;                ds:si指向字符串的首地址
;返回：无
dtoc:
                                        ;保存寄存器状态
                push ax
                push bx
                push cx
                push dx
                push si
                push di
                
                mov bx,10                ;将除数10写入bx
                mov di,0                ;初始化字符个数计数器
divdw:
                mov dx,0
                div bx                        ;做除法
                add dx,30h                ;余数加30h ...

divdw:
                                ;保存寄存器状态
                push si
                push di

                mov si,ax        ;被除数低位保存进si
                mov ax,dx        ;被除数高位送ax
                mov dx,0
                div cx                ;高位除法

                mov di,ax        ;将高位的商保存进di
                mov ax,si        ;被除数低位送ax
                div cx                ;低位除法
                mov cx,dx        ;余数送cx
                mov dx,di        ;高位商送dx
                
                                ;恢复寄存器状态
                pop di
                pop si
                ret...

show_str:
;保存当前寄存器状态
                push ax
                push bx
                push cx
                push es
                push si
                
;设置es位置
                mov ax,0b800h
                mov es,ax
                                
;计算当前行列的位置
                mov al,0a0h
                mul dh
                mov bx,ax
                
                mov al,2h
                mul dl
                add bx,ax
                
;记录颜色设置
                mov ah,cl
                
;循环显示字符
show_char:
;若cx为零，则显示结束
                mov cl,[si]
                m...

assume cs:codesg

data segment
;待显示的文字
db 'welcome to masm!'
;文字属性
db 00000010b,00100100b,01110001b
data ends

codesg segment
start:
        mov ax,0b800h
        mov ds,ax
        mov ax,data
        mov es,ax
        mov bx,71eh
        mov cx,3h
        mov bp,10h
;行循环
colum:        
        mov dx,cx
        mov cx,10h
        mov si,0
        mov di,0
;...

assume cs:codesg

data segment
db '1975','1976','1977','1978','1979','1980','1981','1982','1983'
db '1984','1985','1986','1987','1988','1989','1990','1991','1992'
db '1993','1994','1995'
;以上是表示21年的21个字符串
dd 16,22,382,1356,2390,8000,16000,24486,50065,97479,140417,197514
dd 345980,590827,80353...