datasegment
string1db'Pleaseinputanumber:',0dh,0ah,'$'
string2db0dh,0ah,'number!',0dh,0ah,'$'
string3db0dh,0ah,'char',0dh,0ah,'$'
string4db0dh,0ah,'other',0dh,0ah,'$'
dataends
codesegment
assumecs:code,ds:data
start:
movax,data
movds,ax
S:
leadx,string1;将string1的偏移地址放到dx中，使dx指向string1
movah,09h;在光标位置显示字符串,DS:DX=串地址，用’$’结束字符串
int21h
movah,01h;置光标位置，键盘输入并回显,AL=输入字符
int21h
cmpal,30h
jncnumber2;大于或等于时转移
jmpoutputother
number2:
cmpal,3ah
jncnotnum
leadx,string2
movah,09h
int21h
jmpS
notnum:
cmpal,41h;判断是否为大写字符
jncchar
jmpoutputother
char:cmpal,5bh;与大写字符“Z”的下一个比较
jncsmallchar;转到判断小写字符处
leadx,string3
movah,09h
int21h
jmpS
smallchar:
cmpal,62h;与小写字符'a'的下一个比较
jncsmallchar2;高于则转移
jmpoutputother
smallchar2:cmpal,7bh
jncoutputother
leadx,string3
movah,09h
int21h
jmpS
outputother:leadx,string4
movah,09h;显示字符串,DS:DX=串地址’$’结束字符串
int21h
jmpEXIT
EXIT:
movah,4ch
int21h
codeends
endstart
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