的是16进制数。
执行时，态慧哗需在文件名后直接跟上计算表达式，如在命令碧慧提示符下执行结果如下：
c:\masm>js 3+2
5
c:\masm>js 6*7
2A
c:\masm>js 10-4
c
c:\masm>js 12/3
6
B_P EQU BYTE PTR
W_P EQU WORD PTR
D_P EQU DWORD PTR
CODESEGMENT
ASSUME CS:CODE,DS:CODE
ORG 100H
主程序开始
NEWSTAR:
JMP STAR
EVEN
NUM1DW 0,0
NUM2DW 0,0
NUM3DW 0,0
JGV4DW 0,0
YSF LABEL WORD
YSF1DB 0
YSF2DB 0
JUV DB 0
UV DB 0
使DS:SI指向第一有效字符
OVERS LABEL NEAR
CLD
PUSH AX
OVERS1:
LODSB
CMP AL,' '
JZ OVERS1
CMP AL,9
JZ OVERS1
DEC SI
CMP AL,13
POP AX
RET
输出一个制表符
TAB LABEL NEAR
MOV AL,9
JMP SHORT DISP
输出一个回车换行符
CRLFLABEL NEAR
MOV AL,13
CALL DISP
MOV AL,10
显示一个字符
DISPLABEL NEAR
PUSH AX
PUSH DX
MOV AH,2
MOV DL,AL
INT 21H
POP DX
POP AX
RET
检查是否为运算符
ISYSF LABEL NEAR
CLD
LODSB
CALL ISJJ
JZ ISYSF1
CALL ISII
JZ ISYSF1
DEC SI
ISYSF1:
RET
检查是否是加减运算
ISJJLABEL NEAR
CMP AL,'+'
JZ ISYSF1
CMP AL,'-'
RET
检查是否为乘除运算
ISIILABEL NEAR
CMP AL,'*'
JZ ISYSF1
CMP AL,'/'
JZ ISYSF1
CMP AL,'\'
RET
数据输出
CX=10 十进制
CX=16 十六进制
DOUTLABEL NEAR
PUSH AX
PUSH BX
PUSH DX
PUSH BP
XOR BP,BP
DOUT1:
INC BP
PUSH AX
MOV AX,DX
XOR DX,DX
DIV CX
MOV BX,AX
POP AX
DIV CX
PUSH DX
MOV DX,BX
OR BX,AX
JNZ DOUT1
DOUT2:
POP AX
ADD AL,'0'
CMP AL,'9'
JBE DOUT3
ADD AL,'A'-'9'-1
DOUT3:
CALL DISP
DEC BP
JNZ DOUT2
POP BP
POP DX
POP BX
POP AX
RET
输入数据在DX:AX中返回
CX=0 数据为10进制
CX#0 数据为16进制
DATELABEL NEAR
PUSH BX
PUSH BP
PUSH DI
XOR AX,AX
XOR DX,DX
DATE1:
MOV DI,AX
LODSB
CMP AL,'0'
JB DATE7
CMP AL,'帆行9'
JA DATE6
DATE2:
AND AX,0FH
SHL DI,1
RCL DX,1
MOV BX,DI
MOV BP,DX
SHL DI,1
RCL DX,1
SHL DI,1
RCL DX,1
JCXZ DATE3
SHL DI,1
RCL DX,1
Jmp short DATE4
DATE3:
ADD DI,BX
ADC DX,BP
DATE4:
ADD AX,DI
ADC DX,0
JMP DATE1
DATE5:
ADD AL,9
JMP DATE2
DATE6:
JCXZ DATE7
CMP AL,'A'
JB DATE7
CMP AL,'F'
JBE DATE5
CMP AL,'a'
JB DATE7
CMP AL,'f'
JBE DATE5
DATE7:
MOV AX,DI
DEC SI
OR DI,DX
POP DI
POP BP
POP BX
RET
数据1与数据2根据YSF1进行加减运算
JSJJLABEL NEAR
MOV AX,NUM2
MOV DX,NUM2+2
CMP YSF1,'+'
JZ JSJJ1
SUB NUM1,AX
SBB NUM1+2,DX
JMP SHORT JSJJ2
JSJJ1:
ADD NUM1,AX
ADC NUM1+2,DX
JSJJ2:
RET
数据1与数据2根据YSF1进行乘除运算
JSII1 LABEL NEAR
MOV BX,OFFSET NUM1
JMP SHORT JSII2_1
数据2与数据3根据YSF2进行乘除运算
JSII2 LABEL NEAR
MOV BX,OFFSET NUM2
JSII2_1:
DB 66H
MOV AX,[BX]
DB 66H
MOV CX,[BX+4]
CMP YSF2,'*'
JNZ JSII2_2
DB 66H
IMUL CX
JMP SHORT JSII2_3
JSII2_2:
DB 66H
CWD
DB 66H
IDIV CX
CMP YSF2,'/'
JZ JSII2_3
DB 66H
XCHG DX,AX
JSII2_3:
DB 66H
MOV [BX],AX
RET
显示结果
XUJGLABEL NEAR
MOV AX,JGV4
MOV DX,JGV4+2
MOV CX,10
CMP UV,10
JZ XUJG0
MOV CX,16
XUJG0:
TEST DX,8000H
JZ XUJG1
CMP UV,10
JZ XUJG2
CALL DOUT
XUJG2:
NOT AX
NOT DX
ADD AX,1
ADC DX,0
PUSH AX
CMP UV,10
JZ XUJG3
MOV AL,' '
CALL DISP
MOV AL,'('
CALL DISP
XUJG3:
MOV AL,'-'
CALL DISP
POP AX
CMP UV,10
JZ XUJG1
CALL DOUT
MOV AL,')'
CALL DISP
RET
XUJG1:
CALL DOUT
RET
计算结果放入DX:AX中
JSJGLABEL NEAR
CALL JSJJ
MOV AX,NUM1
MOV DX,NUM1+2
RET
从DS:SI处取一个数据
LOADATE LABEL NEAR
LODSB
CMP AL,'('
JZ LOADATE1
DEC SI
PUSH CX
XOR CX,CX
CMP UV,10
JZ LOADATE0
INC CX 取16进制数
LOADATE0:
CALL DATE 取数据放入DX:AX中
POP CX
RET
LOADATE1:
PUSH NUM1 保存数据1数据2及运算符
PUSH NUM1+2
PUSH NUM2
PUSH NUM2+2
PUSH YSF
INC JUV
MOV JGV4,0 结果值清零
MOV JGV4+2,0
进行四则运算
SZYSLABEL NEAR
CALL ISYSF 首字符是运算符？
JZ SZYS2
CALL LOADATE不是，取数并保存
MOV NUM1,AX
MOV NUM1+2,DX
SZYS1:
XOR AX,AX 数据2清零
MOV NUM2,AX
MOV NUM2+2,AX
CALL ISYSF 下个是运算符？
JZ SZYS3
JNZ SZYS6
SZYS2:
PUSH AX
MOV AX,JGV4 将结果作为数据1
MOV NUM1,AX
MOV AX,JGV4+2
MOV NUM1+2,AX
POP AX
SZYS3:
MOV YSF1,AL
MOV YSF2,AL
CALL ISJJ 是加减运算转
JZ SZYS4
CALL LOADATE取数据2
MOV NUM2,AX
MOV NUM2+2,DX
CALL JSII1 数据1与数据2根据YSF1进行乘除运算
JMP SZYS1 结果保存在数据1中
SZYS4:
CALL LOADATE取数据2并保存
MOV NUM2,AX
MOV NUM2+2,DX
SZYS4_1:
CALL ISYSF
JNZ SZYS6
CALL ISJJ 运算符2是加减运算？
JNZ SZYS5 不是转
PUSH AX
CALL JSJJ 数据1与数据2根据YSF1进行加减运算
POP AX 结果保存在数据1中
MOV YSF1,AL 保存新的运算符
JMP SZYS4
SZYS5:
MOV YSF2,AL 保存运算符2
CALL LOADATE取数据3
MOV NUM3,AX
MOV NUM3+2,DX
CALL JSII2 数据2与数据3根据YSF2进行乘除运算
JMP SZYS4_1结果保存在数据2中
SZYS6:
MOV CL,AL
CMP AL,13
JNZ SZYS9
SZYS7:
CALL JSJG
CMP JUV,0
JZ SZYS8
DEC JUV
POP YSF
POP NUM2+2
POP NUM2
POP NUM1+2
POP NUM1
RET
SZYS8:
CMP CL,')'
JZ SZYS10
MOV JGV4,AX
MOV JGV4+2,DX
JNZ SZYS12
SZYS9:
CMP AL,')'
JNZ SZYS11
INC SI
JMP SZYS7
SZYS10:
MOV NUM1,AX
MOV NUM1+2,DX
JMP SZYS1
SZYS11:
STC
RET
SZYS12:
CLC
RET
数制处理
UVILLABEL NEAR
PUSH SI
UVIL1:
LODSB
CMP AL,' '
JZ UVIL2
CMP AL,9
JZ UVIL2
CMP AL,13
JZ UVIL4
JNZ UVIL1
UVIL2:
MOV BX,SI
CALL OVERS
JZ UVIL3
LODSW
CALL OVERS
POP SI
JNZ SZYS11
CMP AX,'01'
JNZ SZYS11
PUSH SI
MOV UV,10
UVIL3:
MOV AL,13
MOV [BX-1],AL
UVIL4:
POP SI
CLC
RET
预置结果
YVJGLABEL NEAR
MOV AH,52H
INT 21H
MOV AX,ES:[BX-2]
MOV DS,AX
MOV AX,DS:[0CH]
MOV CS:JGV4,AX
MOV AX,DS:[0EH]
MOV CS:JGV4+2,AX
PUSH CS
POP DS
PUSH CS
POP ES
RET
保存结果
BCJGLABEL NEAR
MOV AH,52H
INT 21H
MOV AX,ES:[BX-2]
MOV DS,AX
MOV AX,CS:JGV4
MOV DS:[0CH],AX
MOV AX,CS:JGV4+2
MOV DS:[0EH],AX
PUSH CS
POP DS
PUSH CS
POP ES
RET
STAR:
MOV SI,81H
CLD
CALL OVERS
JNZ STAR1
STAR0:
MOV DX,OFFSET MESS1
JMP STAR4
STAR1:
CALL YVJG
CALL UVIL
JB STAR0
MOV SAVESP,SP
CALL SZYS
MOV SP,SAVESP
MOV DX,OFFSET MESS2
JB STAR4
CALL CRLF
CALL XUJG
CALL BCJG
MOV DX,OFFSET MESS3
STAR4:
MOV AH,9
INT 21H
INT 20H
SAVESP DW 0
MESS1 DB 13,10,' Syntax:',13,10
DB ' JS <Expression> [10]',13,10,'$'
MESS2 DB 'Error in expression !$'
MESS3 DB 13,10,'$'
CODEENDS
END NEWSTAR
CODE SEGMENTASSUME CS:CODE
MAIN PROC FAR
START:
mov cx,5
mov si,cx
LOOP1:
MOV CX,SI
MOV BX,0
GET_CHAR0:MOV AH,1
INT 21H
CMP AL,0DH
JE T0
枯羡数 SUB AL,30H
JL T0
CMP AL,9
JG T0
CBW
XCHG AX,BX
MOV CX,10
MUL CX
XCHG AX,BX
ADD BX,AX
JMP GET_CHAR0
T0:ADD AL,30H
CMP AL,2BH
JE JIA
CMP AL,2DH
JE JIAN
派碧 CMP AL,2AH
JE CHENG
CMP AL,2FH
JE CHU
JMP EXIT0
JIA:MOV DI,BX
CALL JIAFA
JMP EXIT0
JIAN:MOV DI,BX
CALL JIANFA
JMP EXIT0
CHENG:MOV DI,BX
CALL CHENGFA
JMP EXIT0
CHU:MOV DI,BX
CALL CHUFA
EXIT0:CALL SHUCHU
MOV DL,0AH
MOV AH,2
INT 21H
DEC SI
MOV CX,SI
LOOP LOOP1
MOV AH,4CH
INT 21H
RET
MAIN ENDP
shuru PROC NEAR
MOV BX,0
GET_CHAR:MOV AH,1
INT 21H
CMP AL,0DH
JE EXIT
SUB AL,30H
JL EXIT
CMP AL,9
JG EXIT
CBW
XCHG AX,BX
MOV CX,10
MUL CX
XCHG AX,BX
ADD BX,AX
JMP GET_CHAR
EXIT:
RET
shuru ENDP
JIAFA PROC NEAR
CALL SHURU
ADD BX,DI
RET
JIAFA ENDP
JIANFA PROC NEAR
CALL SHURU
MOV AX,DI
SUB AX,BX
MOV BX,AX
RET
JIANFA ENDP
CHENGFA PROC NEAR
CALL SHURU
MOV AL,BL
MOV BX,DI
MUL BL
MOV BX,AX
RET
CHENGFA ENDP
CHUFA PROC NEAR
CALL SHURU
MOV AX,DI
SUB AH,AH
DIV BL
MOV BL,AL
RET
CHUFA ENDP
shuchu PROC NEAR
MOV CX,1000
CALL DEC_DIV
MOV CX,100
CALL DEC_DIV
MOV CX,10
CALL DEC_DIV
MOV CX,1
CALL DEC_DIV
RET
shuchu ENDP
DEC_DIV PROC NEAR
MOV AX,BX
MOV DX,0
DIV CX
MOV BX,DX
CMP AL,9
ADD AL,30H
MOV DL,AL
MOV AH,2
INT 21H
RET
DEC_DIV ENDP
CODE ENDS
END START
此程序会循没首环四次，输入四次后自动退出。
可以输入加减乘除。
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