用汇编语言8086 统计以$结尾的字符串STRING的字符个数
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code segment
assume cs:code
org 100h
start: jmp bbb
str1 db '1234567890123456789','$'
bbb: push cs
pop ds
push cs
pop es
lea si,str1
mov cx,3fffh
cld
@1:
lodsb
cmp al,'$'
je @2
loop @1
@2:
mov ax,3fffh
sub ax,cx
call dispaxs
mov ah,4ch
int 21h
;=========================================
DISPAXS PROC NEAR
PUSH AX
PUSH BX
PUSH CX
PUSH DX
PUSH SI
PUSH DI
PUSH BP
PUSH DS
PUSH ES
PUSHF
PUSH CS
POP DS
PUSH CS
POP ES
MOV CX,6
LEA DI,DISPAXSS
@DISPAXS:
MOV BYTE PTR [DI],32
INC DI
LOOP @DISPAXS
PUSH AX
MOV DL,32
MOV AH,2
INT 21H
POP AX
MOV BYTE PTR NZS,0
MOV BYTE PTR SIGNS,0
CMP AX,0
JGE @DISPAXS0
MOV BYTE PTR SIGNS,1
NEG AX
@DISPAXS0:
PUSH AX
LEA 灶滑耐 SI,DIVARRS
LEA DI,DISPAXSS
INC DI
MOV CX,5
@DISPAXS1:
POP AX
MOV DX,0
MOV BX,[SI]
DIV BX
PUSH DX
CMP AL,0
JNE @DISPAXS2
CMP BYTE PTR NZS,1
JE @DISPAXS2
CMP CX,1
JE @DISPAXS2
MOV DL,20H
JMP @DISPAXS3
@DISPAXS2:
ADD AL,30H
MOV DL,AL
MOV BYTE PTR NZS,1
@DISPAXS3:
MOV BYTE PTR[DI],DL
INC SI
INC SI
INC DI
LOOP @DISPAXS1
POP DX
CMP BYTE PTR SIGNS,1
JNE @DISPAXS6
LEA SI,DISPAXSS
ADD SI,5
@DISPAXS4:
CMP BYTE PTR [SI],32
JE @DISPAXS5
DEC SI
JMP @DISPAXS4
@DISPAXS5:
MOV BYTE PTR [SI],'-'
@DISPAXS6:
LEA DX,DISPAXSS
MOV AH,9
INT 21H
POPF
POP ES
POP DS
POP BP
POP DI
POP SI
POP DX
POP CX
POP BX
让败 POP AX
隐春 RET
DIVARRS DW 10000,1000,100,10,1
NZS DB 0
SIGNS DB 0
DISPAXSS DB 32,32,32,32,32,32,'$'
DISPAXS ENDP
;==================================
code ends
end start
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