用80x86汇编语言编程：1 + 2 + 3 + 4 + 5 + …… + n，和小于100，在屏幕上显示次数和结果。

;==============================================

;1+...+n < 100

;----------------------------------------------

DATA SEGMENT ;数据段

i DW 1

sum DW 0

DATA ENDS

;----------------------------------------------

CODE SEGMENT ;代码段

ASSUME CS: CODE, DS: DATA

START:

PUSH CS

POP DS

MOV i, 1

MOV sum, 0

LOP:

MOV AX, sum

ADD AX, i

CMP AX, 100

JNB EXIT

MOV sum, AX

MOV AX, i

CALL PRINTAX

MOV DL, ':'

CALL PUTC

MOV DL, ' '

CALL PUTC

MOV AX, sum

CALL PRINTAX

INC i

CALL OUT_0D0A

JMP LOP

EXIT:

MOV AH, 4CH

INT 21H

;------------------------------

PRINTAX PROC ;

MOV BX, 10 ;

OR AX, AX

JZ _0_

LOOP_P:

XOR DX, DX

DIV BX

MOV CX, AX ;

OR CX, DX

JZ _E_ ;

PUSH DX ;

CALL LOOP_P

POP DX ;

ADD DL, '0' ;

JMP _1_

_0_:MOV DL, '0' ;

_1_:CALL PUTC

_E_:RET

PRINTAX ENDP

;------------------------------

PUTC PROC

MOV AH, 2

INT 21H

RET

PUTC ENDP

;------------------------------

OUT_0D0A PROC ;回车换行.

MOV DL, 13

CALL PUTC

MOV DL, 10

CALL PUTC

RET

OUT_0D0A ENDP

;------------------------------

CODE ENDS

END START

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