w502.lst

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Microsoft (R) Macro Assembler Version 6.00     		    10/27/03 11:13:27
w502.asm						     Page 1 - 1


				        ;教材循环控制伪指令示例


				        .model small
				        .stack
 0000				        .code
				        .startup
 0000			   *@Startup:
 0000  BA ---- R	   *	    mov    dx, DGROUP
 0003  8E DA		   *	    mov    ds, dx
 0005  8C D3		   *	    mov    bx, ss
 0007  2B DA		   *	    sub    bx, dx
 0009  D1 E3		   *	    shl    bx, 001h
 000B  D1 E3		   *	    shl    bx, 001h
 000D  D1 E3		   *	    shl    bx, 001h
 000F  D1 E3		   *	    shl    bx, 001h
 0011  FA		                     *	    cli    
 0012  8E D2		   *	    mov    ss, dx
 0014  03 E3		   *	    add    sp, bx
 0016  FB		                     *	    sti    

				;****************************
				;1－100求和，用＂当型循环＂
				;****************************

 0017  33 C0			        xor ax,ax
 0019  B9 0064			        mov cx,100
				        .while cx !=0
 001C  EB 03		   *	    jmp    @C0001       ；先去判断循环条件 
 001E			   *@C0002:
 001E  03 C1			           add ax,cx
 0020  49			                              dec cx
				        .endw
 0021			   *@C0001:
 0021  0B C9		   *	    or	cx, cx
 0023  75 F9		   *	    jne    @C0002
				;****************************
				;1--100求和，用＂直到型循环＂
				;****************************
 0025  33 C0			       xor ax,ax
 0027  B9 0064			       mov cx,100
				       .repeat
 002A			   *@C0004:
 002A  03 C1			          add ax,cx
 002C  49			                             dec cx
				       .until cx==0
 002D  0B C9		   *	    or	cx, cx
 002F  75 F9		   *	    jne    @C0004

				;+++++++++++++++++++++++++++++
				;1--100求和，用＂.untilcxz求和＂
				;+++++++++++++++++++++++++++++
 0031  33 C0			        xor ax,ax
 0033  B9 0064			        mov cx,100
				        .repeat
 0036			   *@C0006:
 0036  03 C1			           add ax,cx
				        .untilcxz
 0038  E2 FC		   *	    loop   @C0006
				;+++++++++++++++++++++++++++++++++++++++++
				;1--100求和，用＂.untilcxz＂,只求前95个数
				;+++++++++++++++++++++++++++++++++++++++++
 003A  33 C0			        xor ax,ax
 003C  B9 0064			        mov cx,100
				        .repeat
 003F			   *@C0007:
 003F  03 C1			          add ax,cx
				        .untilcxz ax==95
 0041  83 F8 5F		   *	    cmp    ax, 05Fh
 0044  E0 F9		   *	    loopne @C0007
				;--------------------------------------
				        .exit 0
 0046  B8 4C00		   *	    mov    ax, 04C00h
 0049  CD 21		   *	    int    021h
				        end
Microsoft (R) Macro Assembler Version 6.00     		    10/27/03 11:13:27
w502.asm						     Symbols 2 - 1




Segments and Groups:

                N a m e                 Size     Length   Align   Combine Class

DGROUP . . . . . . . . . . . . .	GROUP
_DATA  . . . . . . . . . . . . .	16 Bit	 0000	  Word	  Public  'DATA'	
STACK  . . . . . . . . . . . . .	16 Bit	 0400	  Para	  Stack	  'STACK'	 
_TEXT  . . . . . . . . . . . . .	16 Bit	 004B	  Word	  Public  'CODE'	


Symbols:

                N a m e                 Type     Value    Attr

@CodeSize  . . . . . . . . . . .	Number	 0000h	 
@DataSize  . . . . . . . . . . .	Number	 0000h	 
@Interface . . . . . . . . . . .	Number	 0000h	 
@Model . . . . . . . . . . . . .	Number	 0002h	 
@Startup . . . . . . . . . . . .	L Near	 0000	  _TEXT	
@code  . . . . . . . . . . . . .	Text   	 _TEXT
@data  . . . . . . . . . . . . .	Text   	 DGROUP
@fardata?  . . . . . . . . . . .	Text   	 FAR_BSS
@fardata . . . . . . . . . . . .	Text   	 FAR_DATA
@stack . . . . . . . . . . . . .	Text   	 DGROUP

	   0 Warnings
	   0 Errors