汇编语言算术运算指令.ppt

1、算术运算指令,ADD/INC SUB/DEC/CMP 比较指令 JC/JNC JZ/JNZ,将20H放入地址为30000开始的100个单元,CODE SEGMENT ASSUME CS:CODE START:MOV AX,3000H MOV DS,AX MOV BX,00H MOV CX,100 MOV AL,20H NEXT:MOV BX,AL INC BX DEC CX JNZ NEXT INT 3H CODE ENDS ENDSTART,CODE SEGMENT ASSUME CS:CODE START:MOV AX,3000H MOV DS,AX MOV BX,00H MOV CX,1

2、00 NEXT:MOV BYTE PTRBX,20H INC BX CMP BX,100 JNZ NEXT INT 3H CODE ENDS ENDSTART,已知内存变量KEY中存放着0-9的ASCII码将其转换为其数值存入内存变量TMP中,DATA SEGMENT KEY DB 30H,31H,32H,33H,34H,35H,36H,37H,38H,39H TMP DB 10 DUP(?) DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX LEA SI,KEY LEA DI,TMP MOV C

3、X,10 NEXT:MOV AL,SI SUB AL,30H MOV DI,AL INC SI INC DI DEC CX JNZ NEXT INT 3H CODEENDS ENDSTART,已知内存变量KEY中存放着0-9H转换为ASCII码存入内存变量TMP中,DATA SEGMENT KEY DB 0H,1H,2H,3H,4H,5H,6H,7H,8H,9H TMP DB 10 DUP(?) DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX LEA SI,KEY LEA DI,TMP MOV

4、CX,10 NEXT:MOV AL,SI ADD AL,30H MOV DI,AL INC SI INC DI DEC CX JNZ NEXT INT 3H CODEENDS ENDSTART,将内存变量KEY中存放着（0-9H）之间的任意5个数字按下表加密转换存入内存变量TMP中,将内存变量KEY中存放着（0-9H）之间的任意5个数字按下表加密转换存入内存变量TMP中,DATA SEGMENT KEY DB 2H,7H,9H,8H,3H TAB DB 1H,3H,7H,2H,4H,6H,0BH,0DH,0FH,0H TMP DB 5 DUP(?) DATA ENDS CODE SEGMENT

5、 ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX LEA SI,KEY LEA BX,TAB LEA DI,TMP MOV CX,5 NEXT:MOV AL,SI XLAT MOV DI,AL INC SI INC DI DEC CX JNZ NEXT INT 3H CODEENDS ENDSTART,完成0+1+9结果放如AL,CODE SEGMENT ASSUME CS:CODE START:MOV CX,9 MOV AL,0 MOV BL,1 NEXT:ADD AL,BL INC BL DEC CX JNZ NEXT INT 3 CO

6、DEENDS ENDSTART,CODE SEGMENT ASSUME CS:CODE START:MOV AL,0 MOV BL,1 NEXT:ADD AL,BL INC BL CMP BL,10 JNZ NEXT INT 3 CODEENDS ENDSTART,完成0+1+999结果放入DX、AX中,CODE SEGMENT ASSUME CS:CODE START:MOV AX,00H MOV BX,01H MOV DX,00H NEXT2:ADD AX,BX JNC NEXT1 ADD DX,01H NEXT1:INC BX CMP BX,1000 JNZ NEXT2 INT 3H C

7、ODE ENDS ENDSTART,.MODEL SMALL .486P .CODE .STARTUP START:MOV EAX,0 MOV EBX,1 NEXT:ADD EAX,EBX INC EBX CMP EBX,1000 JNZ NEXT .EXIT END,输入功能调用,功能号:01H 功能:从标准输入设备读入一个字符,滤掉控制字符,并显示 入口参数: AH=01H 出口参数: AL=输入字符的ASCII码 例: MOVAH,01H INT21H,输出功能调用,功能号:02H 功能:从标准输出设备输出一个字符 入口参数: AH=02H DL=待输出的字符的ASCII码 例: MOV

8、DL,A MOVAH,02H INT21H,从键盘输入10个数字存入内存中,DATASEGMENT TMPDB10 DUP(?) DATAENDS CODESEGMENT ASSUMECS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX LEA BX,TMP MOV CX,10 NEXT:MOV AH,01H INT 21H MOV BX,AL INC BX DEC CX JNZ NEXT MOV AH,4CH INT 21H CODEENDS ENDSTART,从键盘输入任意10个字符并倒序输出,DATASEGMENT TMPDB10 DUP(?) DATA

9、ENDS CODESEGMENT ASSUMECS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX LEA BX,TMP MOV CX,10 NEXT:MOV AH,01H INT 21H MOV BX,AL INC BX DEC CX JNZ NEXT MOV CX,10 NEXT2:DEC BX MOV DL,BX MOV AH,02H INT 21H DEC CX JNZ NEXT2 MOV AH,4CH INT 21H CODEENDS ENDSTART,STACKSEGMENT TMPDW100 DUP(?) STACKENDS CODESEGMENT ASSUMECS:CODE,SS:STACK START:MOV CX,10