川农汇编语言实验五(1).doc

实验五 分支结构程序设计信息与工程技术学院 10级电气2班 吕峰 201051565.9stacks segment stack s db 20 dup(0) stacks ends data segment n equ 4 char db n+1 ;输入内存字符db 0 db n+1 dup(0) input db Input the number:,0dh,0ah,$ enter db 0dh,0ah,$ output db Result is:,0dh,0ah,$ data ends code segment assume cs:code,ss:stacks,ds:data start: mov ax,data mov ds,ax lea dx,input mov ah,9 int 21h lea dx, char mov ah,0ah int 21h lea dx,enter mov ah,9 int 21h mov si,2 mov cx,4 l0: mov bl,charsi cmp bl,30h jb start cmp bl,39h jbe l00 cmp bl,61h jb start cmp bl,66h ja start sub bl,57h jmp l333 l00: sub bl,30h l333:mov charsi,bl inc si dec cx jnz l0 lea dx,output mov ah,9 int 21h mov si,2 l000:mov bl,charsi mov ch,4 mov cl,4 shl bl,cl ll00:test bl,80h jnz l1 mov dl,0 mov ah,2 int 21h jmp l2 l1: mov dl,1 mov ah,2 int 21h l2: shl bl,1 dec ch jnz ll00 inc si cmp si,6 jne l000 mov ah,4ch int 21h code ends end start5.21DSEG SEGMENTARRAY DW 3 DUP (?)DSEG ENDS；-CSEG SEGMENTMAIN PROC FARASSUME CS: CSEG, DS: DSEGSTART: PUSH DS ；设置返回DOSSUB AX, AXPUSH AXMOV AX, DSEGMOV DS, AX ；给DS赋值BEGIN: LEA SI, ARRAYMOV DX, 0 ；(DX)用于存放所求的结果MOV AX, SIMOV BX, SI+2CMP AX, BX ；比较第一和第二两个数是否相等JNE NEXT1INC DXNEXT1: CMP SI+4, AX ；比较第一和第三两个数是否相等JNE NEXT2INC DXNEXT2: CMP SI+4, BX ；比较第二和第三两个数是否相等JNE NUMINC DXNUM: CMP DX, 3JL DISPDEC DXDISP: ADD DL, 30H ；转换为ASCII码MOV AH, 2 ；显示一个字符INT 21HRETMAIN ENDPCSEG ENDS ；以上定义代码段；-END START第三题：DSEG SEGMENTDATAX DB 6HDATAY DB 4HDSEG ENDSCSEG SEGMENT ASSUME CS:CSEG,DS:DSEGSTART: MOV AX,DSEG MOV DS,AX MOV BL,DATAX MOV BH,DATAY MOV AH,01H INT 21H CMP AL,+ JE Q1 CMP AL,- JE Q2 CMP AL,* JE Q3 CMP AL,/ JE Q4Q4: MOV AL,BL SUB AH,AH DIV BH MOV BL,AL JMP Q5Q3: MOV AL,BH MUL BL MOV BL,AL JMP Q5Q2: SUB BL,BH JMP Q5Q1: ADD BL,BHQ5: MOV AL,BL MOV CL,4 SHR AL,CL ADD AL,30H CMP AL,39H JBE OK1 ADD AL,07HOK1: MOV DL,AL MOV AH,02H INT 21H MOV AL,BL AND AL,0FH ADD AL,30H CMP AL,39H JBE OK2 ADD AL,07HOK2: MOV DL,AL MOV AH,02H INT 21H MOV AH,4CH INT 21HCSEG ENDS END START第四题：ASSUME CS:CODE,DS:DATA,SS:STACKDATA SEGMENT NUMBER DB 0 STR1 DB Please enter a number:$ DATA ENDSSTACK SEGMENT STACK DB 80 DUP(0)STACK ENDSCODE SEGMENTSTART: MOV AX,DATA MOV DS,AX MOV AX,STACK MOV SS,AX MOV DX,OFFSET STR1 MOV AH,09H INT 21H MOV AH,01H INT 21H SUB AL,30H MOV CL,AL CMP CL,3H JE X3 CMP CL,4H JE X4 CMP CL,5H JE X5 CMP CL,6H JE X6X3: MOV AL,CL MUL AL MOV CH,0 ADD AX,CX JMP OUTPUTX4: MOV AL,CL MUL AL MOV CH,0 SUB AX,CX SUB AX,CX JMP OUTPUTX5: MOV AL,CL MUL AL JMP OUTPUTX6: MOV AL,CL MUL AL MOV DX,AX MOV AX,2 DIV DX MOV AH,0 JMP OUTPUTOUTPUT: MOV BL,10H DIV BL MOV DL,AL CMP DL,09H JA ALPHA1 JMP NUMBER1OUTPUT1:PUSH AXPUSH DX MOV dl,0AH mov ah,02h int 21h mov dl,0Dh mov ah,02h int 21hpop dx MOV AH,02H INT 21H POP AX MOV DL,AH CMP DL,09H JA ALPHA2 JMP NUMBER2OUTPUT2:MOV AH,02H INT 21H MOV AX,4C00H int 21HALPHA1: add DL