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word版可編輯-新編匯編語言程序設(shè)計(jì)四五章習(xí)題參考解答精心整理-資料下載頁

2025-04-07 06:57本頁面
  

【正文】 SUM DW 0PROMPT1 DB 0DH, 0AH, 39。INPUT THE NUMBER:$39。PROMPT2 DB 0DH, 0AH, 39。THE SUM IS:$39。DATA ENDSCODE1 SEGMENTASSUME DS: DATA, CS: CODE1START: MOV AX, DATA MOV DS, AX LEA DX, PROMPT1 CALL READDEC CMP AX, 0 JZ EXIT MOV CX, AX CALL FAR PTR SUMM LEA DX, PROMPT2 CALL WRITEDEC CALL CRLFEXIT: MOV AX, 4C00H INT 21HCODE1 ENDSEND START 編寫排序子程序SORT,以DS、SI和CX作為入口參數(shù),把DS:SI為起始地址的一個(gè)帶符號(hào)的字?jǐn)?shù)組進(jìn)行由小到大排序,參數(shù)CX中存放的是數(shù)組中元素個(gè)數(shù)。解:DATAREA SEGMENTARRAY DW 1, 9, 6, 8, 5, 4CNT DW 6ADDR DW ?DATAREA ENDSCODE SEGMENTASSUME CS: CODE, DS: DATAREASTART: MOV AX, DATAREA MOV DS, AX LEA SI, ARRAY MOV CX, CNT CALL SORT MOV AX, 4C00H INT 21HSORT PROC PUSH CX PUSH AX PUSH BX PUSH SIINIT: MOV BX, 1 DEC CX JZ SORTED PUSH SI PUSH CXNEXT: MOV AX, [SI]CMP [SI+2], AX JGE CONT XCHG [SI+2], AX MOV [SI], AX XOR BX, BX 。 置交換標(biāo)志CONT: ADD SI, 2LOOP NEXTPOP SIPOP CX CMP BX, 0 JE INITSORTED: POP SIPOP BX POP AX POP CX RETSORT ENDPCODE ENDSEND START 編寫一個(gè)子程序,以AX為入口參數(shù),把AX中的各個(gè)二進(jìn)制位顛倒次序后還放回AX中。例如,入口參數(shù)AX=1011000111101001B,處理后AX應(yīng)為1001011110001101B。解: INVERT PROC PUSH CX PUSH BX MOV CX, 16NEXT:ROL AX, 1 RCR BX, 1 LOOP NEXT MOV AX, BX POP BX POP CX RETINVERT ENDP 編寫子程序,入口參數(shù)是一個(gè)字?jǐn)?shù)據(jù),存放在AX中,統(tǒng)計(jì)該字的16個(gè)二進(jìn)制位中含有多少個(gè)1和多少個(gè)0。解:DATA SEGMENTNUM DW 1234HZERO DB 0ONE DB 0DATA ENDSCODE SEGMENTASSUME DS: DATA, CS: CODESTART:MOV AX, DATA MOV DS, AX MOV AX, NUM MOV CX, 16 CALL COUNT MOV ONE, AL MOV ZERO, AH MOV AX, 4C00H INT 21HCOUNT PROC PUSH BX MOV BX, 0NEXT: ROL AX, 1 ADC BX, 0 LOOP NEXT MOV BH, 16 SUB BH, BL MOV AX, BX POP BX RETCOUNT ENDPCODE ENDS END START 編寫一段遞歸子程序計(jì)算N!(N=0)。其遞歸定義如下:0!=1N! =N * (N1)! (N0)解: .DATA N DW 5 M DD ? .CODESTART: MOV AX, @DATA MOV DS, AX MOV CX, N CALL FACT MOV WORD PTR M, AX MOV WORD PTR M+2, DX MOV AX, 4C00H INT 21HFACT PROC NEARCMP CX, 0 JZ DONE PUSH CX DEC CX CALL FACT POP CX MUL CX JMP EXIT DONE: MOV AX, 1EXIT: RETFACT ENDP END START
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