chapter4.htm

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      face="宋体" size="5" color="#FF0000">MOV&nbsp; DI，CX</font></p>
      <blockquote>
        <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; BX，0</font></p>
      </blockquote>
      <p align="left"><font face="宋体" size="5" color="#FFFF00">LOOP2：MOV&nbsp; AX，TABLE[BX]</font></p>
      <blockquote>
        <p align="left"><font face="宋体" size="5" color="#FFFF00">CMP&nbsp; AX，TABLE[BX+2]</font></p>
        <p align="left"><font face="宋体" size="5" color="#FFFF00">JBE&nbsp; GOON</font></p>
        <p align="left"><font face="宋体" size="5" color="#FFFF00">XCHG&nbsp; AX，TABLE[BX+2]</font></p>
        <p align="left"><font face="宋体" size="5" color="#FFFF00">MOV&nbsp; TABLE[BX]，AX</font></p>
      </blockquote>
      <p align="left"><font face="宋体" size="5" color="#FFFF00">GOON：ADD&nbsp; BX，2</font></p>
      <blockquote>
        <p align="left"><font face="宋体" size="5" color="#FFFF00">LOOP&nbsp; LOOP2</font></p>
        <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; CX，DI</font></p>
        <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">LOOP&nbsp; LOOP1</font></p>
      </blockquote>
      <blockquote>
        <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">RET</font></p>
      </blockquote>
      <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MAIN&nbsp; ENDP</font></p>
      <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CODE&nbsp; ENDS</font></p>
      <blockquote>
        <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">END&nbsp; START</font></p>
      </blockquote>
    </blockquote>
  </blockquote>
</blockquote>

<h3 align="left"><font FACE="宋体" size="5" color="#FFFFFF">三、子程序结构设计</font></h3>

<blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">1、子程序的定义和调用</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">1）定义：同过程的定义。</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">过程名&nbsp; PROC &nbsp; 
    NEAR/FAR</font></p>
    <blockquote>
      <blockquote>
        <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">....</font></p>
      </blockquote>
    </blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">过程名&nbsp; ENDP</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">2）调用：CALL指令。</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">2、现场的保存和恢复</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">现场：当前寄存器和一些关键变量的值。</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">例如，在某个子程序中：</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">SUBPRO&nbsp; PROC&nbsp; NEAR</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">PUSH&nbsp; AX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">PUSH&nbsp; BX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">PUSH&nbsp; CX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">PUSH&nbsp; DX</font></p>
    <blockquote>
      <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">....</font></p>
    </blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">POP&nbsp; DX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">POP&nbsp; CX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">POP&nbsp; BX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">POP&nbsp; AX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">RET</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">SUBPRO&nbsp; ENDP</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">3、子程序的参数传递</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">1）通过寄存器传递参数。</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">例如：将从键盘输入的0～0FFFFH的十六进制数以有符号的十进制数显示出来。</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CODE&nbsp; SEGMENT</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MAIN&nbsp; PROC&nbsp; FAR</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">ASSUME&nbsp; CS：CODE</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">START：PUSH&nbsp; DS</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">XOR&nbsp; AX，AX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">PUSH&nbsp; AX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; HEXTOBIN</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; CRLF</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; BINTODEC</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; CRLF</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">RET</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MAIN&nbsp; ENDP</font></p>
  <p align="left">　</p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">HEXTOBIN&nbsp; PROC &nbsp; 
  NEAR</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; BX，0</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">NEWCHAR：MOV&nbsp; AH，01</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">INT&nbsp; 21H</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">SUB&nbsp; AL，30H</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">JB&nbsp; EXIT</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CMP&nbsp; AL，10</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">JB&nbsp; DIGIT</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">SUB&nbsp; AL，07</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CMP&nbsp; AL，0AH</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">JB&nbsp; EXIT</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CMP&nbsp; AL，10H</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">JAE&nbsp; EXIT</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">DIGIT：MOV&nbsp; CL，4</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">SHL&nbsp; BX，CL</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; AH，0</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">ADD&nbsp; BX，AX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">JMP&nbsp; NEWCHAR</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">EXIT：RET</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">HEXTOBIN&nbsp; ENDP</font></p>
  <p align="left">　</p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">BINTODEC&nbsp; PROC &nbsp; 
  NEAR</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">AND&nbsp; BX，BX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">JNS&nbsp; POSITIVE</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">NEG&nbsp; BX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; DL，‘-’</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; AH，02</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">INT&nbsp; 21H</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">POSITIVE：MOV&nbsp; CX，10000</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; DECDIV</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; CX，1000</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; DECDIV</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; CX，100</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; DECDIV</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; CX，10</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; DECDIV</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; CX，1</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CALL&nbsp; DECDIV</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">RET</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">BINTODEC ENDP</font></p>
  <p align="left">　</p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">DECDIV PROC NEAR</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; AX，BX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; DX，0</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">DIV&nbsp; CX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; BX，DX</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; DL，AL</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">ADD&nbsp; DL，30H</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; AH，02</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">INT 21H</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">RET</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">DECDIV&nbsp; ENDP</font></p>
  <p align="left">　</p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CRLF&nbsp; PROC NEAR</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; DL，0AH 
    &nbsp;&nbsp; ；line feed</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; AH，02</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">INT 21H</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; DL，0DH 
    &nbsp;&nbsp; ；carriage return</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MOV&nbsp; AH，02</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">INT 21H</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">RET</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CRLF&nbsp; ENDP</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CODE ENDS</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">END&nbsp; START</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">2）通过地址表传递参数地址</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">例如：</font></p>
</blockquote>

<blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">DATA&nbsp; SEGMENT</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">ARY&nbsp; DW&nbsp; 100 &nbsp; 
    DUP（？）</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">COUNT&nbsp; DW&nbsp; 100</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">SUM&nbsp; DW&nbsp; ？</font></p>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">TABLE&nbsp; DW&nbsp; 3 &nbsp; 
    DUP（？）</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">DATA&nbsp; ENDS</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">CODE&nbsp; SEGMENT</font></p>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">MAIN&nbsp; PROC&nbsp; FAR</font></p>
  <blockquote>
    <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">ASSUME&nbsp; CS：CODE，DS：DATA，ES：DATA</font></p>
  </blockquote>
  <p align="left"><font FACE="宋体" size="5" color="#FFFFFF">START：PUSH&nbsp; DS</font></p>
  <blockq