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📄 十进制转bcd三种算法的比较(haotz).htm

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      <P align=center>文章编号:1248----加入日期:2004-3-12 </P></TD></TR>
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      <P align=center><B>十进制转bcd三种算法的比较(haotz)</B></P></TD></TR>
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      <BLOCKQUOTE><BR>// 
        <BR>*********************************************************************<BR>************ 
        <BR><BR>//&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp; Function:&nbsp; 
        DecimalToBcdAscii <BR>*<BR>// * Description: Convert <BR>decimal value 
        to 3 digit BCD ASCII value 
        *<BR>//&nbsp;&nbsp;<BR>*******************************************************************************<BR>**<BR>unsigned 
        char Hundreds,Tens,Ones;<BR>void DecimalToBcdAscii(signed short 
        DecimalValue)<BR>{<BR>&nbsp;&nbsp;&nbsp; Hundreds = 0; <BR>// Initialize 
        BCD values<BR>&nbsp;&nbsp; Tens = 0;<BR>&nbsp;&nbsp; Ones = 
        0;<BR>&nbsp;&nbsp;<BR>&nbsp;&nbsp; Hundreds: <BR>// 
        Hundreds<BR>&nbsp;&nbsp;&nbsp;&nbsp; DecimalValue = DecimalValue - 
        100;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (DecimalValue &lt; 
        0)&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        {<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; goto 
        Tens1;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        }<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Hundreds = Hundreds + 1; // 
        Increment <BR>Hundreds count<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        goto Hundreds;&nbsp; <BR>&nbsp;&nbsp; Tens1: <BR>// 
        Tens<BR>&nbsp;&nbsp;&nbsp;&nbsp; DecimalValue = DecimalValue + 
        100;<BR>&nbsp;&nbsp; Tens2:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        DecimalValue = DecimalValue - 
        10;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (DecimalValue &lt; 
        0)&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        {<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; goto 
        Ones1;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        }<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Tens = Tens + 1; // 
        <BR>Increment Tens count<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; goto 
        Tens2;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp; Ones1: <BR>// 
        Ones<BR>&nbsp;&nbsp;&nbsp;&nbsp; DecimalValue = DecimalValue + 
        10;<BR>&nbsp;&nbsp; Ones2:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        DecimalValue = DecimalValue - 1;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        if (DecimalValue &lt; 
        0)&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        {<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; goto 
        AddAsciiOffset;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        }<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ones = Ones + 1; // 
        <BR>Increment Ones count<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; goto 
        Ones2;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp; AddAsciiOffset: 
        <BR>// Add ASCII offset<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Hundreds 
        = Hundreds + 48;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Tens = Tens + 
        48;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ones = Ones + 48; 
        <BR>}<BR>#include&lt;reg51.h&gt;<BR>#include&lt;stdio.h&gt;<BR>main()<BR>{//clk=12Mhz<BR>int 
        i;<BR>//算法1 耗时0.25s<BR>for (i=0;i&lt;1000;i++)<BR>DecimalToBcdAscii(i); 
        <BR>//算法2 耗时0.42s<BR>for (i=0;i&lt;1000;i++)<BR>{int 
        t;<BR>&nbsp;Hundreds=i/100;<BR>&nbsp;t=i%100;<BR>&nbsp;Tens=t/10;<BR>&nbsp;Ones=i%10;<BR>&nbsp;}<BR>Hundreds 
        = Hundreds + 48;<BR>Tens = Tens + 48;<BR>Ones = Ones + 48; <BR>//算法3 
        耗时1.5s<BR>for (i=0;i&lt;1000;i++)<BR>{unsigned char 
        buf[5];<BR>sprintf(buf,"%3d",i);<BR>}<BR>} <BR><BR>(文章推荐人：电池) 
      <BR><BR></BLOCKQUOTE></TD></TR>
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