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標(biāo)題: C語(yǔ)言二分法查表問(wèn)題,輸入需要查詢的數(shù)字,然后輸出下表,當(dāng)輸入的數(shù)據(jù)不在查詢內(nèi) [打印本頁(yè)]

作者: qwettyuio 時(shí)間: 2022-1-19 15:58
標(biāo)題: C語(yǔ)言二分法查表問(wèn)題,輸入需要查詢的數(shù)字,然后輸出下表,當(dāng)輸入的數(shù)據(jù)不在查詢內(nèi)
本帖最后由 qwettyuio 于 2022-1-19 17:33 編輯

輸入的CurrentAD不在查詢的數(shù)組中時(shí)，返回距離最近的值下標(biāo)，查詢140時(shí)，沒(méi)有該數(shù)，側(cè)返回139下標(biāo)，求指導(dǎo)一下，該怎么解決
C語(yǔ)言源程序如下:
uchar code tabe1[11] = {0xF0,0x00,0xD0,0x90,0x20,0xB0,0xF0,0x10,0xF0,0xB0};
uchar code tabe2[11] = {0xA0,0xA0,0x60,0xE0,0xE0,0xC0,0xC0,0xA0,0xE0,0xE0};
uchar a0,a1,a2;
uint num;
uchar code NTC_AD[141] = {
25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,45,46,47,48,50,51,52,54,55,    //60℃  --- 87℃
56,58,59,30,62,63,65,66,68,69,71,72,74,75,77,79,80,82,83,85,87,88,90,92,93,95,97,98,    //88℃  --- 115℃
100,102,103,105,107,108,110,112,112,115,116,118,120,121,123,125,126,128,130,131,133,    //116℃ --- 136℃
134,136,137,139,141,142,144,145,147,148,150,151,152,154,155,157,158,159,161,162,163,    //137℃ --- 157℃
165,166,167,169,170,171,172,173,174,175,176,177,178,179,181,182,183,184,185,186,187,    //158℃ --- 178℃
188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209 //179℃ --- 200℃
               };
/*******************************************************************************
* Function Name  : Sheshi_Init()
* Description : 顯示對(duì)應(yīng)的溫度以及熟度(℃)
*******************************************************************************/
void Sheshi_Init(uchar a0,uchar a1,uchar a2)
{
      Write_1621(23,tabe1[a0],4);
      Write_1621(24,tabe2[a0],4);
      Write_1621(25,tabe1[a1],4);
      Write_1621(26,tabe2[a1],4);
      Write_1621(27,tabe1[a2],4);
      Write_1621(28,tabe2[a2],4);
}
float Bin_Search(uchar CurrentAD)
{
      int start = 0;
      int end = 141;
      int mid = 0;
      while(start <= end)
      {
            mid =(start+end)/2;
            if(CurrentAD==NTC_AD[mid]) break;
            else if(CurrentAD>NTC_AD[mid])
            {
                     start = mid +1;
            }
            else if(CurrentAD < NTC_AD[mid])
            {
                     end = mid-1;
            }
      }
      return mid;
}
void main( )
{
      uchar CurrentAD=0;
      Init_1621();    //初始化HT1621
      HT1621_all_off();  //清空LCD顯示
      while(1)
      {
            CurrentAD=31;
            num=Bin_Search(CurrentAD)+60;
            a0=num/100;
            a1=num/10%10;
            a2=num%10;
            Sheshi_Init(a0,a1,a2);
      }
}

作者: 人工置頂員 時(shí)間: 2022-1-20 00:36
頂一下

作者: wulin 時(shí)間: 2022-1-20 07:49
兩個(gè)下標(biāo)之間的數(shù)就近算整數(shù)，差值可以計(jì)算小數(shù)，給你一個(gè)示例參考。

-30~150度數(shù)碼管溫度計(jì)(對(duì)分查表法).rar (27.25 KB, 下載次數(shù): 18)

作者: rundstedt 時(shí)間: 2022-1-20 20:42

CurrentAD=CurrentAD>=139?CurrentAD:139;

復(fù)制代碼

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