此浮点数格式的转换： 1）ASCII码到浮点数：   float C4toD(char * c) {        BYTE     Hd[30], Jiema[30];        float   DTc[30];        float  Decimal = 0;          memset(Hd, 0, sizeof(Hd));        memset(Jiema, 0, sizeof(Jiema));        memset(DTc, 0, sizeof(DTc));          float   returnflo = 0;        BOOL     ShuFU = FALSE, JieFU = FALSE;          if((c[7] > 0x40) && (c[7] < 0x47))               Hd[7] = ((c[7]  - 0x37) & 0x0f);        else if((c[7] > 0x60) && (c[7] < 0x67))               Hd[7] = ((c[7]  - 0x57) & 0x0f);        else               Hd[7] = ((c[7]  - 0x30) & 0x0f);          if((c[6] > 0x40) && (c[6] < 0x47))               Hd[6] = ((c[6]  - 0x37) & 0x0f);        else if((c[6] > 0x60) && (c[6] < 0x67))               Hd[6] = ((c[6]  - 0x57) & 0x0f);        else               Hd[6] = ((c[6]  - 0x30) & 0x0f);          DTc[2] = (float)(((float)(Hd[6] * 16.0) + (float)(Hd[7])) / 256.0);          if((c[5] > 0x40) && (c[5] < 0x47))               Hd[5] = ((c[5]  - 0x37) & 0x0f);        else if((c[5] > 0x60) && (c[5] < 0x67))               Hd[5] = ((c[5]  - 0x57) & 0x0f);        else               Hd[5] = ((c[5]  - 0x30) & 0x0f);          if((c[4] > 0x40) && (c[4] < 0x47))               Hd[4] = ((c[4]  - 0x37) & 0x0f);        else if((c[4] > 0x60) && (c[4] < 0x67))               Hd[4] = ((c[4]  - 0x57) & 0x0f);        else               Hd[4] = ((c[4]  - 0x30) & 0x0f);          DTc[1] = (float)((((float)(Hd[4] * 16.0) + (float)Hd[5]) + DTc[2]) / 256.0);          if((c[3] > 0x40) && (c[3] < 0x47))               Hd[3] = ((c[3]  - 0x37) & 0x0f);        else if((c[3] > 0x60) && (c[3] < 0x67))               Hd[3] = ((c[3]  - 0x57) & 0x0f);        else               Hd[3] = ((c[3]  - 0x30) & 0x0f);          if((c[2] > 0x40) && (c[2] < 0x47))               Hd[2] = ((c[2]  - 0x37) & 0x0f);        else if((c[2] > 0x60) && (c[2] < 0x67))               Hd[2] = ((c[2]  - 0x57) & 0x0f);        else               Hd[2] = ((c[2]  - 0x30) & 0x0f);          Decimal = (float)(((float)(Hd[2] * 16) + (float)(Hd[3]) + DTc[1])/ 256.0);          if((c[1] > 0x40) && (c[1] < 0x47))               Jiema[1] = ((c[1]  - 0x37) & 0x0f);        else if((c[1] > 0x60) && (c[1] < 0x67))               Jiema[1] = ((c[1]  - 0x57) & 0x0f);             else               Jiema[1] = ((c[1]  - 0x30) & 0x0f);          if((c[0] > 0x40) && (c[0] < 0x47))               Jiema[0] = ((c[0]  - 0x37) & 0x0f);        else if((c[0] > 0x60) && (c[0] < 0x67))               Jiema[0] = ((c[0]  - 0x57) & 0x0f);        else               Jiema[0] = ((c[0]  - 0x30) & 0x0f);            ShuFU = ((Jiema[0] & 0x08) >> 3) > 0;        JieFU = ((Jiema[0] & 0x04) >> 2) > 0;          Jiema[2] = (Jiema[0] & 0x03) * 16 + Jiema[1];               if(JieFU)               returnflo = (float)pow(2, (-1) * Jiema[2]) * Decimal;        else               returnflo = (float)pow(2, Jiema[2]) * Decimal;          if(ShuFU)               returnflo = (-1) * returnflo;          return returnflo; } 2）浮点数到ASCII码：   void D4toC(char * c,float d) {     BYTE    i = 0, Jiema = 0;        char    inbyte1[30];        BOOL    ShuFu = FALSE, JieFu = FALSE;        int     inbyte2 = 0, inbyte3 = 0, inbyte4 = 0;        char    afterbyte2[30], afterbyte3[30], afterbyte4[30];        float   F_afterbyte2 = 0, F_afterbyte3 = 0, F_afterbyte4 = 0;          memset(inbyte1, 0x30, sizeof(inbyte1));        memset(afterbyte2, 0x30, sizeof(afterbyte2));        memset(afterbyte3, 0x30, sizeof(afterbyte3));        memset(afterbyte4, 0x30, sizeof(afterbyte4));               inbyte1[10] = 0x0;        afterbyte2[10] = 0x0;        afterbyte3[10] = 0x0;        afterbyte4[10] = 0x0;               if(d == 0)        {               for(int j = 0; j < 8; j++)                      c[j] = 0x30;               return;        }        if(d < 0)        {               ShuFu = TRUE;               d = (-1) * d;        }               while(d > 1)        {               d =(float)(d / 2.0);               i ++;        }          while(d <= 0.5)        {               JieFu = TRUE;               d = (float)(d * 2.0);               i ++;        }          if(d == 1)        {               for(int j = 2; j < 8; j++)                      c[j] = 0x46;                 }            else        {                   inbyte2 = (int)(d * 256);               F_afterbyte2 = (d * 256) - (int)(d * 256);               inbyte3 = (int)(F_afterbyte2 * 256);               F_afterbyte3 = (F_afterbyte2 * 256) - (int)(F_afterbyte2 * 256);               inbyte4 = (int)(F_afterbyte3 * 256);               F_afterbyte4 = (F_afterbyte3 * 256) - (int)(F_afterbyte3 * 256);                 itoa(inbyte2, afterbyte2, 16);               itoa(inbyte3, afterbyte3, 16);               itoa(inbyte4, afterbyte4, 16);                 if(inbyte2 == 0)               {                      c[2] = 0x30;                      c[3] = 0x30;               }               else if(inbyte2 < 16)               {                      c[2] = 0x30;                      c[3] = afterbyte2[0];               }               else               {                      c[2] = afterbyte2[0];                      c[3] = afterbyte2[1];               }               if(inbyte3 == 0)               {                      c[4] = 0x30;                      c[5] = 0x30;               }               else if(inbyte3 < 16)               {                      c[4] = 0x30;                      c[5] = afterbyte3[0];               }               else               {                      c[4] = afterbyte3[0];                      c[5] = afterbyte3[1];               }               if(inbyte4 == 0)               {                      c[6] = 0x30;                      c[7] = 0x30;               }               else if(inbyte4 < 16)               {                      c[6] = 0x30;                      c[7] = afterbyte4[0];               }               else               {                      c[6] = afterbyte4[0];                      c[7] = afterbyte4[1];               }        }          if(JieFu)        {               if(i > 0x3f)                      i = 0x3f;        }        else if(i > 0x32)               i = 32;        if(ShuFu)               i = i | 0x80;        if(JieFu)               i = i | 0x40;        itoa(i, inbyte1, 16);          if(inbyte1 == 0)        {               c[0] = 0x30;               c[1] = 0x30;        }        else if(i < 16)        {               c[0] = 0x30;               c[1] = inbyte1[0];        }        else        {               c[0] = inbyte1[0];               c[1] = inbyte1[1];        }               for(i = 0; i < 8; i ++)        {               if((c[i] > 0x60) && (c[i] < 0x67))                      c[i] = c[i] - 0x20;        }          c[8] = 0x00; }