//转换float数据到字节数组  unsigned char i;  float floatVariable;  unsigned char charArray[4];  (unsigned char) *pdata = ((unsigned char)*)&floatVariable;  //把float类型的指针强制转换为unsigned char型  for(i=0;i<4;i++)  {      charArray[i] = *pdata++;//把相应地址中的数据保存到unsigned char数组中       }    //转换字节数组到float数据  float   floatVariable;  unsigned char  i;   void   *pf;       pf = &floatVariable;   (unsigned char) * px = charArray;      for(i=0;i<4;i++)  {      *(((unsigned char)*)pf+i)=*(px+i);       }