在VB程序中，完成字符与单精度浮点数的转换，其中StringToDouble为字符串转换为单精度数，FloatToString为单精度数转换为4字节字符串。-in VB program, complete with characters in the single precision floating point conversion, which StringToDouble to string conversion of single-precision the number of sing

浮点数互换，字符格式与实际值之间相互转换。-Float swap