为什么c++读取字节的结果与c#不同?

I have C# code below:

下面是c#代码:

FileStream fs       = new FileStream("output.bin", FileMode.Open);
BinaryReader _br    = new BinaryReader(fs);
var a               = _br.ReadByte();
var b               = _br.ReadByte();
fs.Close();
FileStream f