Question

在“网络”之前,在“数学共同处理器”之前,在“EPC-574”之前,Microsoft确定了浮动点号码的借方模式。原来的C++汇编者习惯使用这一定义。

我正在撰写一份C#,在档案中需要阅读/填写这种浮点号码。我如何能够在2个轨道格式之间转换? 我需要双向转换方法。

这项评估将在PC/WinCE环境中进行。

改变档案结构是该项目的范围之外。

是否有C++汇编者方案指示其使用旧的FP格式? 这将是理想的。然后,我可以通过使用无区分的文本体法,在C#代码和C++代码之间交换数据,而C++方法将是围绕印本和功能的简单包装。

至少,我希望有人能够回答旧的FP格式的借方定义,因此,如果有必要,我可以把低水平的借方操纵算法汇集起来。

感谢。

Answer 1

紧接着了Johannes Rössel s Wikipedialink ,发现甲型六氯环己烷执行太难于翻译:

The document of the Format from Bengt Richter in this connection:

According to an old MASM 5.0 programmer s guide, there was a Microsoft Binary format for encoding real numbers, both short (32 bits) and long (64 bits).

共有3个部分:

Biased 8-bit exponent in the highest byte (last in the little-endian view we ve been using) It says the bias is 0x81 for short numbers and 0x401 for long, but I m not sure where that lines up. I just got there by experimentation.

二级最高分辨率(+0, 1-)的分辨率

All except the first set bit of the mantissa in the remaining 7 bits of the second highest byte, and the rest of the bytes. And since the most signficant bit for non-zero numbers is 1, it is not represented. But if if were, it would share the same bit position where the sign is (that s why I or-ed it in there to complete the actual mantissa).

MASM also supported a 10-byte format similar to IEEE. I didn t see anything in that section on NaNs and INFs.

Answer 2

根据Johannes的回答,你可以到。用于从mbf向电子计算机系统下载源代码。

EDIT:实际上,这不利于你。但实际的MBF格式载于以下网址::

  -------------------------------------------------
 |              |    |                             |
 |8 Bit Exponent|Sign|   55 Bit Mantissa           |
 |              | Bit|                             |
  -------------------------------------------------

友情链接