NumberMarks
 Usage
• NumberMarks是InputForm及其相关函数的可选项,用来指定在近似数的输出形式中是否应包含 ` 标记.
Notes
• NumberMarks 的缺省设置由的$NumberMarks值给出. • NumberMarks->True指明` 应被使用到除机器精度数和任意精度数外的所有近似数中. • NumberMarks -> Automatic指明应被使用在除机器精度数外的任意精度数中. • NumberMarks -> False 指明在输出数中从不使用 `. • 数值标记用来指明数值的类型，及它们的精确度或准确度.
• 科学记数法的*^形式总被使用在InputForm中，且与NumberMarks无关.
 Further Examples
In standard output form, numbers are printed to 6 digits.
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In input form, all known digits are printed.
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Out[2]//InputForm=
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Here is an arbitrary-precision number in standard output form.
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In input form, Mathematica explicitly indicates the precision of the number and gives extra digits to make sure the number can be reconstructed correctly.
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Out[4]//InputForm=
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This makes Mathematica not explicitly indicate precision.
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Out[5]//InputForm=
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