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Mma's output cells are by default in StandardForm. While this has obvious advantages, sometimes it can get annoying, for example when I wish to copy paste the output. When this happens, I usually manually right-click the cell and convert it to InputForm.

But is it possible to set these output cells to be in InputForm by default? Because under Preferences -> Evaluation -> Format type of new output cells I can only see three possibilities: StandardForm, TraditionalForm and OutputForm.

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  • $\begingroup$ Why not just use Copy As > Input Text, either from the Edit menu or the (left-click) context menu? $\endgroup$ – m_goldberg Mar 13 '15 at 17:26
  • $\begingroup$ @m_goldberg First, because, for example, the constant Pi gets copied as \[Pi] this way, as opposed to converting it to InputForm, when it gets copied as Pi. Second, because I was wondering if there is any auto solution, that wouldn't require any extra clicking... $\endgroup$ – gaazkam Mar 13 '15 at 17:29
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You can use $PrePrint to achieve this:

$PrePrint = InputForm;

Now every output will be preprocessed by InputForm before it is printed.
Use

$PrePrint =.;

to restore the default behavior.
You could also use $Post instead of $PrePrint. However, when $Post is used you'll get Null as an output when there normally is no output, e.g. if the input ended with ;.

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  • $\begingroup$ Many thanks! Out of curiosity: what's the difference between $PrePrint and $Post? Because from what I read in the documentation, they seem pretty much the same... $\endgroup$ – gaazkam Mar 13 '15 at 17:36
  • $\begingroup$ @gaazkam I thing $PrePrint is the better choice. Please see my edit why. $\endgroup$ – Karsten 7. Mar 13 '15 at 17:54
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I think a cleaner way to achieve this would be:

SetOptions[$Output, FormatType -> InputForm];
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  • $\begingroup$ This method produces an odd placing of the output (example), as it's printed before the Outs, which appear empty. Nevertheless +1. $\endgroup$ – Karsten 7. Oct 4 '15 at 16:38

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