How can I specify the number of days to keep local history for source code files?

To change the history length for the C source editor, follow steps below:

1. From the C/C++ perspective toolbar, select Window > Preferences .

   The Preferences window appears.

2. Select General > Workspace > Local History .
3. The Local History settings appear.
4. In the Days to Keep Files textbox, change the days to keep files value.
5. Click Apply .
6. Click OK .

The history length for the C source editor is updated.