when I am running coding in control panel, the + appears in front of each line instead of <

I am new to R
I am running the control panel, after I ran certain code, the < character which appears at the beginning of each line become + character. I think the reason is that I forgot to add " at last line. but now, control C doesn't work. I wonder what's the reason of it.
I know restart the program will work.


This happens when R detects that the command is incomplete. Note that, + starts to appear after this command:


Here, you haven’t completed the quotes, and hence it's happening. The correct command should be:


You can press Esc to get back > prompt.

Hope this helps.


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