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I write a program by DevC++ compiler and save it by .cpp format, and want to paste the code in my editor, Do I have to paste all the code each time? Is there a way to include the file instead of copying and pasting the code over and over? I suppose there should be a way because for a program of about 100 lines the including the file is more convenient.

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You are probably looking for lstinputlisting. Just do a quick search here on the site: tex.stackexchange.com/search?q=lstinputlisting –  topskip Jan 31 '12 at 10:50
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up vote 13 down vote accepted

Normally this is done using the listings package. It provides a lstlisting environment for verbatim code and also a \lstinputlisting[<options,...>]{<file name>} to include an external file verbatim. As options you can select language=C++ to get specific syntax highlighting. I also usually use basicstyle=\ttfamily. See the listings package manual for more details.

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I actually use this package , all I didn't know was how include my c++ file instead of pasting the code each time . –  Negin Jan 31 '12 at 12:31
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