What is the difference between #include and #include "file" ?

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Ranganath B

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#include is meant for including standard library files, where as #include "" is for the local/ custom header files.
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Training Centre

Follow the link for the explanation : http://www.programmingprashn.com/2015/08/what-is-difference-between-include-and.html
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C/C++/SQL/Datastructures/Database/Excel

The way its picked from standard path or the path you have specified
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The difference is in the location where the preprocessor searches for the included file. For #include "filename" the preprocessor searches in the same directory as the file containing the directive. This method is normally used to include programmer-defined header files. For #include filename the...
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The difference is in the location where the preprocessor searches for the included file. For #include "filename" the preprocessor searches in the same directory as the file containing the directive. This method is normally used to include programmer-defined header files. For #include filename the preprocessor searches in an implementation dependent manner, normally in search directories pre-designated by the compiler/IDE. This method is normally used to include standard library header files. read less
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Along the path that's specified by each /I compiler option. In C++, include a file in two ways: The first one is #include which tells the preprocessor to look for the file in the predefined default location. This location is often an INCLUDE environment variable that denotes the path to include files
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Self taught programmer

we use #include for those files which are already exists in the standard library.... and we use #include"file" for those files which are not exists in standard library, but they contain some information we have to use in the next file... in which we are including them...
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Software Professional Trainer with 26+ years of Experience in Software Design and Development

I think it is incomplete question. It could be #include with angle bracket and include with double quote. #include with angle bracket will look the file in include directory which is defined in the compiler settngs. #include with double quote will look in all the directory.
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Along the path that's specified by each /I compiler option. In C++, include a file in two ways: The first one is #include which tells the preprocessor to look for the file in the predefined default location. This location is often an INCLUDE environment variable that denotes the path to include files...
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The #include method of file inclusion is often used to include standard headers such as stdio.h or stdlib.h. This is because these headers are rarely (if ever) modified, and they should always be read from your compiler's standard include file directory. The #include "file" method of file inclusion...
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The #include method of file inclusion is often used to include standard headers such as stdio.h or stdlib.h. This is because these headers are rarely (if ever) modified, and they should always be read from your compiler's standard include file directory. The #include "file" method of file inclusion is often used to include nonstandard header files that you have created for use in your program. This is because these headers are often modified in the current directory, and you will want the preprocessor to use your newly modified version of the header rather than the older, unmodified version. read less
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Programming Trainer

These are different syntax supported by different versions of compilers whereas the latest compilers supports both. (Earlier compilers does not understands the #include "file" method.
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