C When To Use Extern

C When To Use Extern. Want to learn from the best curated videos and practice problems, check out the C. So, extern "C" simply tells linker to use C naming instead of C++ mangled ones.

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It's not the compilers job to know where it exists, it just It is useful when you share a variable between a few modules. The keyword [ extern "C" ] is used to declare functions in C++ which is implemented and compiled in C language. extern has additional meaning in C++ when used as: [math]extern "C"[/math]. External variables are also known as global variables.

Use of extern with C functions:- By default, the declaration and definition of a C function have "extern" prepended with them.

External variables are also known as global variables.

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An extern is something that is defined externally to the current module. The keyword [ extern "C" ] is used to declare functions in C++ which is implemented and compiled in C language. extern has additional meaning in C++ when used as: [math]extern "C"[/math]. It means even though we don't use extern with the declaration/definition of C functions, it is present there.

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