Can C Functions Be Nested?

Nested Functions in C

Question: Is it possible to define functions within other functions in C ?

Answer:

Modern C (C 11 or later):

Yes, you can create nested functions using lambdas. Lambdas allow you to define anonymous functions that can capture local variables within their scope.

int main() {
    auto print_message = [](std::string message) {
        std::cout << message << "\n";
    };
    print_message("Hello!");
}

C 98 and C 03:

In C 98 and C 03, directly defining functions within functions is not supported. However, you can use the following technique:

1. Define a local class within the outer function.
2. Declare static functions within the local class.

int main() {
    struct X {
        static void a() {}
    };
    X::a();
}

While this allows you to create functions inside functions, it's considered a workaround and should be used sparingly due to its potential for obscurity in code comprehension.

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