Web Reference: Mar 27, 2025 · In C programming, nested functions are not allowed. We can only define a function globally. Example: Output. 4 | void fun(){ | ^ 7 | fun(); | ^ The above code gives error because defining a function inside another function is not possible in C programming language. Apr 9, 2010 · You can define a single publicly visible function that implements some complex logic by relying one or more nested functions to break the problem into smaller, logical pieces. In C language, defining a function inside another one is not possible. In short, nested functions are not supported in C. A function may only be declared (not defined) within another function. When a function is declared inside another function, it is called lexical scoping.
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