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`void (*ptr)()` defines a function pointer. It says that `ptr` is a pointer to a function. But that function must have a `void` return type, and take no parameters (that's what the empty parentheses defines).
Then, `ptr = PrintHello` assigns the `PrintHello` function to the `ptr` pointer (and it works because `PrintHello` matches the signature: it has a `void` return type and takes no parameters). So, now `ptr` is pointing to `PrintHello`.
Finally, `ptr()` is calling the function that `ptr` points to (in this case, `PrintHello`). It has the same effect as calling `PrintHello()`, and the parentheses are needed because it's a function call. But the function takes no parameters, thus the empty parentheses.

`void (*ptr)()` defines a function pointer. It says that `ptr` is a pointer to a function. But that function must have a `void` return type, and take an arbitrary number of parameters (that's what the empty parentheses defines).
Then, `ptr = PrintHello` assigns the `PrintHello` function to the `ptr` pointer (and it works because `PrintHello` matches the signature: it has a `void` return type). So, now `ptr` is pointing to `PrintHello`.
Finally, `ptr()` is calling the function that `ptr` points to (in this case, `PrintHello`). It has the same effect as calling `PrintHello()`, and the parentheses are needed because it's a function call. But the function takes no parameters, thus the empty parentheses.

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