DaWei

The first thing you can't do is define a function inside another function. That's what this message is telling you:
Move that definition BELOW (or ABOVE) main, it doesn't get to be inside. Inside is where you CALL the effer.

Fix that, and come back if you're still fuzzled.

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Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code.
Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers