Discussion
In C, if you pass an array as an argument to a function, what actually gets passed?
Answer: C
Correct answer: Base address of the array
An array argument decays to a pointer to its first element, so what the function receives is the base address, not a copy of the elements. This is why passing a large array costs nothing extra, why the function can modify the caller’s data, and why sizeof inside the function returns the size of a pointer rather than of the array.
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