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inout's are parameters passed by reference. They must already be set to a value when calling the function, and the called function may set them to a different value.

out parameters are reset to their default value at the beginning of the function, so you cannot pass data by them (and thus, you can pass uninitialized variables). inout states that value of the variable should be known to function, so it is not erased, and uninitialized variables cannot be passed.