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It doesn't do type deduction there.

In original C you could declare variables without a type, and these variables with auto have no type.

So this "auto" is essentially saying "this variable without a type uses automatic storage". That's a completely different language feature from "deduce the type of this variable".

Thanks.

A variable without a type is 'int' so ```auto xx;``` means an int on the function local variable stack.

No, it doesn't do type deduction. Without specifying the type, it assumes a type of int. Everything in C revolves around ints.

here it means automatic storage duration