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Why do arrays start at 0?

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Re: Why do arrays start at 0?

#701

Post by iopq » Wed, Sep 07, 2022, 6:21 PM UTC

foobarbaz33 wrote: post #694

iopq wrote: post #688

Earlier quoted context omitted.

Allowed in Rust: https://play.rust-lang.org/?version=stable&mode=debug&editio... it's an array of length 0, but it can't be "used" because it has a length of 0 so it occupies no RAM

> An array of length 0 starts at 0 and ends with 0 But such an array does not "start" at 0 as it does not exist. You need an array of at least length-1 to "start" at 0.

I can write a loop like this:

`for(int i=0; i < 0; ++i)` and it will run 0 times, the exact amount of times I expected

Re: Why do arrays start at 0?

#702

Post by foobarbaz33 » Sat, Sep 10, 2022, 2:04 PM UTC

iopq wrote: post #701

foobarbaz33 wrote: post #694

Earlier quoted context omitted.

> An array of length 0 starts at 0 and ends with 0 But such an array does not "start" at 0 as it does not exist. You need an array of at least length-1 to "start" at 0.

I can write a loop like this: `for(int i=0; i < 0; ++i)` and it will run 0 times, the exact amount of times I expected

But again your not starting at "index 0" of an array that exists.

This loop is not processing any physically existing array. In fact the compiler would remove this block of code as it is a no-op.

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