icp/oer/courses/c-basics/sections/02-basic-language-features/05-arrays/content.html

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<p>
More often then not you need to talk about more than one
variable, a collection of data. The most simple construct to do that
is the array. The data is stored consecutively as a block.
The array is also the list data-structure with the least overhead concerning the access and is the only list data-structure, which is supported without any libraries.
</p>
<p>
To access an member of the array you use the subscript operator <b>[]</b>.
In C arrays starts at index 0 and ends at index n-1, where n is the number of members.
</p>