37 lines
1.2 KiB
Markdown
37 lines
1.2 KiB
Markdown
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---
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title: C++ Arrays
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---
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## What are Arrays?
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An array is a series of elements of the same data type which are stored in contiguous memory locations and can be referenced individually.
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For example, a array containing 5 integer values called numbers is declared like so:
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```C++
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int numbers [5];
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```
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Initializiation:
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```C++
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//Initialization with entries:
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int numbers [5] = {1, 2, 3, 4, 5};
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//Initialization with no values:
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int numbers [5] = {};
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//Initialization with declaration:
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int numbers [] = {1, 2, 3, 4, 5};
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//Note that here the number of values defines the size of the array.
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//In the examples above, the size was fixed beforehand
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```
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**Note** that arrays in C++ are not permutable in size, which means that once you've declared a array with size 5 it cant be enlarged or made smaller. In case you really need a bigger array with the same entries, you would have to copy all entries to a new array of bigger size.
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### Access:
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Elements from an array can be accessed via reference of theire position in the array. (Start counting from 0).
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Example:
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```C++
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x = numbers[0]; // = 1. [0] == first position
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numbers[2] = 55; // Sets the third position (3) to the new number 55
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//numbers[] is now: {1, 2, 55, 4, 5}
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```
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