# Arrays

> Source: https://learn-c.net/arrays/
> Part of Learn C, free to read.

Arrays are special variables which can hold more than one value under the same variable name, organised with an index. Arrays are defined using a very
straightforward syntax:

```c
/* defines an array of 10 integers */
int numbers[10];
```

Accessing a number from the array is done using the same syntax. Notice that arrays in C are zero-based, which means that if we
defined an array of size 10, then the array cells 0 through 9 (inclusive) are defined. `numbers[10]` is not an actual value.

```c
int numbers[10];

/* populate the array */
numbers[0] = 10;
numbers[1] = 20;
numbers[2] = 30;
numbers[3] = 40;
numbers[4] = 50;
numbers[5] = 60;
numbers[6] = 70;

/* print the 7th number from the array, which has an index of 6 */
printf("The 7th number in the array is %d", numbers[6]);
```

Arrays can only have one type of variable, because they are implemented as a sequence of values in the computer’s memory.
Because of that, accessing a specific array cell is very efficient.