C ARRAYS

What is an array?

An array is a sequence of values of the same type stored in contiguous memory locations. It is protyped like:

type name[size]

The <type_name> can be like:

int numbers[size]

char characters[size]

float values[size]

So, arrays:

• Size is fixed at the declaration.
• It has usage of size = *sizeof(type).
• The elements can be indexed from 0 to size - 1.

Then:

Elements contains size - 1, because if i would do:

int numbers[2] {

numbers[0] = ‘0’;

numbers[1] = ‘1’; }

Whenever i try to acess <numbers[2]> like it has been protyped, it will get undefined behavior, because the index [2] does not exist. So the first element of any array it will always be arr[0].

Initialization

Just declaration:

• int arr[3];
  • Just declares memory
  • No values are set (acess garbage memory)
  • It has to assign later

Total initialization