Introduction of Arrays


An array is a variable that can store multiple values. For example, if you want to store 100 integers, you can create an array for it.

int data[100];

How to declare an array?

dataType arrayName[arraySize];

For example,

float mark[5];

Here, we declared an array, mark, of floating-point type. And its size is 5. Meaning, it can hold 5 floating-point values.

It’s important to note that the size and type of an array cannot be changed once it is declared.

Access Array Elements

You can access elements of an array by indices.

Suppose you declared an array mark as above. The first element is mark[0], the second element is mark[1] and so on.

C Array declaration
Declare an Array

Few keynotes:

  • Arrays have 0 as the first index, not 1. In this example, mark[0] is the first element.
  • If the size of an array is n, to access the last element, the n-1 index is used. In this example, mark[4]
  • Suppose the starting address of mark[0] is 2120d. Then, the address of the mark[1] will be 2124d. Similarly, the address of mark[2] will be 2128d and so on.
    This is because the size of a float is 4 bytes.

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