Array in C programming

Published on : 2nd Oct 2021
Why do we need array ?
When we have 1000 variables of same type, it is impossible do declare them one by one. For this, we need array.
Definition :
An array is a collection of similar types of elements. Array elements are stored in contiguous memory locations.
Array declaration :
We have to declare the type of array and dimension of array.
Example : 
int arr[5];
Here, array data type is integer and dimension is 5.
Array declaration with initialization :
Syntax : int arr[5] = {10, 20, 30, 40, 50};
Indexing in array : 
Array index starts with 0. arr[0] will give you 10. We can assign a value in an array cell like arr[0] = 11. Now the array is {11, 20, 30, 40, 50}.
Visualization of array :

Source Code :
#include <stdio.h>

int main(int argc, char** argv)
{
	int arr[5] = {10, 20, 30, 40, 50};
	arr[0] = 11;
	printf("Array elements :");
	int i;
	for(i=0; i<5; i++)
	{
		printf(" %d", arr[i]);
	}
	return 0;
}
Output :
Array elements : 11 20 30 40 50