C program to insert an element in an array

Overview:

Before starting this article, I will give you the general overview of this article. This Article included Array Definition and Why we use an array? Moreover, I will show the Demonstration for the Insertion of elements in a specific index. and write the logic for How to insert an element at a specific index? Furthermore, I will write code for C program to insert an element in an array. After all, I will show you the work of this program with the output as the conclusion.

Table of contents:

1. What is an Array?
2. What is a index of an Array?
3. Why we use array in comparison to many variables?
4. Demonstration for Insertion of element in a specific index
5. How to insert an element at specific index?
6. C program to insert an element in an array
7. Conclusion

What is an Array?

An array is a container for the collection of items that stores these items at contiguous memory locations.

What is an index of an Array?

The index of an array is basically a pointer that is used to indicate which element in the array will be used.

Why do we use an array in comparison to many variables?

The array is a time-saving container in programming that saves time and memory storage when we write a program. Suppose, You want to store 100 numbers in memory than you will declare 100 specific variables to store it but it is a very time-consuming and lengthy process that increases the lines of code. Therefore, We will store these 100 numbers in a single variable known as an array that continuously stores it. Suppose, You want to save 1, 2, and 3 into memory.

The traditional method to store it is: 
int a=1; 
int b=2; 
int c=3; 
The alternative way to store it is as follows: int arr[3]= {1,2,3};

Demonstration for Insertion of element in a specific index.

How to insert an element at specific index?

• Step 1: First get the element to be inserted, say x
• Step 2: Then get the position at which this element is to be inserted, say pos
• Step 3: Then shift the array elements from this position to one position forward, and do this for all the other elements next to pos.
• Step 4: Insert the element x now at the position pos, as this is now empty.Take a variable and store a year into it as integer.

C program to check leap year

#include <stdio.h>
 
int main()
{
    int arr[100] = { 0 };
    int i, x, pos, n = 10;
 
    // initial array of size 10
    for (i = 0; i < 10; i++)
        arr[i] = i + 1;
    // print the original array
    for (i = 0; i < n; i++)
        printf("%d ", arr[i]);
    printf("\n");
 
    /*element to be inserted x = 50;
	position at which element is to be inserted pos = 5;
	increase the size by 1 n++; then shift elements forward*/
    for (i = n-1; i >= pos; i--)
        arr[i] = arr[i - 1];
    // insert x at pos
		arr[pos - 1] = x;
    // print the updated array
    for (i = 0; i < n; i++)
        printf("%d ", arr[i]);
    printf("\n");
    return 0;
}

Conclusion:

This Program insert 50 at 4^th index to the given array.