Insert an element at specific position in an array

Posted on Apr 24, 2020

C program to insert an element at specific position in an array.

Program

#include<stdio.h>
#include<conio.h>
#define MAX 50

void read_array(int a[MAX], int n)
{
    int i;
    for(i=0;i<n;i++)
    {
        printf("Element %d\t:",i+1);
        scanf("%d",&a[i]);
    }
}

void print_array(int a[MAX], int n)
{
    int i;
    for(i=0;i<n;i++)
    {
        printf("Element %d\t:%d\n",i+1,a[i]);
    }
}

void insert(int a[MAX], int n, int num, int pos)
{
    int i;

    for(i=n-1;i>=pos-1;i--)
    {
        a[i+1] = a[i];
    }
    a[pos-1] = num;
}

void main()
{
    int arr[MAX];
    int i, n, num, pos;

    printf("Enter the number of elements in the array\t:");
    scanf("%d",&n);

    printf("Enter the elements of the array\n");
    read_array(arr, n);

    printf("Enter the element to be inserted\t:");
    scanf("%d",&num);
    printf("Enter the position at which element is to be inserted\t:");
    scanf("%d",&pos);

    if(pos>n+1)
        printf("\nElement cannot be entered at %d position",pos);
    else
    {
        insert(arr, n, num, pos);
        printf("\nModified array is\n");
        print_array(arr, n+1);
    }

    getch();
}

Output

********** Run1 ********** 

Enter the number of elements in the array       :8
Enter the elements of the array
Element 1       :12
Element 2       :23
Element 3       :45
Element 4       :56
Element 5       :78
Element 6       :89
Element 7       :85
Element 8       :52
Enter the element to be inserted        :84
Enter the position at which element is to be inserted   :5

Modified array is
Element 1       :12
Element 2       :23
Element 3       :45
Element 4       :56
Element 5       :84
Element 6       :78
Element 7       :89
Element 8       :85
Element 9       :52


********** Run2 ********** 

Enter the number of elements in the array       :5
Enter the elements of the array
Element 1       :12
Element 2       :23
Element 3       :45
Element 4       :56
Element 5       :52
Enter the element to be inserted        :58
Enter the position at which element is to be inserted   :7

Element cannot be entered at 7 position