Description

This program will explain how to make pair of elements from taking elements from
mid with elements from start alternatively.

Example 1 : arr[] = {2,7,6,3,5,9}
            After making pair the array will be
            arr[] = {2,3,7,5,6,9}
            
Example 2 :  arr[] = {7,3,9,5,4,8,6}
            After making pair the array will be
            arr[] = {7,4,3,8,9,6,5}

C/C++

/* C Program to make pair of elements alternatively */
//Save it as MakePairOfElements.c

#include<stdio.h>
int main(){

    int i, n, val1;

    printf("Enter the size of array : ");
    scanf("%d",&n);

    //Declaring the array
    int arr[n];
    //Declaring the new array to store the value from first array
    int arrNew[n];

    printf("Enter the array elements : ");
    for(i=0;i<n;i++) {
        scanf("%d",&arr[i]);
    }

    /*Dividing the array into two parts, taking upper 
    limit if size of array is odd*/
    if(n%2==0) {
        val1=(n/2);
    }else if(n%2!=0) {
        val1=((n+1)/2);
    }

    //Storing the first part of the array into new array
    for(i=0;i<val1;i++) {
        arrNew[i*2] = arr[i];
    }
    int count=1;
    //Storing the first part of the array into new array
    for(i=val1;i<n;i++) {
        arrNew[count] = arr[i];
        count = count+2;
        if(count>=n) {
            break;
        }
    }

    //Printing the final array
    printf("New array after making pair : \n");
    for(i=0;i<n;i++) {
        printf("%d ",arrNew[i]);
    }
}

Input:
Enter the size of array : 
7
Enter the array elements : 
7
3
9
5
4
8
6

Output:
New array after making pair : 
7 4 3 8 9 6 5

Java

/* Java Program to make pair of elements alternatively */
//Save it as MakePairOfElements.java

import java.io.*;
import java.util.Scanner;

public class MakePairOfElements {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Enter the size of array : ");
        int n = scanner.nextInt();
        
        //Declaring the array
        int arr[] = new int[n];
        //Declaring the new array to store the value from first array
        int arrNew[] = new int[n];
        
        System.out.println("Enter the array elements : ");
        for(int i=0;i<n;i++) {
            arr[i] = scanner.nextInt();
        }
        
        int val1=0;
        
       /*Dividing the array into two parts, taking upper
                limit if size of array is odd*/
        if(n%2==0) {
            val1=(n/2);
        }else if(n%2!=0) {
            val1=((n+1)/2);
        }
        
        //Storing the first part of the array into new array
        for(int i=0;i<val1;i++) {
            arrNew[i*2] = arr[i];
        }
        int count=1;
        //Storing the first part of the array into new array
        for(int i=val1;i<n;i++) {
            arrNew[count] = arr[i];
            count = count+2;
            if(count>=n) {
                break;
            }
        }
        
        //Printing the final array
        System.out.println("New array after making pair : ");
        for(int i=0;i<n;i++) {
            System.out.print(arrNew[i]+" ");
        }
    }
}

Input:
Enter the size of array : 
6
Enter the array elements : 
2
7
6
3
5
9

Output:
New array after making pair : 
2 3 7 5 6 9

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