Java Program to Print Even Elements at Odd Index

This is the Java Program to Print Even Elements at Odd Index Number.

Problem Description

Given an array of integers, print the even numbers present at odd index numbers.
Example:

Array = [2,1,4,4,5,7]

Output = 4

Problem Solution

Iterate through the array, and check whether the current index is even or odd if it is odd, then check the element at that index to be even or odd, print the element if it is even.

Program/Source Code

Here is the source code of the Java Program to Print Even Elements at Odd Index Number. The program is successfully compiled and tested using IDE IntelliJ Idea in Windows 7. The program output is also shown below.

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//Java Program to Print Even Elements at Odd Index Number

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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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public class EvenIndexedOddElements {
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    // Function to even numbers present at odd index

    static void printEvenIndexedElements(int[] array){

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        int i=0;
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        for(i=0; i<array.length; i++){
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            if(i%2 != 0 && array[i]%2 ==0){

                System.out.print(array[i] + " ");

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            }
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        }
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    }
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    // Function to read input
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    public static void main(String[] args) {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

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        int size;
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        System.out.println("Enter the size of the array");

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        try {
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            size = Integer.parseInt(br.readLine());

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        } catch (Exception e) {
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            System.out.println("Invalid Input");

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            return;
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        }
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        int[] array = new int[size];
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        System.out.println("Enter array elements");

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        int i;
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        for (i = 0; i < array.length; i++) {

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            try {
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                array[i] = Integer.parseInt(br.readLine());

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            } catch (Exception e) {
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                System.out.println("An error occurred");

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                return;
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            }
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        }
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        System.out.println("Output");
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        printEvenIndexedElements(array);

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    }
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}
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Program Explanation

1. In function printEvenIndexedElements, the loop for(i=0; i<array.length; i++) is used to iterate through the array.
2. The condition if(i%2!=0 && array[i]%2==0), checks whether the current index is odd and the element at that index is even.
3. The element is printed if the above mentioned condition is true.

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Time Complexity: O(n) where n is the number of elements in the array.

Runtime Test Cases

 
Case 1 (Simple Test Case):
 
Enter the size of the array
6
Enter array elements
2
1
4
4
5
7
Output
4
 
Case 2 (Simple Test Case - another example):
 
Enter the size of the array
8
Enter array elements
12
34
45
32
76
55
567
346
Output
34 32 346

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