In this tutorial, we will discuss the simple concept of the Java code to calculate the average of odd and even numbers in an array.
In this article, we are going to learn how to calculate the average of odd and even numbers in the Java programming language
When any integer ends in 0,2,4,6,8 and it can be divided by two with the remainder of zero, it is called as an even number.
Example of even numbers – 34,-64,78,788 – (it can be negative and positive)
When any integer ends in 0,1,3,5,7,9 and it cannot be divided without a remainder, it is called as an odd number.
Example for odd numbers – 33,-69,75,785
Here, we can use a modular operator to find odd or even number in an array
if n%2==0, n is an even number – if the number is even, the remainder is zero.
if n%2==1, n is an odd number – if the number is odd, the remainder is one.
Program 1
This program allows the user to calculate the average of odd and even numbers in the given array using “for loop”.
public class OddEvenAvgArray2{ public static void main(String args[]){ int arr[]={14,43,59,68,71,86}; //1 int oddSum=0,evenSum=0,evenCount=0,oddCount=0; //2 for(int i=0; i<6; i++){ //3 if(arr[i]%2==0){ //4 evenSum=evenSum+arr[i]; evenCount++; } else{ //5 oddSum=oddSum+arr[i]; oddCount++; } } double avgOdd=oddSum/oddCount; //6 double avgEven=evenSum/evenCount; System.out.println("\nAverage of even numbers are: "+avgEven); //7 System.out.println("\nAverage of odd numbers are: "+avgOdd); } }
When the above code is executed, it produces the following results
Average of even numbers are:56.0 Average of odd numbers are:57.0
Method:
Program 2
This program allows the user to choose any value for array length(Number of array elements) and input values into the array. The program will calculate the Average of odd and even numbers from the list using “for loop”.
import java.util.Scanner; class OddEvenAvgArray3{ public static void main (String args[]){ int size,oddSum=0,evenSum=0,oddCount=0,evenCount=0; //1 Scanner scan=new Scanner(System.in); //create a scanner object for input System.out.print("Enter the numbers of elements: "); size=scan.nextInt(); //2 int arr[]=new int[size]; //3 System.out.print("Enter the numbers : "); //4 for(int i=0; i<size; i++){ //5 arr[i]=scan.nextInt(); } System.out.print("Enter numbers: "); for(int i=0; i<size; i++){ //6 if(arr[i]%2==0){ //7 evenSum=evenSum+arr[i]; evenCount++; } else{ //8 oddSum=oddSum+arr[i]; oddCount++; } } double avgOdd=oddSum/oddCount; //9 double avgEven=evenSum/evenCount; System.out.println("\nAverage of even numbers are: "+avgEven); //10 System.out.println("\nAverage of odd numbers are: "+avgOdd); } }
When the above code is executed, it produces the following results
Enter the number of elements:7 Enter the numbers : 100 101 102 103 104 105 106 Average of even numbers are: 103.00 Average of odd numbers are: 103.00
Method:
Program 1
This program allows the user to calculate the average of odd and even numbers in the given array using “while loop”.
public class OddEvenAvgArray1{ public static void main(String args[]){ int oddSum=0,evenSum=0,evenCount=0,oddCount=0; //1 int arr[]={13,44,58,67,70,85}; //2 int i=0; while(i<6){ //3 if(arr[i]%2==0){ //4 evenSum=evenSum+arr[i]; evenCount++; } else{ //5 oddSum=oddSum+arr[i]; oddCount++; } i++; } double avgOdd=oddSum/oddCount; //6 double avgEven=evenSum/evenCount; System.out.println("\nSum of even numbers are:"+avgEven); //7 System.out.println("\nSum of odd numbers are:"+avgOdd); } }
When the above code is executed, it produces the following results
Average of even numbers are:55.0 Average of odd numbers are:57.0
Method:
Program 2
This program allows the user to choose any value for array length(Number of array elements) and input values into the array. The program will calculate the Average of odd and even numbers from the list using “while loop“.
import java.util.Scanner; class OddEvenAvgArray4{ public static void main (String args[]){ int size,oddSum=0,evenSum=0,oddCount=0,evenCount=0; //1 Scanner scan=new Scanner(System.in); //create a scanner object for input System.out.print("Enter the numbers of elements: "); size=scan.nextInt(); //2 int arr[]=new int[size]; //3 System.out.print("Enter the numbers : "); //4 int i=0; while(i<size){ //5 arr[i]=scan.nextInt(); i++; } i=0; while(i<size){ //6 if(arr[i]%2==0){ //7 evenSum=evenSum+arr[i]; evenCount++; } else{ //8 oddSum=oddSum+arr[i]; oddCount++; } i++; } double avgOdd=oddSum/oddCount; //9 double avgEven=evenSum/evenCount; System.out.println("\nAverage of even is: "+avgOdd); //10 System.out.println("\nAverage of odd is: "+avgEven); } }
When the above code is executed, it produces the following results
Enter the number of elements:7 Enter the numbers : 15 16 17 18 19 20 Average of even numbers are: 17.00 Average of odd numbers are: 18.00
Method:
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