How to Write a Java Program Using a While Loop to Calculate the Sum of the First Hundred Even and Odd Numbers

In this guide, we will delve into the process of creating a Java program that uses a while loop to calculate the sum of the first 100 even and odd numbers. This example will be particularly useful for beginners in programming, helping them understand loops, conditions, and basic arithmetic operations in Java.

The Basic Concept

The goal is to initialize two variables to keep track of the sum of even and odd numbers. We will use a while loop to iterate through the first 100 numbers and determine whether each number is even or odd based on the remainder when divided by 2 (using the modulo operator %).

Step-by-Step Implementation

To begin, let's initialize the variables for the sum of even and odd numbers:

public class SummationOfEvensOdds {    public static void main(String[] args) {        int sumOdd  0;        int sumEven  0;        int count  1;        Scanner sc  new Scanner();        // Placeholder for input handling    }}

Implementing the While Loop

The core logic of the program resides within the while loop:

while(count  100) {    if(count % 2  0) {        sumEven   count;    } else {        sumOdd   count;    }    count  ;}

In this example, the count variable is used to represent the current number being checked. The if statement checks whether the count is divisible by 2 (even) or not (odd) based on the remainder of the division operation.

Putting It All Together

public class SummationOfEvensOdds {    public static void main(String[] args) {        int sumOdd  0;        int sumEven  0;        int count  1;        Scanner sc  new Scanner();        while(count  100) {            if(count % 2  0) { // Check if even                sumEven   count;            } else { // If its not even its odd                sumOdd   count;            }            count  ;        }        ("Sum of the first 100 even numbers: "   sumEven);        ("Sum of the first 100 odd numbers: "   sumOdd);    }}

This program will output the sum of the first 100 even and odd numbers. Additionally, the count and Scanner initialization are included for completeness, although they are not strictly necessary for the core logic in this example.

Summary and Best Practices

Creating a program to calculate the sum of even and odd numbers using a while loop is a fundamental exercise for understanding loops and conditional statements in Java. Here are some tips and best practices:

Educational Value: This example provides a clear and concise way to understand how loops and conditions work together. Modularity: Consider breaking down the code into methods for better readability and reusability. Input Validation: In more complex applications, ensure to handle user input effectively and validate inputs to prevent runtime errors.

By following these guidelines and using this example as a foundation, you can build a solid understanding of core programming concepts in Java and enhance your skills.

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