Write a Java program that uses while loops to read an integer number between 20

Question

Write a Java program that uses while loops to read an integer number between 20 and 60, then the program prints out the entered value followed by (on a separate line) the sum of all even integer values between 2 and the entered number (including the entered value if even). Use a while loop to validate the user input before determining and printing the sum. In addition, design your program such it allows the user to re-run the program with a different input. Use proper labels for the outputs as shown in the examples below.

Explanation / Answer

//header files
import java.util.*;

public class HelloWorld{
   public static void main(String[] args) {
      
       // declre variables
       int sum = 0;
       int count = 2;
      
       //getting input from user
       Scanner input = new Scanner(System.in);
       System.out.println("Entered value :");
       int endNum = input.nextInt();
      
       // error message when value is less tahn 1
       if (endNum < 2) {
           System.out.println("Input value must not be less than 2");
           return ;
       }
      
       // sum of values
       while (count <= endNum) {
           sum = sum + count;
           count += 2;
       }
       // display output
       System.out.println("Sum of even numbers between 2 and " + endNum + " is: " + sum);
   }
}

sample output

Entered value :                                                                                                                                             
20                                                                                                                                                          
Sum of even numbers between 2 and 20 is: 110                                                                                                                

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