Question

I have to write a program in java which uses while loops. 1.prompt the user to input two intergers: firstnum ans second numnumber. (first number must be smaller that the second number). 2. Output all the even numbers between first number and second number inclusive. 3. Output the sum of all the even number between first number and second number inclusive. 4 Output all the odd numbers between first number and second number inclusive. 5. Output the sum of all the odd numbers between first number and second number inclusive

Answer 1

The solution to the above question is given below with screenshot of output.

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I kept the logic simple and i have tested all outputs.

If there is anything else do let me know in comments.

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============ CODE TO COPY ===============================

main.java

 import java.util.Scanner;  // Import the Scanner class

class Main {

  public static void main(String[] args) {

    Scanner scanner = new Scanner(System.in);

    int sum_even = 0;
    int sum_odd  = 0;

    System.out.println();

    // Taking first number from user
    System.out.print("Enter first number: ");
    int first_number  = scanner.nextInt();

    // Taking second number from user
    System.out.print("Enter second number: ");
    int second_number = scanner.nextInt();
    
    // if second number if smaller ask again
    while( second_number < first_number ){

      System.out.print("Second number smaller, enter again : ");
      second_number = scanner.nextInt();

    }

    // Output all the even numbers between first number and second number inclusive
    System.out.println();
    System.out.print("Even numbers between first number and second number inclusive: ");
    for ( int i = first_number ; i <= second_number; i++){
      if ( i % 2 == 0 ){
        System.out.print(i + " ");
        sum_even += i;
      }
    }

    System.out.println();
    System.out.print("Sum of all the even number between first number and second number inclusive : ");
    System.out.print(sum_even);

    // Output all the odd numbers between first number and second number inclusive
    System.out.println();
    System.out.println();
    System.out.print("Odd numbers between first number and second number inclusive: ");
    for ( int i = first_number ; i <= second_number; i++){
      if ( i % 2 != 0 ){
        System.out.print(i + " ");
        sum_odd  += i;
      }
    }

    System.out.println();
    System.out.print("Sum of all the odd number between first number and second number inclusive :");
    System.out.println(sum_odd );

  }
}

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Output :

java version "1.8.0_31" Java(TM) SE Runtine Environnent (build 1.8.0_31-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed node) Enter first number 10 Enter second number: 18 Even numbers between first number and second number inclusive: 10 12 14 16 18 Sum of all the even number between first number and second number inclusive 70 Odd numbers between first number and second number inclusive: 11 13 15 17 Sum of all the odd number between first number and second number inclusive :56