Complete Program

Classic programmed-learning exercises, refreshed for modern Java and presented in the current MrStyner.com portfolio style.

Modern Java noteThis archive has been refreshed for Java 25 LTS. Core language concepts remain useful, while outdated setup instructions and browser-era Java are labeled or replaced. Java 26 is the current feature release; Java 25 is used here as the stable teaching baseline.
go to previous page   go to home page   go to next page

Answer:

The completed program is given below.

Complete Program

flowchart

Here is the complete program that adds up even and odd integers from zero the limit N specified by the user:

import  java.util.Scanner;

// User enters a value N
// Add up odd integers,  
// even  integers, and all integers 1 to N
//
class AddUpIntegers
{
  public static void main (String[] args ) 
  {
    Scanner scan = new Scanner( System.in );
    int N, sumAll = 0, sumEven = 0, sumOdd = 0;

    System.out.print( "Enter limit value: " );
    N = scan.nextInt();

    int count = 1;
    while (  count <= N )    
    {
      sumAll = sumAll + count ;
      
      if ( count % 2 == 0  )
        sumEven = sumEven + count ;

      else
        sumOdd  = sumOdd  + count ;

      count = count + 1 ;
    }

    System.out.print  ( "Sum of all : " + sumAll  );
    System.out.print  ( "/tSum of even: " + sumEven );
    System.out.println( "/tSum of odd : " + sumOdd  );
  }
}

It would be odd if you did not copy and paste this program to Notepad, save it to a file, and run it. An even better idea would be to pretend you had not seen it, and to try to create it from scratch.

QUESTION 7:

Which is larger: the sum of evens or the sum of odds? Does the answer to this question change if N is even or odd?