Design a flowchart and write the corresponding program that prompts the user to enter an integer, and then displays a message indicating whether this number is odd or even.

Solution

In this exercise, you need to find a way to determine whether a number is odd or even. You need to find a common attribute between all even numbers, or between all odd numbers. And actually there is one! All even numbers are exactly divisible by 2. So, when the result of the operation X MOD 2 equals 0 (zero), X is even; otherwise, X is odd.

Next you can find various odd and even numbers:

  • Odd numbers: 1, 3, 5, 7, 9, 11, …
  • Even numbers: 0, 2, 4, 6, 8, 10, 12, ….

Notice: Please note that zero is considered an even number.

The flowchart is shown here.

and the program is shown here.

PHP

<?php
  echo "Enter an integer: ";
  $x = trim(fgets(STDIN));
  
  if ($x % 2 == 0) {
    echo "Even";
  }
  else {
    echo "Odd";
  }
?>

Java

public static void main(String[] args) throws java.io.IOException {
  java.io.BufferedReader cin = new java.io.
          BufferedReader(new java.io.InputStreamReader(System.in));
  int x;

  System.out.print("Enter an integer: ");
  x = Integer.parseInt(cin.readLine());
  
  if (x % 2 == 0) {
    System.out.println("Even");
  }
  else {
    System.out.println("Odd");
  }
}

C++

#include <iostream>
using namespace std;
int main() {
  int x;

  cout << "Enter an integer: ";
  cin >> x;
  
  if (x % 2 == 0) {
    cout << "Even" << endl;
  }
  else {
    cout << "Odd" << endl;
  }
  return 0;
}

C#

static void Main() {
  int x;

  Console.Write("Enter an integer: ");
  x = Int32.Parse(Console.ReadLine());
  
  if (x % 2 == 0) {
    Console.WriteLine("Even");
  }
  else {
    Console.WriteLine("Odd");
  }

  Console.ReadKey();
}

Visual Basic

Sub Main()
  Dim x As Integer

  Console.Write("Enter an integer: ")
  x = Console.ReadLine()

  If x Mod 2 = 0 Then
    Console.WriteLine("Even")
  Else
    Console.WriteLine("Odd")
  End If

  Console.ReadKey()
End Sub

Python

x = int(input("Enter an integer: "))

if x % 2 == 0:
    print("Even")
else:
    print("Odd")

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