What are Odd Numbers? | Maths Explanation for C# Kids
Odd numbers are numbers that are not divisible by 2.
They include:
In this beginner-friendly Maths C# tutorial for kids, we'll explore how to list odd numbers
using C# loops and conditions - perfect for primary school students learning to code.
To generate odd numbers in C#, we use a 'while' loop combined with a conditional statement.
This simple C# exercise will help you understand number patterns and logic.
Create a new C# class file; Project, Add Class.
Call it OddNumbers.
Type out the adjoining C# code for listing odd numbers.
Note: You can comment out the EvenNumbers C# object code in the main class from the previous lesson or simply continue from where it stopped.
Code for Odd Number List with User Input in C#
For a little more flexibility, let's add an input form to our C# code for odd numbers.
All we need is a way to ask the user for input.
For this purpose, we'll use the Console.ReadLine()
C# library function.
So! C# Fun Practice Exercise - List Odd Numbers
As a fun practice exercise, feel free to try out your own boundary values, and see how the C# code lists the odd numbers between those boundary values.
C# Code for Odd Numbers class.
namespace Arithmetic
{
class OddNumbers
{
private int start; // Our starting point
private int stop; // where we will stop
private List<int> list_of_primes; // We will house our gathered prime numbers here.
// Our constructor
public OddNumbers(int first, int last)
{
start = first;
stop = last;
list_of_primes = new List<int>();
}
public List<int> prepResult()
{
/*
* Loop from start to stop and rip out even numbers;
*/
while (start <= stop)
{
if (start % 2 != 0)
{
list_of_primes.Add(start);
}
start++; // increase 'start' by 1
}
return list_of_primes;
}
}
}
C# Code for Odd Numbers - Main class.
using System.Collections.Generic;
namespace Arithmetic
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Welcome to our demonstration sequels");
Console.WriteLine("Hope you enjoy (and follow) the lessons.");
Console.WriteLine("");
/* Use the Even Number class. */
int first = 1;
int last = 100;
List<int> answer;
OddNumbers odd_data = new OddNumbers(first, last); // odd numbers between 1 and 100
answer = odd_data.prepResult();
Console.WriteLine("Odd numbers between " + first + " and " + last + " are:");
Console.WriteLine(String.Join(", ", answer));
}
}
}
C# Code for Odd Numbers - Main class for Collecting Input.
using System.Collections.Generic;
namespace Arithmetic
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Welcome to our demonstration sequels");
Console.WriteLine("Hope you enjoy (and follow) the lessons.");
Console.WriteLine("\r\n");
/*
* Collect input.
*/
int first;
int last;
List<int> answer;
string collect_input; // For collecting user input
Console.Write("Enter your start number: ");
collect_input = Console.ReadLine();
first = int.Parse(collect_input); // Convert it to integer
Console.Write("Enter your stop number: ");
collect_input = Console.ReadLine();
last = int.Parse(collect_input);
// Use the Odd Number class.
OddNumbers odd_input = new OddNumbers(first, last);
answer = odd_input.prepResult();
Console.WriteLine("Odd numbers between " + first + " and " + last + " are:");
Console.WriteLine(String.Join(", ", answer));
}
}
}