C# Program to Check Odd Number

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What are Odd Numbers?

An integer (never a fraction) that cannot be divided exactly by 2. For example, 3 is an odd number, i.e., 3 % 2 = 1 (not zero).

Note: % is a Modulus (Division Remainder) operator, it finds the remainder after division of one number by another. Please check our Arithmetic Operators for more details.

Tips: It is recommended to use our online Odd Numbers calculator for better understanding.

Using For Loop

In the following example, we will find all the Odd Numbers between 10 and 25 using for loop.

Example

C# Compiler
using System; namespace myApp { class Program { static void Main(string[] args) { int start = 10; int end = 25; Console.WriteLine("Odd numbers between {0} and {1}: ", start, end); for(start=start; start<=end; start++) { if(start % 2 != 0) Console.Write(start +" "); } } } }

Using While Loop

In the following example, we will find all the Odd Numbers between 10 and 25 using while loop.

Example

C# Compiler
using System; namespace myApp { class Program { static void Main(string[] args) { int start = 10; int end = 25; Console.WriteLine("Odd numbers between {0} and {1}: ", start, end); while(start <= end) { if(start % 2 != 0) Console.Write(start +" "); start++; } } } }

Using do while Loop

In the following example, we will find all the Odd Numbers between 10 and 25 using do while loop.

Example

C# Compiler
using System; namespace myApp { class Program { static void Main(string[] args) { int start = 10; int end = 25; Console.WriteLine("Odd numbers between {0} and {1}: ", start, end); do{ if(start % 2 != 0) Console.Write(start +" "); start++; }while(start <= end); } } }

Odd Numbers between any Given Range

In the following example, we will find all the Odd numbers between any given range.

Example

C# Compiler
using System; namespace myApp { class Program { static void Main(string[] args) { Console.Write("Enter a (int) starting number: "); int start = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter an (int) ending number: "); int end = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("\nOdd numbers between {0} and {1}: ", start, end); for(start=start; start<=end; start++) { if(start % 2 != 0) Console.Write(start +" "); } } } }

Check Whether the Given Number is Odd or Even

In the following example, we will check whether the given number is an Odd number or Even number.

Example

C# Compiler
using System; namespace myApp { class Program { static void Main(string[] args) { Console.Write("Enter a (int) number: "); int num = Convert.ToInt32(Console.ReadLine()); if(num % 2 == 0) Console.WriteLine("{0} is an even number", num); else Console.WriteLine("{0} is an odd number", num); } } }

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