Prime Numbers in C# with Examples:
————————————————————
number that should be greater than 1 and it only is divided by 1 and itself. For example, 2, 3, 5, 7, 11, 13, 17, 19, 23…., are the prime numbers.

How to check if a given number is prime or not in C#?:
———
using System;
namespace LogicalPrograms
{
public class Program
{
static void Main(string[] args)
{
Console.Write("Enter a Number : ");
int number = int.Parse(Console.ReadLine());
bool IsPrime = true;
for (int i = 2; i < number/2; i++)
{
if (number % i == 0)
{
IsPrime = false;
break;
}
}
if (IsPrime)
{
Console.Write("Number is Prime.");
}
else
{
Console.Write("Number is not Prime.");
}
Console.ReadKey();
}
}
}
————————————output———————————-
Enter a number 19
Number is Prime


Prints the Prime Numbers between a range of numbers in C#?:-
——————-
using System;
namespace LogicalPrograms
{
public class Program
{
static void Main(string[] args)
{
Console.Write("Enter The Start Number: ");
int startNumber = int.Parse(Console.ReadLine());
Console.Write("Enter the End Number : ");
int endNumber = Convert.ToInt32(Console.ReadLine());
Console.WriteLine($"The Prime Numbers between {startNumber} and {endNumber} are : ");
for (int i = startNumber; i <= endNumber; i++)
{
int counter = 0;
for (int j = 2; j <= i / 2; j++)
{
if (i % j == 0)
{
counter++;
break;
}
}

if (counter == 0 && i != 1)
{
Console.Write("{0} ", i);
}
}
Console.ReadKey();
}
}
}
————————————————output——————-
Enter the start number:1
enter the end number:20
The prime numbers between 1 and 20 are:
2 3 5 7 11 13 17 19

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