frequently asking logical program in interviews for dotnet fresher
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace factorialno
{
class Program
{
public static void Main()
{
Console.Write("Enter a Number : ");
int num;
num = Convert.ToInt32(Console.ReadLine());
int k;
k = 0;
for (int i = 1; i <= num; i++)
{
if (num % i == 0)
{
k++;
}
}
if (k == 2)
{
Console.WriteLine("Entered Number is a Prime Number and the Largest Factor is {0}", num);
}
else
{
Console.WriteLine("Not a Prime Number");
}
Console.ReadLine();
}
}
}
Outut screen:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace factorialno
{
class Program
{
public static void Main()
{
Console.Write("Enter a Number : ");
int num;
num = Convert.ToInt32(Console.ReadLine());
int k;
k = 0;
for (int i = 1; i <= num; i++)
{
if (num % i == 0)
{
k++;
}
}
if (k == 2)
{
Console.WriteLine("Entered Number is a Prime Number and the Largest Factor is {0}", num);
}
else
{
Console.WriteLine("Not a Prime Number");
}
Console.ReadLine();
}
}
}
Outut screen:

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