1.WRITE A CONSOLE PROGRAM PRIME OR NOT>

PROGRAM:
using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, i, b = 0;
            Console.WriteLine("Enter the number to check prime or not");
            a = int.Parse(Console.ReadLine());
            for (i = 2; i <= a / 2; i++)
            {
                if (a % i == 0)
                {
                 Console.WriteLine("The number " + a + " is not prime");
                    b++;
                    break;
                }
            }
            if (b == 0)
                Console.WriteLine("The number " + a + " is prime number");
        }
    }
}
OUTPUT:


2.WRITE A CONSOLE PROGROM TO TRIM A STRING>

PROGRAM:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
         string myString = "    prasun      ";
         System.Console.WriteLine("The String Before Trimming : (" + myString + ")");
         System.Console.WriteLine("The String After Trimming : (" + myString.Trim() + ")");
            Console.Read();
        }
    }
}

OUTPUT:


3.WRITE A CONSOLE PROGRAM PERFECT SQUARE OR NOT>


PROGRAM:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace EvenOdd
{
    class Program
    {
        static void Main(string[] args)
        {
            int num,sq;
            Console.WriteLine("Enter a Number to Check a Number is Perfect Square or Not");
            num = int.Parse(Console.ReadLine());
            try
            {
   sq =int.Parse(Math.Sqrt(Convert.ToDouble(num.ToString())).ToString());
   if (sq*sq==num)
  Console.WriteLine("The number " + num + " is Perfect Square Number");
            }
            catch
            {
 Console.WriteLine("The number " + num + " is not Perfect Square Number");
            }
          }
    }
}


OUTPUT:


4.WRITE A CONSOLE PROGRAM EVEN OR ODD>

PROGRAM
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            int n;
            Console.WriteLine("Enter the number");
            n = int.Parse(Console.ReadLine());
            if (n % 2 == 0)
                Console.WriteLine("The number " + n + " is an even number");
            else
                Console.WriteLine("The number " + n + " is an odd number");

        }
    }
}

OUTPUT :
5.WRITE A CONSOLE PROGRAM TO GENERATE THE SUM OF N NUMBER>

PROGRAM:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace b_to_d
{
    class Program
    {
        static void Main(string[] args)
        {
            int i, sum = 0, n;
            Console.Write("Enter the Nth Number : ");
            n = int.Parse(Console.ReadLine());
            for (i = 0; i <= n; i++)
            {
                sum = sum + i;
            }
            Console.WriteLine("\nSum of N Numbers : " + sum);
            Console.ReadLine();
        }
    }
}
OUTPUT :