C# LAB at HoM 8

Write a program to calculate the factorial of the number entered by a user. Create this program by using static functions and static variables. Hint: The limit of users input should be 1-20. (Duration: 30 min)

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

namespace ConsoleApplication71
{
    class factorial
    {
        static long Facl;
        public static bool Fac(long n, out long answer)
        {
            long k;
            bool ok = true;
            if (n <= 0 || n > 20)
            {
                ok = false;
            }
            else
            {
                Facl = 1;
                for (k = 2; k <= n; ++k)
                {
                    Facl = Facl * k;
                }
                answer = Facl;
                return ok;
            }
        }
        static void Main(string[] args)
        {
            long facl;
            bool ok;
            long number;
            Console.WriteLine("enter the number for calculating factorial(1-20):");
            number = long.Parse(Console.ReadLine());
            ok = factorial.Fac(number, out facl);
            if (ok)
                Console.WriteLine("factorial(" + number + ")=" + facl);
            else
                Console.WriteLine("incorrect value");
            Console.ReadLine();
        }
    }
}

Write a program to identify the largest of three numbers entered by a user. Create this program by using methods. (Duration: 25 min)

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

namespace ConsoleApplication72
{
   public class Program
    {
       static int number1, number2, number3;
       public static void Greater()
       {
           if (number1 > number2 && number1 > number3)
           {
               Console.WriteLine("first number is the greatest:{0}", number2);
           }
           else if (number2 > number1 && number2 > number3)
           {
               Console.WriteLine("second number is the greatest:{0}", number2);
           }
           else
           {
               Console.WriteLine("this number is the greatest:{0}", number3);
           }
       }
        static void Main(string[] args)
        {
            Console.WriteLine("enter the first number");
            number1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("enter the second number");
            number2 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("enter the third number");
            number3 = Convert.ToInt32(Console.ReadLine());
            Console.ReadLine();
        }
    }
}

Predict the output of the following program:

Predict the output of the following program:
using System;
namespace Square_Number
{
class CalculateSquare
{
int number;
public void Square(int number)
{
Console.WriteLine("The number is: {0}",number);
number *= number;
Console.WriteLine("Square of 10 is: {0}", number);
}
CalculateSquare()
{
number = 10;
Square(number);
}
static void Main(string[] args)
{
CalculateSquare cal = new CalculateSquare();
Console.ReadLine();
}
}
}

Predict the output of the following program:

using System;
namespace CalculateNumber
{
class Calculate
{
static int number1;
public void Display(int number)
{
Console.WriteLine(number);
}
Calculate()
{
number1++;
Display(number1);
}
static Calculate()
{
number1 = 10;
number1++;
}
static void Main(string[] args)
{
Calculate Cal1 = new Calculate();
Calculate Cal2 = new Calculate();
Console.ReadLine();
}
}
}