using System;

using System.Numerics;

namespace ConsoleApplication2

{

class Program

    {

static void Main(string[] args)

        {

int a, b, c;

Console.Write("a=");

string s1 = Console.ReadLine();

            a = Convert.ToInt32(s1);

Console.Write("b=");

string s2 = Console.ReadLine();

            b = Convert.ToInt32(s2);

            c = a + b;

string s3 = Convert.ToString(c);

string s4 = c.ToString();

Console.WriteLine("c=" + s3 + " " + s4);

BigInteger silnia = 1;

// decimal silnia = 1;

checked

            {

for (int i = 1; i <= 500; i++)

{

                    silnia = silnia * i;

                }

Console.WriteLine(silnia);

}

float x = 1.0f;

for (float i = -x; i < x; i += 0.1f)

            {

Console.WriteLine(i);

if (i == 0)

Console.WriteLine("zero");

            }

decimal y = 1.0m;

for (decimal i = -y; i < y; i += 0.1m)

            {

Console.WriteLine(i);

if (i == 0)

Console.WriteLine("zero");

            }

double d1 = 3.912387491, d2 = 8.23948759823;

Console.WriteLine("text {0:F2} {1:F5}", d1, d2);

Console.WriteLine($"text {d1:F2} {d2:F5}");

Console.WriteLine($"tex\t {d1:F2} \r\n {d2:F5}");

Console.WriteLine($@"tex\t  {d1:F2} \r\n  {d2:F5}");

Console.ReadLine();

        }

    }

}