c# prac6 var 18

// 1
using System;

public class Program
{

    static int exp(int i, int n)
    {
        if(i == n)
            return n;
        return i + exp(++i, n);
    }

    public static void Main()
    {
        Console.Write("count sum from 1 to m + from 1 to 2k\nEnter m = ");
        int m, k, a, b;
        m = int.Parse(Console.ReadLine());
        Console.Write("Enter k = ");
        k = int.Parse(Console.ReadLine());
        a = exp(1, m);
        b = exp(1, 2*k);
        Console.Write("{0} + {1} = {2}", a, b, (a + b));
    }
}


// 2
using System;

public class Program
{

    static void disp(int n)
    {
        if(n == 0)
            return;
        disp(--n);
        Console.Write((++n) + " ");
    }

    public static void Main()
    {
        Console.Write("natural numbers 1 .. N\nEnter N = ");
        int n = int.Parse(Console.ReadLine());
        disp(n);
    }
}