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Vardemo

using System;
class vardemo
{
    static void Main(string[] args)
    {
        int x, y, z;
        System.Console.Write("Enter the Value x:");
        x = int.Parse(System.Console.ReadLine());
        System.Console.Write("Enter the value y:");
        y=int.Parse(System.Console.ReadLine());
        z = x + y;
        System.Console.WriteLine("Sum of {0} & {1} is :{2}",x,y,z);
        System.Console.ReadLine();
    }
}


IfDemo

using System;
namespace Sample_Programs
{
    class IfDemo
    {
        static void Main(string[] args)
        {
            int x, y;
            Console.WriteLine("Enter the values of X:");
            x=int.Parse(Console.ReadLine());
            Console.WriteLine("Enter the value of Y:");
            y=int.Parse(Console.ReadLine());
            if (x>y)
                Console.WriteLine("X is greater");
            else if (x<y)
                Console.WriteLine("Y is grater");
            else
                Console.WriteLine("Both are Equal");
            Console.ReadLine();
        }
    }
}

SwitchDemo

using System;

namespace Sample_Programs
{
    class SwitchDemo
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter The Student Number(1-3):  ");
            int sno=int.Parse(Console.ReadLine());
            switch (sno)
            {
                case 1:
                    Console.WriteLine("Student number is 1");
                    break;
                case 2:
                    Console.WriteLine("Student Number is 2");
                    break;
                case 3:
                    Console.WriteLine("Student Number is 3");
                    break;
                default:
                    Console.WriteLine("wrong Entered");
                    break;
            }
            Console.ReadLine();
        }
    }
}
Single Dimensional Array
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Sample_Programs
{
    class SDArray
    {
        static void Main(string[] args)
        {
            int[] arr = new int[5];
            arr[0] = 10; arr[1] = 20; arr[2] = 30; arr[3] = 40; arr[4] = 50;
            for (int i = 0; i < 5; i++)
                Console.Write(arr[i]+" ");
            Console.WriteLine();
            foreach (int i in arr)
                Console.WriteLine(i+" ");
            Console.WriteLine();
            Console.ReadLine();
        }
    }
}
Single Dimensional Array2
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Sample_Programs
{
    class SDArray2
    {
        static void Main(string[] args)
        {
            int[] arr = { 12, 45, 2, 4, 21,44,454,55,7,754};
           
            for (int i = 0; i < arr.Length; i++)
                Console.Write(arr[i]+" ");
            Console.WriteLine();
            Console.WriteLine("\n");

            Array.Sort(arr);
            foreach (int i in arr)
                Console.Write(i+" ");
            Console.WriteLine();
            Console.WriteLine("\n");

            Array.Reverse(arr);
            foreach (int i in arr)
                Console.Write(i + " ");
            Console.WriteLine();
            Console.WriteLine("\n");

            int[] brr=new int[10];
            Array.Copy(arr,brr,5);
            foreach (int i in arr)
                Console.Write(i + " ");
            Console.WriteLine();
            Console.ReadLine();
           
        }
    }
}
Two Dimensional Array
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace Sample_Programs
{
    class TDArray
    {
        static void Main(string[] args)
        {
            int[,] arr = new int[4, 5];
            int x = 5;
           
            //Assigning values to 2D Array
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                {
                    arr[i, j] = x;
                    x += 5;
                }
            }
            //Printing values of 2D Array
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                {
                    Console.Write(arr[i,j]+" ");
                   
                }
                Console.WriteLine();
            }
            Console.ReadLine();
        }
    }
}

Febonacci Series

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

namespace Sample_Programs
{
    class feb
    {
        static void Main(string[] args)
        {
            int i = 0, j = 0, sum = 1, n;
            Console.WriteLine("Enter the n value:   ");
            n=int.Parse(Console.ReadLine());
            while (sum < n)
            {
                Console.WriteLine("Febonacci Series: "+sum);
                i = j;
                j = sum;
                sum = i + j;
            }
            Console.ReadLine();
        }
    }
}

Interface

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

namespace Sample_Programs
{
    class Interface:Interface1,Interface2
    {
        public void add(int x, int y)
        {
            Console.WriteLine("Addition of x,y:  "+(x+y));
        }
        public void sub(int x, int y)
        {
            Console.WriteLine("Subtraction of x,y:  " + (x - y));
        }
       
        public void mul(int x, int y)
        {
            Console.WriteLine("Multiplication of x,y:  " + (x * y));
        }
        public void div(int x, int y)
        {
            Console.WriteLine("Division of x,y:  " + (x / y));
        }
        void Interface1.test()
        {
            Console.WriteLine("Interface1 is Tested");
        }
        void Interface2.test()
        {
            Console.WriteLine("Interface2 is Tested");
        }
        static void Main(string[] args)
        {
            Interface c=new Interface();
            c.add(15, 25); c.sub(45, 25); c.mul(15, 25); c.div(35, 25); Interface1 i1 = c; Interface2 i2 = c; i1.test();
             i2.test();
            Console.ReadLine();
        }
    }
}

Interface1

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

namespace Sample_Programs
{
    interface Interface1
    {
        void add(int x, int y);
        void sub(int x, int y);
        void test();
    }
}

Interface2

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

namespace Sample_Programs
{
    interface Interface2
    {
        void mul(int x, int y);
        void div(int x, int y);
        void test();
    }
}

MatrixMultiplication

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

namespace Sample_Programs
{
    class MatrixMultiplication
    {
        static void Main(string[] args)
        {
            int[,] a = new int[2, 2];
            int[,] b = new int[2, 2];
            int[,] n = new int[2, 2];
           
            for (int i = 0; i < a.GetLength(0); i++)
            {
                for (int j = 0; j < a.GetLength(1); j++)
                {
                    Console.WriteLine("Enter 1st Matrix: ");
                    a[i, j] = Convert.ToInt32(Console.ReadLine());
                }
            } Console.WriteLine();


            for (int i = 0; i < b.GetLength(0); i++)
            {
                for (int j = 0; j < b.GetLength(1); j++)
                {
                    Console.WriteLine("Enter 2st Matrix: ");
                    b[i, j] = Convert.ToInt32(Console.ReadLine());
                }
            } Console.WriteLine();

           
            Console.WriteLine("Matrix 1: ");
            for (int i = 0; i < a.GetLength(0); i++)
            {
                for (int j = 0; j < a.GetLength(1); j++)
                {
                    Console.Write(a[i, j] + " ");
                } Console.WriteLine();
            }

           
            Console.WriteLine("Matrix 2: ");
            for (int i = 0; i < b.GetLength(0); i++)
            {
                for (int j = 0; j < b.GetLength(1); j++)
                {
                    Console.Write(b[i, j] + " ");
                } Console.WriteLine();
            }

            Console.WriteLine("Matrix1*Matrix2:  ");
            for (int i = 0; i < n.GetLength(0); i++)
            {
                for (int j = 0; j < n.GetLength(1); j++)
                {
                    n[i, j] = 0;
                    for (int k = 0; k < a.GetLength(1); k++)
                    {
                       
                        n[i, j] =n[i,j] + a[i, k] * b[k, j];

                    } Console.Write(n[i, j] + " ");
                } Console.WriteLine();

            }

            Console.ReadLine();
        }
    }
}

Numberpyramid

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

namespace Sample_Programs
{
    class Numberpyramid
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the number of star lines you wish to print");
            int n = Convert.ToInt32(Console.ReadLine());

            for (int i = 0; i < n; i++)
            {
                int stars = 1 + 2 * (i);
                int space = n - i;
                for (int j = 0; j < space; j++)
                {
                    Console.Write("  ");
                }

                for (int k = 0; k < stars; k++)
                {
                    Console.Write(i + 1 + " ");
                }
                Console.WriteLine();
            } Console.ReadLine();
        }         
    }
}


//output:
//Enter the number of star lines you wish to print
//3
//   1
// 2 2 2
//3 3 3 3 3

PolymorphismDemo

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

namespace Sample_Programs
{
    class PolymorphismDemo
    {
        public void show()
        {
            Console.WriteLine();
        }
        public void show(int x)
        {
            Console.WriteLine(x);
        }
        public void show(string s)
        {
            Console.WriteLine(s);
        }
        public void show(int x,string s)
        {
            Console.WriteLine(x+"   "+s);
        }
        public void show(string s, int x)
        {
            Console.WriteLine(s+"   "+x);
        }
        static void Main(string[] args)
        {
            Console.WriteLine();
            PolymorphismDemo d=new PolymorphismDemo();
            d.show();d.show(5);d.show("effone Tech");d.show(10,"effone");d.show("effone",10);
            Console.ReadLine();
        }
    }
}
pyramid
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Sample_Programs
{
    class pyramid
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the n:");
            int n = Convert.ToInt32(Console.ReadLine());
            int k = 1;

            for (int i = 1; i <= n; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write(k + " ");
                    k = k + 1;
                }
                Console.WriteLine(" ");
            } Console.ReadLine();
        }
    }
}

Rectangle:figure

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

namespace Sample_Programs
{
    public class Rectangle:figure
    {
        public Rectangle(double width, double height)
        {
            this.width = width;
            this.height = height;
        }
        public override double GetArea()
        {
            return(width*height) ;
        }
        public override double GetPerimeter()
        {
            return 2*(width+height);
        }
        static void Main()
        {
            Rectangle r = new Rectangle(100.00,50.56);

            Console.WriteLine("Area of rectangle is:  "+r.GetArea());
            Console.WriteLine("\n");
            Console.WriteLine("Perimeter of rectangle is:  "+r.GetPerimeter());
            Console.ReadLine();
        }
    }
}
StarAlphaDemo
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Sample_Programs
{
    class StarAlpha
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the number N:");
            int n = int.Parse(Console.ReadLine());
           
            for (int i = 0; i < n; i++)
            {
                int stars = 1 + 2 * (i);
                int spaces = n - i;
                if (i == 4)
                {
                    for (int j = 0; j < spaces; j++)
                    {
                        Console.Write("  ");
                    }

                    Console.WriteLine("u m a m a h e s h");
                }
                else
                {
                    for (int j = 0; j < spaces; j++)
                    {
                        Console.Write("  ");
                    }

                    for (int k = 0; k < stars; k++)
                    {
                       Console.Write("*" + " ");
                    }
                    Console.WriteLine();
                }
            }
            Console.ReadLine();
        }
    }
}

StarPyramid

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

namespace Sample_Programs
{
    class StarPyramid
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the number of * lines you wish to print");
            int n = Convert.ToInt32(Console.ReadLine());

            for (int i = 0; i < n; i++)
            {
                int stars = 1 + 2 * (i);
                int space = n - i;
                for (int j = 0; j < space; j++)
                {
                    Console.Write("  ");
                }

                for (int k = 0; k < stars; k++)
                {
                    Console.Write("*" + " ");
                }
                Console.WriteLine();
            }
            Console.ReadLine();
        }
    }
}


//output:
//Enter the number of star lines you wish to print
//3
//   *
// * * *
//* * * * *
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