Notes

In Program.cs file write the below code:
1)

namespace ConsoleApp1
{
public class Program
{
public static void Main()
{
Rectangle obj = new Rectangle();
obj.SetWidth(5);
obj.SetHeight(10);
Console.WriteLine("Are of the Rectangle is {0}", obj.GetArea());
}
}

class Shape
{
public int width;
public int height;
public void SetWidth(int w)
{
width = w;
}
public void SetHeight(int h)
{
height = h;
}
}
class Rectangle: Shape
{
public int GetArea()
{
return width * height;
}
}
}







2)


namespace ConsoleApp1
{
public class Program
{
public static void Main()
{
Employee emp = new Employee();
emp.GetDeptName();
emp.GetDeptLoc();
emp.GetFirstName();
emp.GetLastName();
}
}

class Department
{
public void GetDeptName()
{
Console.WriteLine("This is Department name");
}
public void GetDeptLoc()
{
Console.WriteLine("This is Department location");
}
}
class Employee: Department
{
public void GetFirstName()
{
Console.WriteLine("This is First name");
}
public void GetLastName()
{
Console.WriteLine("This is Last name");
}
}
}



3)

namespace ConsoleApp1
{
public class Program
{
public static void Main()
{
Sedan obj = new Sedan();
obj.GetVehicleName();
obj.GetCarName();
obj.GetSedanName();
}
}

class Vehicle
{
public void GetVehicleName()
{
Console.WriteLine("This is Vehicle name");
}
}
class Car: Vehicle
{
public void GetCarName()
{
Console.WriteLine("This is the Car name");
}
}
class Sedan : Car
{
public void GetSedanName()
{
Console.WriteLine("This is the sedan name");
}
}
}




4)

namespace ConsoleApp1
{
public class Program
{
public static void Main()
{
Sprite sp = new Sprite();
CocaCola co = new CocaCola();
Pepsi pe = new Pepsi();
sp.GetcoldDrink();
sp.GetSprite();
co.GetcoldDrink();
co.GetCocaCola();
pe.GetcoldDrink();
pe.GetPepsi();


}
}

class ColdDrink
{
public void GetcoldDrink()
{
Console.WriteLine("This is a Cold drink name");
}
}
class Sprite : ColdDrink
{
public void GetSprite()
{
Console.WriteLine("This is a Sprite");
}
}
class CocaCola : ColdDrink
{
public void GetCocaCola()
{
Console.WriteLine("This is a CocaCola");
}
}

class Pepsi : ColdDrink
{
public void GetPepsi()
{
Console.WriteLine("This is a Pepsi");
}
}
}




5)


namespace ConsoleApp1
{
public class Program
{
public static void Main()
{
Animal a1 = new Dog();
a1.Sing();
a1.Greet();
}
}
public class Animal
{
public Animal()
{
Console.WriteLine("Animal Constructor");

}
public void Greet()
{
Console.WriteLine("Animal says Hello");
}
public virtual void Sing()
{
Console.WriteLine("Animal song");
}
}

public class Dog : Animal
{
public Dog()
{
Console.WriteLine("Dog constructor");
}
public override void Sing()
{
Console.WriteLine("Dog song");
}
}

}






6)

namespace ConsoleApp1
{
public class Program
{
public static void Main()
{
Department d1 = new Employee();
d1.GetDeptName();
}
}
public class Department
{
public Department()
{
Console.WriteLine("Dept Constructor");
}
public virtual void GetDeptName()
{
Console.WriteLine("Dept name is DET");
}
}

public class Employee : Department
{
public Employee()
{
Console.WriteLine("Employee constructor");
}
public override void GetDeptName()
{
Console.WriteLine("I am in DET Department");
}
}

}



7) Reverse of a String

namespace ConsoleApp1
{
public class Reverse
{
public static void Main()
{
string str = " ";
string rev = " ";
int length=0;
Console.WriteLine("Enter a String");
str = Console.ReadLine();
length = str.Length - 1;
while (length >= 0) {
rev = rev + str[length];
length--;
}
Console.WriteLine("Reversed String is {0}", rev);
Console.ReadLine();

}
}

}



8)
namespace ConsoleApp1
{
public class Reverse
{
public static void Main()
{
Console.WriteLine("Enter Your first name");
String str1 = Console.ReadLine();
Console.WriteLine("Enter Your last name");
String str2 = Console.ReadLine();
Console.WriteLine(str2 + " " + str1);
}
}

}


9)
namespace ConsoleApp1
{
// Method Overloading
public class Program
{
public static void Main()
{
TestData dataClass = new TestData();
int add1 = dataClass.Add(45, 34, 67);
int add2 = dataClass.Add(23, 34);
int sub1 = dataClass.Sub(500, 200, 100);
int sub2 = dataClass.Sub(500, 200);
int mul1 = dataClass.Mul(10, 20, 20);
int mul2 = dataClass.Mul(10, 10);
int div = dataClass.Div(10, 2);
}
}

public class TestData
{
public int Add(int a, int b, int c)
{
return a + b + c;
}
public int Add(int a, int b)
{
return a + b;
}
public int Sub(int a, int b, int c)
{
return a - b - c;
}
public int Sub(int a, int b)
{
return a - b;
}
public int Mul(int a, int b, int c)
{
return a * b * c;
}
public int Mul(int a, int b)
{
return a * b;
}
public int Div(int a, int b)
{
return a / b;
}
}

}




10)

namespace ConsoleApp1
{
public interface IEmployee
{
public void GetName();
}
public class Employee : IEmployee
{
public void GetName()
{
Console.WriteLine("My name is Saptarshi Roy");
}
}
}


public class Program
{
public static void Main()
{
Employee employee = new Employee();
employee.GetName();
}
}





11)


namespace ConsoleApp1
{

abstract class AbsClass
{
public int AddTwoNumbers(int num1, int num2)
{
return num1 + num2;
}
public abstract int MultiplyTwoNumbers(int num1, int num2);
}

class Absderived : AbsClass
{
public override int MultiplyTwoNumbers(int num1, int num2)
{
return num1 * num2;

}
static void Main(String[] args)
{
Absderived calculate = new Absderived();
int added = calculate.AddTwoNumbers(10, 20);
int multiplied = calculate.MultiplyTwoNumbers(10, 20);
Console.Write("Added : {0}, Multiplied : {1}", added, multiplied);

}
}
}



12)

namespace ConsoleApp1
{

abstract class Payment
{
public void ComputeLoan()
{
Console.WriteLine("This is the Compute Loan method");
}
public abstract void ComputePrivateLoan();
public abstract void ComputeGovtLoan();
}

class PaymentDerived : Payment
{
public override void ComputePrivateLoan()
{
Console.WriteLine("This is the Compute Private Loan method");

}
public override void ComputeGovtLoan()
{
Console.WriteLine("This is the Compute Govt Loan method");

}
static void Main(String[] args)
{
Payment calculate = new PaymentDerived();
calculate.ComputePrivateLoan();
calculate.ComputeGovtLoan();


}
}
}



13)
namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
int a = 0, nofword = 1, b = 0;
string str;
Console.WriteLine("Enter a String");
str = Console.ReadLine();
while(a <= str.Length-1)
{
if (str[a] ==' ')
{
nofword++;
b++;
}
a++;
}
Console.WriteLine("Number of Word in the sentence is {0}", nofword);
//Console.WriteLine("Number of letters in the sentence are {0}", str.Count(char.IsLetter));
Console.WriteLine("Number of letters in the sentence are {0}", a-b);
}
}
}



14)
namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
int j = 5;
switch(j)
{
case 5:
Console.WriteLine(5);
break;
case 10:
Console.WriteLine(10);
break;
case 15:
Console.WriteLine(15);
break;
default:
Console.WriteLine(100);
break;
}
}
}
}



15)
namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
int i = 20;
if (i == 10)
Console.WriteLine("i is 10");
else if (i == 15)
Console.WriteLine("i is 15");
else if (i == 20)
Console.WriteLine("i is 20");
else
Console.WriteLine("i is not present");

}
}
}



16)
namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
int x = 21;
do
{
Console.WriteLine("Do While Loop");
}
while (x < 20);

}
}
}


17) Array List

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
ArrayList My_array = new ArrayList();
My_array.Add('S');
My_array.Add('A');
My_array.Add('P');
My_array.Add('T');
My_array.Add('A');
My_array.Add('R');
My_array.Add('S');
My_array.Add('H');
My_array.Add('I');

//Console.WriteLine("initial number of elements :" + My_array.Count);


//My_array.Remove('P');
//Console.WriteLine("After Remove() method the" + "number of elements: " + My_array.Count);


//My_array.RemoveAt(4);
//Console.WriteLine("After Remove() method the" + "number of elements: " + My_array.Count);

My_array.RemoveRange(1, 3);
Console.WriteLine("After RemoveRange() method the" + "number of elements: " + My_array.Count);


//My_array.Clear();
//Console.WriteLine("After Count() method the" + "number of elements: " + My_array.Count);
}
}
}



18)
namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
var arlist = new ArrayList()
{
1,
"Bill",
300,
4.5f
};

int firstElement = (int)arlist[0];
string secondElement = (string)arlist[1];
Console.WriteLine("First Element: {0}, Second Element: {1}", firstElement, secondElement);
}
}
}


19)

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
List<int> primenumbers = new List<int>();
primenumbers.Add(1);
primenumbers.Add(3);
primenumbers.Add(5);
primenumbers.Add(7);

List<int> numbers = new List<int>() { 1, 2, 5, 7, 8, 10 };
//Console.WriteLine(numbers[0]);
//Console.WriteLine(numbers[1]);
//Console.WriteLine(numbers[2]);
//Console.WriteLine(numbers[3]);

//using for loop
//for (int i = 0; i < numbers.Count; i++)
// Console.WriteLine(numbers[i]);

//using for each loop
//foreach (var number in numbers)
// Console.WriteLine(number);

numbers.ForEach(num => Console.Write(num + ","));
}
}
}

20)

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
var numbers = new List<int>() { 10, 20, 30, 40, 10 };
numbers.Remove(10); // removes the first 10 from a list
numbers.RemoveAt(2); // removes the 3rd element (index starts from 0)
foreach (var el in numbers)
Console.WriteLine(el);
}
}
}


21) Remove not necessary elements from the array

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
string[] arr = { "0", "1", "false", "2", "null", "3" };
for(int i=0;i<arr.Length;i++)
{
try
{
int val;
val = int.Parse(arr[i]);
Console.WriteLine(" " + val + " ");
}
catch
{

}
}
}
}
}


22) Reverse of an array without using reverse function

namespace ConsoleApp1
{

public class Program
{
public static void Main(string[] args)
{
Console.WriteLine("Enter the size of array");
int size = Convert.ToInt32(Console.ReadLine());
int[] arr = new int[size];
int[] arr1 = new int[size];
int j = size;
Console.WriteLine("Enter values in the Array: ");
for(int i=0;i<arr.Length;i++)
{
arr[i] = Convert.ToInt32(Console.ReadLine());
}
for (int i = 0; i < arr.Length; i++)
{
arr[j - 1] = arr1[i];
j--;
}
Console.WriteLine("The Final array is: ");
for (int k = 0; k < arr.Length; k++)
{
Console.WriteLine(arr1[k]+" ");
}
Console.ReadLine();

}
}
}



23) To find a specific element in the array

namespace ConsoleApp1
{

public class Program
{
public static void Main(string[] args)
{
Console.WriteLine("Enter the size of array");
int size = Convert.ToInt32(Console.ReadLine());
int[] arr = new int[size];
Console.WriteLine("Enter values in the Array: ");
for(int i=0;i<arr.Length;i++)
{
arr[i] = Convert.ToInt32(Console.ReadLine());
}
Console.WriteLine("Enter the value to be searched in the array: ");
int n = Convert.ToInt32(Console.ReadLine());
int pos=-1;
for (int i = 0; i < arr.Length; i++)
{
if (arr[i] == n)
{
pos = i;
break;
}
}
if(pos==-1)
{
Console.WriteLine("Element is not present in the array");
}
else
{
Console.WriteLine("Element is present in the array");
}
}
}
}


24) To Check Whether the last Character of a Word is A or not

namespace ConsoleApp1
{

public class Program
{
public static int lastCharacter(string s)
{
int n = s.Length;
if (s[n - 1] == 'A' || s[n - 1] == 'a')
return 1;
else
return 0;
}
public static void Main()
{
string s = "Joshna";
int check = lastCharacter(s);
if (check == 1)
Console.WriteLine("Equal");
else
Console.WriteLine("Not Equal");
}
}
}



25) Wordlength Converter

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
string[] arr1 = { "hello", "world", "of" };
int[] arr2 = new int[arr1.Length];
for(int i=0;i<arr1.Length;i++)
{
arr2[i] = arr1[i].Length;
}
foreach(int i in arr2)
{
Console.WriteLine(i);
}

}

}
}


26) Sorted List

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
// Creating a sortedlist
// Using SortedList class
SortedList my_slist1 = new SortedList();

//Adding key/value pairs in
// SortedList using Add() method
my_slist1.Add(1.02, "This");
my_slist1.Add(1.07, "Is");
my_slist1.Add(1.04, "SortedList");
my_slist1.Add(1.01, "Understanding");

foreach(DictionaryEntry pair in my_slist1)
{
Console.WriteLine("{0} and {1}", pair.Key, pair.Value);
}
Console.WriteLine();
}

}
}


27) Here the key is a string but it will sort as well

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
// Creating another sortedlist
// using Object Initializer Syntax
SortedList my_slist2 = new SortedList()
{
{"b.09",234 },
{"b.11",395 },
{"b.01",405 },
{"b.67",100 } };

foreach(DictionaryEntry pair in my_slist2)
{
Console.WriteLine("{0} and {1}", pair.Key, pair.Value);
}
}

}
}


28) Using Remove and RemoveAt in Sortedlist

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
// Creating a sortedlist
// Using SortedList class
SortedList my_slist1 = new SortedList();

//Adding key/value pairs in
// SortedList using Add() method
my_slist1.Add(1.02, "This");
my_slist1.Add(1.07, "Is");
my_slist1.Add(1.04, "SortedList");
my_slist1.Add(1.01, "Understanding");

foreach (DictionaryEntry pair in my_slist1)
{
Console.WriteLine("{0} and {1}", pair.Key, pair.Value);
}
Console.WriteLine();

//Remove & RemoveAt
my_slist1.Remove(1.07);
my_slist1.RemoveAt(2);

foreach (DictionaryEntry pair in my_slist1)
{
Console.WriteLine("{0} and {1}", pair.Key, pair.Value);
}

}

}
}


29) ContainsKey() and ContainsValue() method in Sortedlist

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
// Creating a sortedlist
// Using SortedList class
SortedList my_slist1 = new SortedList();

//Adding key/value pairs in
// SortedList using Add() method
my_slist1.Add(1.02, "This");
my_slist1.Add(1.07, "Is");
my_slist1.Add(1.04, "SortedList");
my_slist1.Add(1.01, "Understanding");

foreach (DictionaryEntry pair in my_slist1)
{
Console.WriteLine("{0} and {1}", pair.Key, pair.Value);
}
Console.WriteLine();

// Using ContainsKey() method to check
// the specified key is present or not

if(my_slist1.ContainsKey(1.02)==true)
{
Console.WriteLine("Key is found...!!");
}
else
{
Console.WriteLine("Key is found...!!");
}

// Using ContainsValue() method o check
//the specified value is present or not
if(my_slist1.ContainsValue("Is")==true)
{
Console.WriteLine("Value is found...!!");
}
else
{
Console.WriteLine("value is not found....!!");
}

}

}
}


30) Creating a Dictionary

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
// Creating a Dictionary
// Using Dictionary<TKey, TValue> class
Dictionary<int, string> My_dict1 = new Dictionary<int, string>();

// Adding key/value pairs in
// the Dictionary
// Using Add() method
My_dict1.Add(1123,"Welcome");
My_dict1.Add(1124, "to");
My_dict1.Add(1125, "Dictionary");

foreach (KeyValuePair<int,string> ele1 in My_dict1)
{
Console.WriteLine("{0} and {1}", ele1.Key, ele1.Value);
}
Console.WriteLine();

}

}
}

31) ContainsKey() and ContainsValue() method in Dictionary

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
// Creating a Dictionary
// Using Dictionary<TKey, TValue> class
Dictionary<int, string> My_dict1 = new Dictionary<int, string>();

// Adding key/value pairs in
// the Dictionary
// Using Add() method
My_dict1.Add(1123,"Welcome");
My_dict1.Add(1124, "to");
My_dict1.Add(1125, "Dictionary");

foreach (KeyValuePair<int,string> ele1 in My_dict1)
{
Console.WriteLine("{0} and {1}", ele1.Key, ele1.Value);
}
Console.WriteLine();

// Using ContainsKey() method to check
// the specified key is present or not
if(My_dict1.ContainsKey(1123)==true)
{
Console.WriteLine("Key is found.....!!");
}
else
{
Console.WriteLine("Key is not found.....!!");
}

// Using ContainsValue() method to check
// the specified value is present or not
if (My_dict1.ContainsValue("Welcome") == true)
{
Console.WriteLine("value is found.....!!");
}
else
{
Console.WriteLine("Value is not found.....!!");
}

}

}
}


32) Creation of a Stack

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
// Create a Stack
// Using Stack class
Stack my_stack = new Stack();

// Adding elements in the stack
// Using Push method
my_stack.Push("Item1");
my_stack.Push("Item2");
my_stack.Push("Item3");
my_stack.Push("Item4");

Console.WriteLine("Total elements present in" + "my_stack: {0}", my_stack.Count);

my_stack.Pop();
// After pop method
// LIFO - Last in First Out
Console.WriteLine("Total elements present in" + "my_stack: {0}", my_stack.Count);
foreach(string val in my_stack)
{
Console.WriteLine(val);
}

// Remove all the elements
// from the stack
my_stack.Clear();
Console.WriteLine("Total elements present in" + "my_stack: {0}", my_stack.Count);
}

}
}

33) Creation of a Queue, Adding elements and Removing Elements

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
// Create a Queue
// Using Queue class
Queue my_queue = new Queue();

// Adding elements in the queue
// Using Enqueue method
my_queue.Enqueue("Item1");
my_queue.Enqueue("Item2");
my_queue.Enqueue("Item3");
my_queue.Enqueue("Item4");
my_queue.Enqueue("Item5");
Console.WriteLine("Contents of my_queue are: ");
foreach(string val in my_queue)
{
Console.WriteLine(val);
}
Console.WriteLine("Total elements present in" + "my_queue: {0}", my_queue.Count);

my_queue.Dequeue();
// After Dequeue method
Console.WriteLine("Total elements present in" + "my_queue: {0}", my_queue.Count);
Console.WriteLine("After Dequeue The elements in the queue: ");
foreach (string val in my_queue)
{
Console.WriteLine(val);
}
Console.WriteLine();
// Remove all the elements
// from the stack
my_queue.Clear();
Console.WriteLine("Total elements present in" + "my_queue after Dequeue: {0}", my_queue.Count);
}

}
}


34) Multiplication Table of a Number

namespace ConsoleApp1
{

public class Program
{
public static void Main()
{
int n;
Console.WriteLine("Input the number: ");
n = Convert.ToInt32(Console.ReadLine());
for(int i=1;i<=10;i++)
{
Console.WriteLine("{0} * {1} = {2}", n, i, n * i);
}

}

}
}


35)

namespace ConsoleApp1
{

public class Program
{
public static bool test(string str)
{
int counter = 0;
for (int i = 0; i < str.Length;i++)
{
if (str[i]=='z')
{
counter++;
}
}
return counter > 1 && counter <= 4;
}
public static void Main()
{
Console.WriteLine(test("frizz"));
Console.WriteLine(test("zname"));
Console.WriteLine(test("Zazz"));
Console.WriteLine(test("false"));
Console.WriteLine(test("zzzz"));

}

}
}