Syed Ahmed Zaki

Calling Method Example in C#

Posted on August 12, 2017 | Leave a comment

code:

with object creation from class:

using System;

namespace CallingMethods
{
    class Program
    {
       int Add(int a, int b)
       {
           int result;
           result = a + b;
           return result;
       }
        static void Main(string[] args)
        {
            int first, second;
            Console.WriteLine("1st number:");
            first=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("2nd number");
            second = Convert.ToInt32(Console.ReadLine());
            Program obj1=new Program();
            
            int result = obj1.Add(first, second);
            Console.WriteLine("The addition is: "+result);
            Console.ReadKey();
        }
    }
}

using System;

namespace CallingMethods

{

class Program

{

int Add(int a, int b)

{

int result;

result = a + b;

return result;

}

static void Main(string[] args)

{

int first, second;

Console.WriteLine("1st number:");

first=Convert.ToInt32(Console.ReadLine());

Console.WriteLine("2nd number");

second = Convert.ToInt32(Console.ReadLine());

Program obj1=new Program();

int result = obj1.Add(first, second);

Console.WriteLine("The addition is: "+result);

Console.ReadKey();

}

If we don’t want to use object we can use static keyword here:

using System;

namespace CallingMethods
{
    class Program
    {
       static int Add(int a, int b)
       {
           int result;
           result = a + b;
           return result;
       }
        static void Main(string[] args)
        {
            int first, second;
            Console.WriteLine("1st number:");
            first=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("2nd number");
            second = Convert.ToInt32(Console.ReadLine());
           
            
            int result = Add(first, second);
            Console.WriteLine("The addition is: "+result);
            Console.ReadKey();
        }
    }
}

using System;

namespace CallingMethods

{

class Program

{

static int Add(int a, int b)

{

int result;

result = a + b;

return result;

}

static void Main(string[] args)

{

int first, second;

Console.WriteLine("1st number:");

first=Convert.ToInt32(Console.ReadLine());

Console.WriteLine("2nd number");

second = Convert.ToInt32(Console.ReadLine());

int result = Add(first, second);

Console.WriteLine("The addition is: "+result);

Console.ReadKey();

}

Static method can be invoked with class name:

using System;

namespace CallingMEthods1
{
    class MyClass
    {
        public static void MyMethod()
        {
            Console.WriteLine("Showing From Method");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            MyClass.MyMethod();
            Console.ReadKey();
        }
    }
}

using System;

namespace CallingMEthods1

{

class MyClass

{

public static void MyMethod()

{

Console.WriteLine("Showing From Method");

}

class Program

{

static void Main(string[] args)

{

MyClass.MyMethod();

Console.ReadKey();

}

Can be invoked without creating objects:

using System;

namespace CallingMEthods1
{
    class Program 
    {
        public static void MyMethod()
        {
            Console.WriteLine("Showing From Method");
        }
    
        static void Main(string[] args)
        {
            MyMethod();
            Console.ReadKey();
        }
    }
}

using System;

namespace CallingMEthods1

{

class Program

{

public static void MyMethod()

{

Console.WriteLine("Showing From Method");

}

static void Main(string[] args)

{

MyMethod();

Console.ReadKey();

}

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Posted in C#

Tagged C sharp, OOP

Data Structure in C#

Posted on August 7, 2017 | Leave a comment

ArrayList Implementation Example:

using System;
using System.Collections;

namespace ArrayListIntroApp
{
    class Program
    {
        static void Main(string[] args)
        {
            ArrayList ourArrayList = new ArrayList();
            ourArrayList.Add("Hello World");
            ourArrayList.Add(12);
            ourArrayList.Add(true);
            ourArrayList.Add(124.2);
            ourArrayList.Add('A');

            foreach (var i in ourArrayList)
            {
                Console.WriteLine(i);
            }

            Console.ReadKey();
        }
    }
}

using System;

using System.Collections;

namespace ArrayListIntroApp

{

class Program

{

static void Main(string[] args)

{

ArrayList ourArrayList = new ArrayList();

ourArrayList.Add("Hello World");

ourArrayList.Add(12);

ourArrayList.Add(true);

ourArrayList.Add(124.2);

ourArrayList.Add('A');

foreach (var i in ourArrayList)

{

Console.WriteLine(i);

}

Console.ReadKey();

}

ArrayList example:

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

namespace ListIntroApp
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> ourList=new List<string>();

            ourList.Add("Hello");
            ourList.Add("World");
            ourList.Add("BDjobs");
            ourList.Add("BAtch 06");
            ourList.Add("BDBL Bhaban");
            ourList.Add("Level 19");
            ourList.Add("Kawran Bazar");
            //ourList.Sort();
            //ourList.Reverse();
            ourList.RemoveRange(1,3);
          //  ourList.Remove("Hello");
          //  Console.WriteLine(ourList.Remove("Hello"));
            
            foreach (string item in ourList)
            {
                Console.WriteLine(item);
            }
            Console.ReadKey();
        }
    }
}

using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ListIntroApp

{

class Program

{

static void Main(string[] args)

{

List<string> ourList=new List<string>();

ourList.Add("Hello");

ourList.Add("World");

ourList.Add("BDjobs");

ourList.Add("BAtch 06");

ourList.Add("BDBL Bhaban");

ourList.Add("Level 19");

ourList.Add("Kawran Bazar");

//ourList.Sort();

//ourList.Reverse();

ourList.RemoveRange(1,3);

// ourList.Remove("Hello");

// Console.WriteLine(ourList.Remove("Hello"));

foreach (string item in ourList)

{

Console.WriteLine(item);

}

Console.ReadKey();

}

Stack:

using System;
using System.Collections.Generic;

namespace stack
{
    class Program
    {
        static void Main(string[] args)
        {
            Stack<int> ourStack=new Stack<int>();
            ourStack.Push(23);
            ourStack.Push(123);
            ourStack.Push(1);
            ourStack.Push(777);
            ourStack.Push(76);
            int[] ourArray = ourStack.ToArray();
            //Console.WriteLine(ourStack.Pop());
            //Console.WriteLine(ourStack.Pop());
            //Console.WriteLine(ourStack.Pop());
            //Console.WriteLine("Top Value: "+ourStack.Peek());
            Console.WriteLine(ourStack.Count);
            Console.WriteLine("Values in Array:");
            foreach (int item in ourArray)
            {
                Console.WriteLine(item);
            }
            Console.ReadKey();
        }
    }
}

using System;

using System.Collections.Generic;

namespace stack

{

class Program

{

static void Main(string[] args)

{

Stack<int> ourStack=new Stack<int>();

ourStack.Push(23);

ourStack.Push(123);

ourStack.Push(1);

ourStack.Push(777);

ourStack.Push(76);

int[] ourArray = ourStack.ToArray();

//Console.WriteLine(ourStack.Pop());

//Console.WriteLine("Top Value: "+ourStack.Peek());

Console.WriteLine(ourStack.Count);

Console.WriteLine("Values in Array:");

foreach (int item in ourArray)

{

Console.WriteLine(item);

}

Console.ReadKey();

}

Queue:

HashMap

Dicitionary:

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Posted in C#

Playing with C#

Posted on August 3, 2017 | Leave a comment

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

namespace for_loop
{
    class Program
    {

        static void Main(string[] args)
        {
            
//            Display();
            int firstNumber = Convert.ToInt32(Console.ReadLine());
            int secondNumber = Convert.ToInt32(Console.ReadLine());

            int result = Add(firstNumber,secondNumber);
            Console.WriteLine(result);
            Console.ReadKey();
        }

       static int Add(int firstNumber, int secondNumber)
        {
            int result = firstNumber + secondNumber;
            return result;
        }

        static void Display()
        {
            Console.WriteLine("Hello World");
        }
    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace for_loop

{

class Program

{

static void Main(string[] args)

{

// Display();

int firstNumber = Convert.ToInt32(Console.ReadLine());

int secondNumber = Convert.ToInt32(Console.ReadLine());

int result = Add(firstNumber,secondNumber);

Console.WriteLine(result);

Console.ReadKey();

}

static int Add(int firstNumber, int secondNumber)

{

int result = firstNumber + secondNumber;

return result;

}

static void Display()

{

Console.WriteLine("Hello World");

}

Clean Code:

using System;

namespace HelloWorld
{
    class Program
    {
        static void Main(string[] args)
        {
            string takingInputFrom = Console.ReadLine();
            string greeting = "Good Morning" + takingInputFrom;
            Console.WriteLine(greeting);
            Console.ReadLine();
        }
    }
}

using System;

namespace HelloWorld

{

class Program

{

static void Main(string[] args)

{

string takingInputFrom = Console.ReadLine();

string greeting = "Good Morning" + takingInputFrom;

Console.WriteLine(greeting);

Console.ReadLine();

}

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Posted in C#

Swap without a temp variable

Posted on August 1, 2017 | Leave a comment

It’s possible with addition:

#include<iostream>
using namespace std;

int main(){

int x=10,y=15;
cout<<"Before swapping: x="<<x<<"y="<<y<<endl;
x=x+y; //25
y=x-y; //25-15=10
x=x-y; //25-10=15

cout<<"After swapping: x="<<x<<"y="<<y<<endl;
return 0;
}

#include<iostream>

using namespace std;

int main(){

int x=10,y=15;

cout<<"Before swapping: x="<<x<<"y="<<y<<endl;

x=x+y; //25

y=x-y; //25-15=10

x=x-y; //25-10=15

cout<<"After swapping: x="<<x<<"y="<<y<<endl;

return 0;

}

It’s also possible with multiplication:

#include<iostream>
using namespace std;

int main(){

int x=10,y=15;
cout<<"Before swapping: x="<<x<<"y="<<y<<endl;
x=x*y; //25
y=x/y; //25-15=10
x=x/y; //25-10=15

cout<<"After swapping: x="<<x<<"y="<<y<<endl;
return 0;
}

#include<iostream>

using namespace std;

int main(){

int x=10,y=15;

cout<<"Before swapping: x="<<x<<"y="<<y<<endl;

x=x*y; //25

y=x/y; //25-15=10

x=x/y; //25-10=15

cout<<"After swapping: x="<<x<<"y="<<y<<endl;

return 0;

}

Source:
http://www.geeksforgeeks.org/swap-two-numbers-without-using-temporary-variable/

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Posted in A ll Codes, ACM Technique

Functional and Non-functional Requirement Software Engineering

Posted on July 30, 2017 | Leave a comment

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Posted in Software Development, Software Development Life Cycle(SDLC)

C# Windows Application Form

Posted on July 28, 2017 | Leave a comment

code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PersonalInformationApp
{
    public partial class MainUI : Form
    {
        public MainUI()
        {
            InitializeComponent();
        }

        private string firstName, lastName, fathersName, mothersName, address;

        private void AddressButton_click(object sender, EventArgs e)
        {
            MessageBox.Show(address);

        }

        private void parentsButton_click(object sender, EventArgs e)
        {
            fathersNameTextBox.Text = fathersName;
            mothersNameTextBox.Text = mothersName;
            MessageBox.Show("Fathers Name: " + fathersName + "\n" + "Mothers Name: " + mothersName);
        }

        private void saveButton_Click(object sender, EventArgs e)
        {
            firstName = firstNameTextBox.Text;
            lastName = lastNameTextBox.Text;
            fathersName = fathersNameTextBox.Text;
            mothersName = mothersNameTextBox.Text;
            address = addressTextBox.Text;

            firstNameTextBox.Text = "";
            lastNameTextBox.Clear();
            fathersNameTextBox.Text=string.Empty;
            mothersNameTextBox.Text = string.Empty;
            addressTextBox.Text = null;
        }

        private void showAllInformationButton_Click(object sender, EventArgs e)
        {
            firstNameTextBox.Text = firstName;
            lastNameTextBox.Text = lastName;
            fathersNameTextBox.Text = fathersName;
            mothersNameTextBox.Text = mothersName;
            addressTextBox.Text = address;
        }

        private void nameButton_Click(object sender, EventArgs e)
        {
            MessageBox.Show(firstName+" "+lastName);
        }

      
    }
}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace PersonalInformationApp

{

public partial class MainUI : Form

{

public MainUI()

{

InitializeComponent();

}

private string firstName, lastName, fathersName, mothersName, address;

private void AddressButton_click(object sender, EventArgs e)

{

MessageBox.Show(address);

}

private void parentsButton_click(object sender, EventArgs e)

{

fathersNameTextBox.Text = fathersName;

mothersNameTextBox.Text = mothersName;

MessageBox.Show("Fathers Name: " + fathersName + "\n" + "Mothers Name: " + mothersName);

}

private void saveButton_Click(object sender, EventArgs e)

{

firstName = firstNameTextBox.Text;

lastName = lastNameTextBox.Text;

fathersName = fathersNameTextBox.Text;

mothersName = mothersNameTextBox.Text;

address = addressTextBox.Text;

firstNameTextBox.Text = "";

lastNameTextBox.Clear();

fathersNameTextBox.Text=string.Empty;

mothersNameTextBox.Text = string.Empty;

addressTextBox.Text = null;

}

private void showAllInformationButton_Click(object sender, EventArgs e)

{

firstNameTextBox.Text = firstName;

lastNameTextBox.Text = lastName;

fathersNameTextBox.Text = fathersName;

mothersNameTextBox.Text = mothersName;

addressTextBox.Text = address;

}

private void nameButton_Click(object sender, EventArgs e)

{

MessageBox.Show(firstName+" "+lastName);

}

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Posted in C#

Tagged C sharp

Posted on July 23, 2017 | Leave a comment

code:

LinearSearch(Array A, value)
{
BEGIN
    for i=0 to A.length-1
        if(A[i]==value) then
            return i;
        end if
    end for
    return -1 //if desired value not found return -1
END
}

LinearSearch(Array A, value)

{

BEGIN

for i=0 to A.length-1

if(A[i]==value) then

return i;

end if

end for

return -1 //if desired value not found return -1

END

}

#include<bits/stdc++.h>
using namespace std;

int LinearSearch(int *A,int n,int x)
{
    int i;
    for(i=0; i<n; i++)
    {
        if(A[i]==x)
            return i;
    }
    return -1;
}

int main()
{
    int x,i,n;
    int A[5] = {3,5,9,8,16};
    printf("Put value to search from an array: ");
    scanf("%d",&x);
    int output=LinearSearch(A,5,x);
    if(output==-1)
    {
        printf("%d is not found",x);
    }
    else
    {
        printf("%d is in index %d\n",x,output);
    }


    return 0;
}

#include<bits/stdc++.h>

using namespace std;

int LinearSearch(int *A,int n,int x)

{

int i;

for(i=0; i<n; i++)

{

if(A[i]==x)

return i;

}

return -1;

}

int main()

{

int x,i,n;

int A[5] = {3,5,9,8,16};

printf("Put value to search from an array: ");

scanf("%d",&x);

int output=LinearSearch(A,5,x);

if(output==-1)

{

printf("%d is not found",x);

}

else

{

printf("%d is in index %d\n",x,output);

}

return 0;

}

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Posted in Uncategorized

OOP Topics Need To Cover

Posted on July 20, 2017 | Leave a comment

https://www.javacodegeeks.com/2017/05/oops-concepts-need-know.html

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Posted in OO Analysis and Design, OOP

Different Types of Object Diagram

Posted on July 17, 2017 | Leave a comment

http://creately.com/blog/diagrams/uml-diagram-types-examples/

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Posted in Object Notation

Agile vs Waterfall

Posted on July 16, 2017 | Leave a comment

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Posted in Software Development Life Cycle(SDLC)

OOP in C#

Posted on July 14, 2017 | Leave a comment

Calculator.cs

namespace ConsoleApp6.Math

{
    public class Calculator
    {
        public int Add(int a,int b)
        {
            return a + b;
        }
    }
}

namespace ConsoleApp6.Math

{

public class Calculator

{

public int Add(int a,int b)

{

return a + b;

}

Program.cs

using ConsoleApp6.Math;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp6
{
    class Program
    {
        static void Main(string[] args)
        {
            Person john = new Person();
            john.FirstName = "John";
            john.LastName = "Smith";
            john.Introduce();

            Calculator calculator = new Calculator();
            var result = calculator.Add(1, 2);
            System.Console.WriteLine(result);
        }
    }
}

using ConsoleApp6.Math;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApp6

{

class Program

{

static void Main(string[] args)

{

Person john = new Person();

john.FirstName = "John";

john.LastName = "Smith";

john.Introduce();

Calculator calculator = new Calculator();

var result = calculator.Add(1, 2);

System.Console.WriteLine(result);

}

Person.cs

using System;

namespace ConsoleApp6
{
    public class Person
    {
        public string FirstName;
        public string LastName;

        public void Introduce()
        {
            Console.WriteLine("My name is:"+FirstName+" "+LastName);
        }
    }
}

using System;

namespace ConsoleApp6

{

public class Person

{

public string FirstName;

public string LastName;

public void Introduce()

{

Console.WriteLine("My name is:"+FirstName+" "+LastName);

}

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Posted in C#, OOP

UML

Posted on July 13, 2017 | Leave a comment

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Posted in Object Notation

C# Book Tips

Posted on July 12, 2017 | Leave a comment

9 months ago

What is the best way to learn c# ? Ebooks or those four or five hour long seminars about it?

9 months ago

okay thanks for the advice

3 months ago (edited)

I see it was about 5 months since you asked the question and might have learned it already, As for ebooks Id suggest C# 6.0 in a nutshell, compared to all the other books ive read its the best with more explanations than the other books. I think that is the key to force yourself to answer questions and do excercises and tasks. The greatest mistake people make is not writing enough code and then use all the tools of C# to make that code work, write really redundant code and forget about elegancy in the start. I would NOT learn about their store apps in depth, only to use C# and see it visually. Forget about XAML and all that stuff. Its super time consuming, complex, no compiler to help you out, the documentation is really bad. During all the time I learned I started writing a game and added features / adding more useless code to the game so that I can learn the c# syntax and features, practicing solid principles. Oh yeah, pluralsight.com is really good, dotnetperls.com, stackoverflow.com, the microsoft documentation(I suggest learning how to read that documentation) and a few guys on youtube like kudvenkat and Jamie King helped me out alot.