Newbeginner interact with classes

Question

1.00/5 (1 vote)

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Hello People

I am trying to understand how the classes works in c#.
I have made following code below, my issue is how do I print "hello" from the outputclass.

see code below:

C#

using System;
//NAMESPACE
namespace Lesson
{

    class Program
    {
        public static void Main()
        {

            //Alert my Printstring

        }
    }

    class Outputclass
    {
        string myString;


        public void PrintString()
        {
            Console.WriteLine("Hello!");
        }

        public Outputclass(string inputString)
        {
            myString = inputString;
        }
    }
}

Could someone help me?

Thank you in advance

Posted 15-Nov-15 23:30pm

Daniel Elmnas

Updated 15-Nov-15 23:37pm

Garth J Lancaster

v2

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8 solutions

Solution 1

C#

using System;
//NAMESPACE
namespace Lesson
{

class Program
{
public static void Main()
{

 Outputclass o=new Outclass();
 o.PrintString();

 Console.Readline(); 
}
}

class Outputclass
{
string myString;


public void PrintString()
{
Console.WriteLine("Hello!");
}

public Outputclass(string inputString)
{
myString = inputString;
}
}
}

Posted 15-Nov-15 23:41pm

sanjay243657

Solution 2

you need to

1) instantiate/create an object of type Outputclass - in your 'main'
2) call the PrintString() method of the object you instantiated at (1)

(it seems a bit pointless to be creating the object of type Outputclass with a string, you dont use the string, but lets get past the first hurdle)

so, how do you do point (1) .. hint, lookup the 'new' keyword

Posted 15-Nov-15 23:42pm

Garth J Lancaster

Solution 3

Create an instance of Outputclass and then call the print method.

Outputclass opc = new Outputclass();
opc.PrintString();

You would do this in the main method.

Posted 15-Nov-15 23:45pm

Abhinav S

v2

Solution 4

you need to create an object of class Outputclass in main()

C#

class Program
{
    public static void Main()
    {

       Outputclass objOutputclass = new Outputclass(); // this will allocate memory 
 
objOutputclass.Outputclass("this text will not going to print");
    }
}

//then you need to call PrintString() in Outputclass

class Outputclass
    {
        string myString;
 

        public void PrintString()
        {
            Console.WriteLine("Hello!");
        }
 
        public Outputclass(string inputString)
        {
            myString = inputString;
            PrintString();
        }
    }

Posted 15-Nov-15 23:47pm

amit raje

Solution 5

Hi everyone I have tested your solutions,

I understand that I have to call the class.

I using this code below:

C#

using System;
//NAMESPACE
namespace Lesson
{

    class Program
    {
        public static void Main()
        {

            //Alert my Printstring


            Outputclass opc = new Outputclass();
            opc.PrintString();


        }
    }

    class Outputclass
    {
        string myString;


        public void PrintString()
        {
            Console.WriteLine("Hello!");
        }

        public Outputclass(string inputString)
        {
            myString = inputString;
        }
    }
}

but I get following error:

Error 1 'Lesson.Outputclass' does not contain a constructor that takes 0

Could someone help me?

Thank you in advance

Posted 15-Nov-15 23:50pm

Daniel Elmnas

Comments

sanjay243657 16-Nov-15 7:03am

Hi,
You can pass value in Constructor
class Program
{
static void Main(string[] args)
{
Outputclass opc = new Outputclass("Hello !");
opc.PrintString();
Console.ReadLine();
}
}
class Outputclass
{
string myString;

public void PrintString()
{
Console.WriteLine("Hello!");
}

public Outputclass(string inputString)
{
myString = inputString;
Console.WriteLine(myString);
}
}

Solution 7

Thank you very much Bill Woodruff

Posted 16-Nov-15 3:28am

Daniel Elmnas

Comments

CHill60 17-Nov-15 12:53pm

Please stop posting comments as solutions - if you have something to say to a member then use the "Have a Question or Comment?" link next to their post - they will automatically be notified

Solution 8

I got an updated code:

how do I alert the "myCompany AB"

<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Linq;<br />
using System.Text;<br />
<br />
namespace MyProgram<br />
{<br />
    class Program<br />
    {<br />
        static void Main(string[] args)<br />
        {<br />
            CompanyInformation companyInfo = new CompanyInformation();<br />
            Company Compinf = new Company();<br />
            Console.WriteLine(Compinf.ToString());    // Alert goes here<br />
        }<br />
    }<br />
    public class Company<br />
    {<br />
        private string m_name = string.Empty;<br />
        public string GetName()<br />
        {<br />
            return m_name;<br />
        }<br />
        public void SetName(string name)<br />
        {<br />
            m_name = name;<br />
        }<br />
    }<br />
    public class CompanyInformation<br />
    {<br />
        public static void main()<br />
        {<br />
            Company companyInf = new Company();<br />
            companyInf.SetName("MyCompany AB");<br />
            Console.ReadLine();<br />
        }<br />
    }<br />
}<br />
<br />

I dont get the result why?

Thank you in advance.

Posted 16-Nov-15 20:24pm

Daniel Elmnas

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BillWoodruff · Accepted Answer · 2015-11-16T03:10:00

Your code will never compile because 'Outputclass does not contain a constructor that takes zero arguments.

You need to get a good book on .NET and study the basic aspects of using 'Classes. ".NET Zero" by Charles Petzold is free to download: [^].

You can use a working example of a read-eval-print-loop, like the one shown here to study how a Console Application works: set break-points in the code and single-step (F11 in Visual Studio) through the code:

C#

class Program
{
    public static void Main()
    {
        // set a break-point here, then single-step through code
        string inputMessage = "Enter <any characters=""> to continue: Enter <return> to Exit";
        string newEntry = "You entered: ";

        Outputclass o = new Outputclass("get a good .NET book");
        o.PrintString();

        Console.WriteLine(inputMessage);

        string line;

        while ((line = Console.ReadLine()) != string.Empty)
        {
            // set a break-point here
            o.myString = string.Format("{0}{1}", newEntry, line);
            o.PrintString();
            Console.WriteLine(inputMessage);
        }

        Console.WriteLine("exiting Application");
        
        Environment.Exit(0);
    }
}

class Outputclass
{
    public string myString { set; get; }

    public void PrintString()
    {
        Console.WriteLine(myString);
    }

    public Outputclass(string inputString)
    {
        myString = inputString;
    }
}

Newbeginner interact with classes

8 solutions

Solution 1

Solution 2

Solution 3

Solution 4

Solution 5

Solution 6

Solution 7

Solution 8

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