[skyline2162]

This is my first question that i've posted so i don't know if im doing it right, sorry if not. And i don't know how to put it in the format that you guys want. Sorry.

Homework instructions said:

Write A Rainfall class that stores the total rainfall for each of 12 months into an array of doubles. The program should have methods that return the following:
the total rainfall for the year
the average monthly rainfall
the month with most rain
the month with least rain
Demonstrate the class in a complete program. (Do not accept negative numbers for monthly rainfall figures)

Read more: Write A Rainfall class that stores the total rainfall for each - JustAnswer http://www.justanswe...l#ixzz1iEmCnbcu

using System;

class RainFall
{
	public static void Main()
	{
		double totalRainFall;
		double averageRainFall;
		double mostRain;
		double leastRain;
		
		totalRainFall();
		averageRainFall();
		mostRain();
		leastRain();
	}
	
	public static double TotalRainFall()
	{
		double[] rainfall = new double [12];

I am stuck from here, i don't know like how am i going to put an array with this, i am so confused on how to approach this. Thank you for any one that helps.

its in c# please, i tried finding it online but its in java and im even more confused

This post has been edited by tlhIn`toq: 01 January 2012 - 12:50 PM
Reason for edit:: code tags

[tlhIn`toq]

Other than "I'm confused"... What exactly is your question?

Since the instructions read like homework we can't give you code, but can guide you to some better understanding. But with the post being so vague I'm not sure where to start.

You have already created an array, so that doesn't seem to be a problem. From here you just need to keep coding. Make a method for each of the assignment requirements.


Reminder to new folks: This is homework and we don't provide completed code for homework. Rather we try to help the student comprehend the concept they are struggling with so they can write their own code. They are being graded on their skill not ours.

Stages of asking for homework help on a forum.
I don't want you to write my code, just give me ideas on how to solve my problem.

What have to you tried to code so far?
What part of what you have tried isn't working?
Are you getting error messages, or is it just not giving you the results you wanted?

(In other words, you at least have to make and show us your good faith effort to do your own coding. We are here to help you, not do it for you.)
What does this error mean?

Suggestion:
Don't replace lines of code that don't work. Instead comment them out and put your new attemps below that. This will keep you from re-trying the same ideas over and over. Also, when you come back to us saying "I've tried this 100 different ways and still can't get it", we can actually see what you tried. So often a failed attempt is very very close and just needs a little nudge in the right direction. So if we can say "See what you did in attempt 3... blah blah" it helps a lot

// Try #1 - May 1, 0900hrs
//    code
//    code  
//    code
// Try #2 - May 2, 1700hrs   Okay, plan B.  What if I do it *this* way
//    code
//    code  
//    code
// Try #14 - May 3, 0500hrs after 5 cans of RedBull.  Maybe I should get some sleep. I can't think of anything else but this last idea
    code
    code  
    code

If you are using Visual Studio you can select a block of lines and hit control+k control+c (Kode Comment) to comment it out. control+k control+u (Kode Uncomment) to uncomment a selected block.

[skyline2162]

i don't get where to start like, where do i put in the arrays do i put it in the the methods or how would i format the arrays, this is not homework, i failed programming this year in university and i am trying to learn it on my own now through the textbook questions. Okay how would i start like can someone just tell me what to write in the methods or something? or what do i put in the private sections?

[tlhIn`toq]

"the private sections"... Uh... Those are the methods (also known as functions).

No offense, but I don't think anyone here is going to be your free private tutor to learn C# from the ground up. I certainly have no desire to sit here and write all of your methods for you. That is what the assignment wants you to do. If you are not ready for that assignment then back up one or two or five chapters and re-read and re-work the lessons. There is no point you being given the code for this if you don't understand what you're doing; that won't actually help you in the long term.

We have several tutorials in the C# section. And there are MANY good self-teaching books on the subject.

Don't try to create a useful working program to fit a need of yours (or a for-pay contract) as your introduction to coding project. When you are learning to code you don't know enough to code a program, let alone know how to engineer the architecture of a program. It would be like saying "I don't know how to read sheet music, or play an instrument. I think I'll write a 3 act opera as my first learning experience."

I don't say this to be mean. We've seen lots of new coders take this approach and we know it doesn't work. Trying to design your own programs before you understand the basics of the code language you've chosen just leads to problems, frustrations, and 'swiss-cheese' education (lots of holes).

---

Resources, references and suggestions for new programmers. - Updated Dec 2011

---

Spoiler

Quote

I already have a background in programming from this other software/technology/lanugage so I don't think I need to do tutorials

Here's how I look at doing tutorials even if one has a coding background that makes one think they don't need to do tutorials:

• If one's background really is enough to not need the tutorials, then they won't take long - So what's the harm?
  
• If the tutorials do take a while, then it might be time to re-think how much of one's old experience really applies to the new technology.
  
• There's no down-side. Every tutorial/series teaches something in a new way. Maybe you pick up a neat trick or a different approach to something that you already knew.

The stages of asking for homework help on a forum

Finding answers to specific problems:
Sometimes just knowing where to look can make all the difference. Google is your friend.
Search with either "C#" or "MSDN" as the first word: "MSDN Picturebox", "C# Custom Events", "MSDN timer" etc.
How to do a good search that will get you targeted answers.

Once you have that MSDN page that describes the function, you may not be familiar with out to actually get useful information from that page. There is a LOT of data there. So what is the important parts? Read this guide to reading the MSDN.

Don't think you are the first person to ask a question. Try a search on this site to see if someone has already brought up this problem. Also, as soon as you post your question go to the bottom of the updated page: You will see where the system has already analyzed your question and tried to find similar threads for the same question, so check those links out.

But honestly, just typing away and seeing what pops up in Intellisense is going to make your self-education take 20 years. You can learn by trying to reverse engineer the language through banging on the keyboard experimentation - or you can learn by doing the tutorials and following a good "How to learn C#" book. There are so many great "How do I build my first application" tutorials on the web... There are dozens of "Learn C# in 21 days", "My first C# program" type books at your local book seller or even public library.

Beginner:
C# Fundamentals: Development for absolute beginners
Build a Program Now! in Visual C# by Microsoft Press, ISBN 0-7356-2542-5 is a terrific book that has you build a Windows Forms application, a WPF app, a database application, your own web browser.

Martyr2's mega project ideas list is a great place to start on developmental projectst that you can learn from; rather than trying to make something complex like a game as a self-teaching tool {that never works for anyone}

Visual Studio Keyboard Shortcuts

D.I.C. C# Resource page Start here
Intro to C# online tutorial then here...
C# control structures then here.
MSDN Beginner Developer video series
MSDN video on OOP principals, making classes, constructors, accessors and method overloading
MSDN Top guideline violations, know what to avoid before you do it.
Design patterns as diagrams

I hate sending people to another site when we have such good tutorials here, but this series shouldn't be overlooked.
Programming OOP in C# - Part 1
Programming OOP in C# - Part 2
Programming OOP in C# - Part 3
Programming OOP in C# - Part 4
Programming OOP in C# - Part 5

Writing a text file is always one of the first things people want to do, in order to store data like high-scores, preferences and so on.
Writing a text file tutorial.
Reading a text file tutorial.

Have you seen the 500+ MSDN Code Samples? They spent a lot of time creating samples and demos. It seems a shame to not use them.

Intermediate:
The tutorials below walk through making an application including inheritance, custom events and custom controls, object serialization and more.
Bulding an application - Part 1
Building an application - Part 2
Quick and easy custom events
Separating data from GUI - PLUS - serializing the data to XML
WPF version (WPF-MVVM data binding)
Passing values between forms/classes
Decouple your multi-threaded work from the GUI so forms don't hang

Working with environmental variables
'Why do we use delegates?' thread
And everyone always wants to connect to a database, right out of the gate so Database tutorials right here on DIC

C# Cookbooks
Are a great place to get good code, broken down by need, written by coding professionals. You can use the code as-is, but take the time to actually study it. These professionals write in a certain style for a reason developed by years of experience and heartache.

Everyone:
Debugging tutorial
Debugging tips
Debugging in detail
Great debugging tips
It still doesn't work, article

I urge you to work through the C# learning series here on DIC, and to work a self-teaching book from cover to cover before you even think about designing your own applications.
Microsoft Visual Studio Tips, 251 ways to improve your productivity, Microsoft press, ISBN 0-7356-2640-5 Has many, many great, real-world tips that I use all the time.

These are just good every-day references to put in your bookmarks.
MSDN C# Developers Center with tutorials
Welcome to Visual Studio
Free editions of Visual Studio 2010

Windows Presentation Foundation:
Create Animations Programmatically

Let me also throw in a couple tips:

• You have to program as if everything breaks, nothing works, the cyberworld is not perfect, the attached hardware is flakey, the network is slow and unreliable, the harddrive is about to fail, every method will return an error and every user will do their best to break your software. Confirm everything. Range check every value. Make no assumptions or presumptions.
  
  
• Take the extra 3 seconds to rename your controls each time you drag them onto a form. The default names of button1, button2... button54 aren't very helpful. If you rename them right away to something like btnOk, btnCancel, btnSend etc. it helps tremendously when you make the methods for them because they are named after the button by the designer.btnSend_Click(object sender, eventargs e) is a lot easier to maintain than button1_click(object sender, eventargs e)
  
  
• You aren't paying for variable names by the byte. So instead of variables names of a, b, c go ahead and use meaningful names like Index, TimeOut, Row, Column and so on. You should avoid 'T' for the timer. Amongst other things 'T' is commonly used throughout C# for Type and this will lead to problems. There are naming guidelines you should follow so your code confirms to industry standards. It makes life much easier on everyone around you, including those of us here to help. If you start using the standards from the beginning you don't have to retrain yourself later.
  
  
• Try to avoid having work actually take place in GUI control event handlers. It is usually better to have the GUI handler call other methods so those methods can be reused and make the code more readible.
  
  Spoiler

  
  

  btnSave(object sender, eventargs e)
  {
      SavePreferences();
  }
  
  SaveMenuItem(object sender, eventargs e)
  {
      SavePreferences();
  }
  
  SaveContextMenu(object sender, eventargs e)
  {
      SavePreferences();
  }
  
  FormMain_Closing(object sender, eventargs e)
  {
      if (IsDirty) SavePreferences();
  }
  

  
  
  
• I strongly suggest installing VMware or some other virtualization technology on your development PC so you can create a couple virtual computers for testing. This would allow you to debug and test inside: WinXP32, XP64, Vista, Win7x32, Win7x64... etc. without having to actually have 5 physical PC's. Visual Studio will let you send the debug directly into one of these virtual machines so you can watch it operate, check its variables, see the crashes and so on just as if it were debugging on your real machine.
  
  
• This can't be stressed enough in today's world of cell phone messaging:
  Don't use txt/sms/leet/T9 speak like: u no, u r, dnt, wut i m do-n, coz, al gud, b4, ny1, and so on like this guy:
  
  dis not b d'hood dawg... You are sitting at a real keyboard with a real monitor, not a cell phone. You are not here texting your high school posse to come to your kegger after their shift at Taco Bell. You are here asking for help from senior coding professionals who graciously donate their valuable time to helping the next generation of coders with their chosen craft. Please try to show them, yourself and the industry some respect by writing at least at an eighth grade level. (IE: English not ebonics or SMS, real words, punctuation and so on). If you can't take your own problem/question seriously enough to write like an adult, then why would you expect anyone else to take it seriously?
  
  When you write a post you are presenting yourself. Your writing style is all you have to show others who you are and what you stand for. When I see posts filled with lack of capitalization, SMS text like 'Urself', lack of punctuation and so on; what I see is someone who just doesn't care to make even an eighth grade presentation of themselves. I also see that you feel we are not worth the effort. Posts that look like this show that you don't feel the person you are talking to is worth speaking to as an adult. If you show this level of contempt or apathy towards someone you are asking for help how can you expect to be taken seriously or expect to receive that expert's fullest attention and time to help you?

==========================

Quote

i am trying to learn it on my own now through the textbook questions.

So you are re-using the same textbook from class? Don't do that. Go pick up "Head First C#" or "Learn C# in 24 hours" and work those books from cover to cover.

Those books are designed for the self-teaching student. Where you class textbook is just one part of the curriculum and is expected to be augmenting the live lecture from the teacher.

[skyline2162]

thank you for your help

[skyline2162]

Write A Rainfall class that stores the total rainfall for each of 12 months into an array of doubles. The program should have methods that return the following:
the total rainfall for the year
the average monthly rainfall
the month with most rain
the month with least rain
Demonstrate the class in a complete program. (Do not accept negative numbers for monthly rainfall figures)

using System;

class RainFall
{
	private double total = 0;
	private double average;
	private double most;
	private double least;
	private double[] month = new double[11]; 
	private double amount;

	public RainFall(double t, double a, double m, double l, double w)
	{
		total = t;
		average = a;
		most = m;
		least = l;
		amount = w;
	}
	
	public double Amount()
	{		
		for (int i = 0; i < month.Length; i++)
		{
			Console.WriteLine("Enter the rainfall (in inches) for month {0}", (i+1));
			month[i] = Convert.ToDouble(Console.ReadLine());
			while (month[i] <= 0)
			{
				Console.WriteLine("Enter the rainfall (in inches) for month {0}", (i+1));
				month[i] = Convert.ToDouble(Console.ReadLine());
			}
			
			return month;
		}
	}
	
	public double Total()
	{
		for (int i = 0; i < month.Length; i++)
		{
			total += month[i];
			return total;
		}
	}
	
	public double Average()
	{
		for (int i = 0; i < month.Length; i++)
		{
			average = total / 12;
		}
	}
	
	public double Most()
  	{
        double most = 0;
		
        for ( int i = 0; i < month.Length; i++)
        {
        	if (month[i] > most)
        	{
        		most = month[i] ;
        	}
        }
        return most;
  	}

	public double Least()
	{
		double least = 0;
		
		for ( int i = 0; i < month.Length; i++)
		{
			if (month[i] < least)
			{
				least = month[i];
			}
		}
		return least;
	}
	
	public static void Main()
	{
		Console.WriteLine("The total rainfall was {0}.", total);
		Console.WriteLine("The average rainfall was {0}.", average);
		Console.WriteLine("The most rainfall was {0}.", most);
		Console.WriteLine("The least rainfall was {0}.", least);
	}	
}		

My errors are
<33,16> cannot implicitly convert type 'double[]" to 'double'
<39, 37> warning CS0162: unreachable code detected
<37, 16> error CS0161: 'RainFall.Average<>': not all code paths return a value
<46,16> error CD0161: "RainFall.Average<>": not all code paths return a value.
<84, 52> error Cd0120: an object reference is required for the non-static field method, or property 'RainFall.total'
<5, 17> <Location of symbol related to previous error>
<85, 54> error CD0120: An object reference is required for the non - static field, method, or property 'RainFall.average'
,6, 17.: <Location of symbol related to previous error>
<86, 51> error CD0120: An object reference is required for the non- static field, method, or property 'RainFall.most'
<7, 17> <Location of symbol related to previous error>
<87, 52>: error CD0120: An object reference is required for the non- static field, method, or property 'RainFall.least'
<8, 17> <Location of symbol related to previous error>

I have no clue how to fix these it took me around 6 hours to write this code and I tried reading in the textbook and I am now stuck here. Please help me. Thank You.

[RexGrammer]

You really need to try harder for yourself, since the errors here are obvious...

Here are the solutions to your mentioned errors (yes there are more, as you will see for yourself later... )
Let's go in order:

1.

Quote

cannot implicitly convert type 'double[]" to 'double'

You need to specify that you will return a double array, buy you're just saying you will return a double:
So change this:
public double Amount(){/*...*/
Into this:
public double[] Amount(){/*...*/}

Why is this happening? Well when you return a array of doubles (hint: return month (and 'month' is an array of doubles), you need to specify that you will be returning it in the method signature.

2.

Quote

<37, 16> error CS0161: 'RainFall.Average<>': not all code paths return a value
<46,16> error CD0161: "RainFall.Average<>": not all code paths return a value.

You need to return your value after the for loop:

So change this:

public double Average()
	    {
	        for (int i = 0; i < month.Length; i++)
	        {
	            average = total / 12;
	        }
	    }

Into this:

public double Average()
            {
                for (int i = 0; i < month.Length; i++)
                {
                    average = total / 12;
                }
                return average;
            }

Why is this happening? Well if you say you will return a double, then you have to return a double. In your code you didn't return anything.

NOTE: You have more errors, as you will probably discover for yourself...
NOTE2: Some of your logic isn't good, I won't tell you what part, you will figure that part out for yourself
NOTE3: Maybe look toward improving your code style...
Question: What IDE are you using? You're not using any version of VS from what I see. A GREAT and FREE IDE is the
Visual C# 2010 Express from Microsoft. So yeah, this is a suggestion to change your IDE.

FINAL AND MOST IMPORTANT NOTE: Since you're pretty new to all this programming 'stuff' (at least from what I see), take a look at these two GREAT tutorials to get you started:
Building an application - POS/Cash Register - Part one Custom keyboard and inheritence
Building An Application - POS/Cash Register - Part Two The Display

OR Grab a book and read it from COVER TO COVER. My suggestion and personal favorite is: Microsoft Visual C# 2010 Step by Step, or if you don't like that one chose one from out: Recommended C# Books

DON'T POST DUPLICATE QUESTIONS!
I have no clue how to start this code can any one point out what to do
You should've just continued to post your questions in that thread. Since it is the same project AND probably the same problem.
Resolved with the merge of the thread.

This post has been edited by RexGrammer: 01 January 2012 - 06:43 PM

[tlhIn`toq]

In the future please don't start multiple threads for the same topic.
I've merged the two threads for this one issue.

I'm going to repeat my earlier suggestion:
Work on tutorials where they walk you through exercises to help you learn. Stop trying to create something from scratch - You're not ready to do that.

[skyline2162]

I've tried going through those, the only way im learning is through struggling to write code from scratch, the thought process i guess is helping me, i've tried reading sooo much and watching videos but honestly im not learning until i actaully type it.

how come in this code, i did not put least and greatest in my private fields?

using System;

public class RainfallArray
{
	private int month = 12;
	private double total = 0;
	private double average;
	private double[] months = new double[12];
	
	public void setMonths()
	{
         for(int i = 0; i  < month; i++ )
         {
			 Console.WriteLine("Enter the rainfall (in inches) for month #{0}: ", (i+1));
			 months[i] = Convert.ToDouble(Console.ReadLine());
			 
			//Input Validation - Cannot accept a negative number
			while (months[i] < 0)
			{
				Console.WriteLine("Oops! Rainfall must be at least 0. Please enter a new value.");
				Console.WriteLine("Enter the rainfall (in inches) for month #{0}: ", (i+1));
				months[i] = Convert.ToInt32(Console.ReadLine());
			}
         }
	}

	public double Total()
	{
		total = 0;
		
		for(int i = 0; i < 12; i++)
		{
			total = total + months[i];
		}
		return total;
  	}
  
	public double Average()
	{
		average = total / 12;
		return average;
	}

	public double Largest()
	{
		double largest = months[0];//first element of the array
		 
		for (int i = 0; i < months.Length; i++)
		{
			if (months[i] > largest)//checks if next number is greater the preceding                     
								 //one
			{
				largest = months[i];
			}
		}
		return largest;
	}

	public double Least()
	{
    double least = months[0];//first element of the array
	
    for (int i = 0; i < months.Length; i++)
    {
        if (months[i] < least)//checks if next number is lesser the preceding                     
                             //one
        {
            least = months[i];
        }
    }
    return least;
	}

	public static void Main()
	{
		RainfallArray r =new RainfallArray();
		r.setMonths();
		Console.WriteLine("The total amount of rainfall was: {0}. ", r.Total());
		Console.WriteLine("The smallest amount of rainfall was: {0}. ", r.Least());
		Console.WriteLine("The largest amount of rainfall was: {0}. ", r.Largest());
		Console.WriteLine("The average amount of rainfall was: {0}. ", r.Average());
	}

}

[RexGrammer]

You have declared local variables in your methods. You're using them instead of global variables (the ones you say are 'missing' )

Example:

public double Largest()
{
     double largest = months[0];//Here is the variable you're using for the comparison
     //...
}

This post has been edited by RexGrammer: 02 January 2012 - 12:28 PM

[skyline2162]

does that mean i can take out the private average and private total?

[RexGrammer]

Of course, it would be good idea to do that...

But you have to move their declaration to the method what isn't hard:

public double Total()
	    {
	        double total = 0;
	         
	        for(int i = 0; i < 12; i++)
	        {
	            total = total + months[i];
	        }
	        return total;
	    }

public double Average()
	    {
	        double average = total / 12;
	        return average;
	    }

That way you can delete the declarations of the global variables called total and average.

This post has been edited by RexGrammer: 02 January 2012 - 12:44 PM

[skyline2162]

but if i do that then i get an error saying that total doesn't exist in current context.

using System;

public class RainfallArray
{
	private int month = 12;
	private double[] months = new double[12];
	
	public void setMonths()
	{
         for(int i = 0; i  < month; i++ )
         {
			 Console.WriteLine("Enter the rainfall (in inches) for month #{0}: ", (i+1));
			 months[i] = Convert.ToDouble(Console.ReadLine());
			 
			//Input Validation - Cannot accept a negative number
			while (months[i] < 0)
			{
				Console.WriteLine("Oops! Rainfall must be at least 0. Please enter a new value.");
				Console.WriteLine("Enter the rainfall (in inches) for month #{0}: ", (i+1));
				months[i] = Convert.ToInt32(Console.ReadLine());
			}
         }
	}

	public double Total()
	{
		double total = 0;
		
		for(int i = 0; i < 12; i++)
		{
			total = total + months[i];
		}
		return total;
  	}
  
	public double Average()
	{
		double average = total / 12;
		return average;
	}

	public double Largest()
	{
		double largest = months[0];//first element of the array
		 
		for (int i = 0; i < months.Length; i++)
		{
			if (months[i] > largest)//checks if next number is greater the preceding                     
								 //one
			{
				largest = months[i];
			}
		}
		return largest;
	}

	public double Least()
	{
    double least = months[0];//first element of the array
	
    for (int i = 0; i < months.Length; i++)
    {
        if (months[i] < least)//checks if next number is lesser the preceding                     
                             //one
        {
            least = months[i];
        }
    }
    return least;
	}

	public static void Main()
	{
		RainfallArray r =new RainfallArray();
		r.setMonths();
		Console.WriteLine("The total amount of rainfall was: {0}. ", r.Total());
		Console.WriteLine("The smallest amount of rainfall was: {0}. ", r.Least());
		Console.WriteLine("The largest amount of rainfall was: {0}. ", r.Largest());
		Console.WriteLine("The average amount of rainfall was: {0}. ", r.Average());
	}

}

[RexGrammer]

Two things to fix/modify:

1. You should call the method total when you're determining the average.
2. Also you can use the additive assignment operator (+=) when counting the total.

NOTE:
This is:
total = total + months[i];

Is equal to:
total += months[i];

CODE:
Here's the modified code:

            public double Total()
	    {
	        double total = 0;
	         
	        for(int i = 0; i < 12; i++)
	        {
	            total += months[i];
	        }
	        return total;
	    }
	   
	    public double Average()
	    {
	        double average = this.Total() / 12;
	        return average;
	    }

This post has been edited by RexGrammer: 02 January 2012 - 12:58 PM

[skyline2162]

public double Average()
37
    {
38
        double average = total / 12;
39
        return average;
40
    }

that total