Re: C#.Net application - C# Discussion Boards

Re: Increasing the size of the form

27-May-06 9:48

Have you set the maximum size of the form to 1036, 800? What happens when you maximise the form?

"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
--Charles Babbage (1791-1871)
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stancrm28-May-06 21:17

stancrm

28-May-06 21:17

I think, there is no maximum for the size. I've tried it and it works:

this.Size = new Size(1280, 1024);

C#.Net application

betty_boop27-May-06 9:31

27-May-06 9:31

Hi there, my name is Ami. I am currently a student at DeVry University and am taking my first programming class! I am ready to pull my hair out because I can never get any of my programs right and I really want to understand this stuff. (by the way I'm taking C# programming online)
I have a lab that I need help with....I have to design a solution with a Main() method that holds an integer variable named seconds to which I assign a value, create a method to which you pass the value, the method displays the seconds in minutes and seconds (66 sec. = 1 min and 6 sec.)...I go there from hours and so on, if anyone could give a jump start in the right direction I would appreciate it. Thanks, Ami Rose | [Rose]

Ami

NaNg1524127-May-06 9:34

NaNg15241

27-May-06 9:34

Have you tried DateTime (And it's static members like DateTime.Parse() etc...?)?
turn it to DateTime and it will be easyer then deviding it by 60 and by 24...

Colin Angus Mackay27-May-06 9:41

27-May-06 9:41

NaNg15241 wrote:
Have you tried DateTime (And it's static members like DateTime.Parse() etc...?)?
turn it to DateTime and it will be easyer then deviding it by 60 and by 24...

True, but that is not the point of the exercise. The exercise is trying to teach basic concepts, using examples that everyone will understand, such as how to simple maths in a computer language.

betty_boop27-May-06 9:54

27-May-06 9:54

Basically this is what I have so far...
using System;
struct Time
{
public Time(int hh, int mm)
{
hours = hh;
minutes = mm;
seconds = 0;
}
private int hours, minutes, seconds;
}
Time now = new Time(12, 30);
Console.WriteLine(now.hours);
Console.WriteLine(now.minutes);
Console.WriteLine(Now.Seconds);

Ami

Colin Angus Mackay27-May-06 9:47

27-May-06 9:47

betty_boop wrote:
if anyone could give a jump start in the right direction I would appreciate it

Well... Lets see what you know, then we can concentrate on teaching you the bits you don't know.

1. Do you know how to create a method?

2. Do you know how to call a method?

3. Do you know simple maths (such as 66 divided by 60, and 66 modulus 60)?

4. Do you know how to create a variable? And assign a value to it?

5. Do you know how to write information to the console? (This lab appears to be a console application)

For every "yes", you are part way to the solution. If you answer "yes" to all, then you need to learn how to put it all together in order to get your program working.

So, what are your answers to the above questions?

betty_boop27-May-06 10:04

27-May-06 10:04

I am comfortable saying that I know 3,4,& 5 but a lost on 1 & 2

Ami

Colin Angus Mackay27-May-06 10:24

27-May-06 10:24

Well, looking at your other post, you seem to have a handle on creating structs (which is a little more advanced than I'd expect)

You create a method inside a class or struct. structs are rarely used, but for the most part are very similar to a class. They, structs, are passed "by value" rather than "by reference". Passing by value means that the "value" is copied when it is passed to a method or assigned to a new variable. Passing by reference means that only a reference to the object is passed, not the object itself. This means there is only one copy of the object.

For the rest of this post every time I use class you can also assume it will work with a struct also.

Now, to create a method you need to know some things.

1. What is it going to be called? Typically method names are verbs or verbal phrases. That means they indicate what they are going to do. e.g. CalculateTime

2. What information does the method need to know in order to work? Because a method is part of a class or struct, it will be able to see the information that the class holds. If the class doesn't hold the information that the method needs it will have to be passed in as parameters. So, a method may need parameters.

3. What information is returned? Not all methods return information, sometimes they just modify the class they are part of. But if a method does return some information you need to know what that is. Is it a string? An int? a DateTime?

4. What can see the method? Is is public, private, protected, internal, or internal protected. Don't worry about all these choices at the moment. The two most common are public and private. public means that everything can see the method, private means that only the class (or other instances of the class) can see the method.

So here is an example all put together:

public Time CalculateTime(int seconds)
{
    // Do stuff that calculates the hours, minute and seconds
}

1. It is called CalculateTime
2. It needs to know how many seconds to use is the calculation. And it needs to know that seconds is an int.
3. It returns a Time object (from the struct I saw in your other post)
4. It is public, which means that anything that has an instance of this class can use it.

The next thing you need to know is how to call the method.

As the method returns something you need somewhere to store that (assuming you are interested in the return value - It is perfectly okay to ignore the return value if you want). In this case we need a variable of type Time.

We also need to know what to pass in to the method. In this case we can use a literal value that is hard coded into the application, but you can use a variable of type int (because that is what the method expects) if you want.

Time calculatedTime = CalculateTime(66);

And that is it.

Does this help?

betty_boop27-May-06 10:36

27-May-06 10:36

Yes, that does clear things up a little. The actual "struct" that I was using, I'm not allowed to for this assignment(just asked my professor), so I had to redo it. I did set the method to CalculateTime, let me play with it for a minute and I'll let you know what I come up with...thanks for all your help I truely appreciate it! Smile | :)

Ravi Bhavnani27-May-06 10:42

Ravi Bhavnani

27-May-06 10:42

You're a good bloke, CAM. Cool | :cool:

/ravi

My new year's resolution: 2048 x 1536
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ravib(at)ravib(dot)com

Colin Angus Mackay27-May-06 10:46

27-May-06 10:46

:->

betty_boop27-May-06 11:21

27-May-06 11:21

This is what I have, and I know I am totally off. I thought I would like programming, but I have never been so frustrated in my life!!!!!

using System;
public class CalculateTime
{
public static void Main()
{
int s=0, Totalmin=1, h;
int TotalTime = 1, Total;
}
public static void CalculateTime()
{
while (s >= 0)
//calculate min. to sec.
for (s = 0, s > 60, ++s)

if ((s % 60) !=0)
{
TotalTime = TotalTime + h;
Time++;
h = x + 1;
}
}
Total = Totalmin % s;
Console.WriteLine("The time is: {0}", Time);
}

Ami

Colin Angus Mackay27-May-06 13:41

27-May-06 13:41

betty_boop wrote:
I have never been so frustrated in my life!!!!!

Yeah! But it is such a wonderful feeling when it all works out!

Okay - The code you have probably doesn't even compile. Code can only exist within methods (and Properties - but I'm guessing you haven't got that far yet)

First, you are thinking about the whole thing sequentially (which is common for a beginner). Think about calling method like looking up an entry in the dictionary or an encyclopaedia (The methods themselves are like the entry in the book). You don't read a encyclopaedia from start to finish. You jump in where you need to. You might want to read an article about Edinburgh, and it mentiones a famous ex-resident, Sean Connery, and you want to know more so you skip to that entry, and it mentiones James Bond movies so you jump to that entry. The editor that compiles the encyclopaedia isn't going to know what order you want to read in so cannot compile the book in the order Edinburgh, Sean Connery, James Bond. The only sequential things is the normal reading order of the sentences and paragraphs within an entry. In a program the developer doesn't know what order the methods will be called in (typically - your examples are simple enough that you can tell in advance, but when you get to interactive stuff it all depends on the user making descisions at runtime)

Next thing is that a method knows nothing about anything before it was called unless you tell it (by passing in parameters, or if the information is available by calling other methods, from class fields or properties - don't worry about all that just now, at this stage I think concentration on passing in parameters is what your professor is interested in)

Going back to your original description of the problem:

betty_boop wrote:
I have to design a solution with a Main() method that holds an integer variable named seconds to which I assign a value, create a method to which you pass the value, the method displays the seconds in minutes and seconds (66 sec. = 1 min and 6 sec.)...I go there from hours and so on,

That means the Main method needs very little

// holds an integer variable named seconds to which I assign a value
int seconds = 66;
 
// create a method to which you pass the value
DisplayTime(seconds);

That is all that your Main() method needs.

The more complext thing is creating the DisplayTime() method.
You have a loop which you don't need. Some of the maths may feel a little odd to start with but you'll begin to recognise common patterns soon enough. The trick is to think ahead a little and figure out what you are going to need and see if you can get that a better way - Don't worry, this will start to come naturally once you are practiced more. Which is, of course, the purpose of the exercises you are being set.

There are 3600 seconds in an hour.

hours = seconds / 3600; // Remember this is an integer division so 
                        // everything after the decimal point will be truncated.

There are 60 seconds in a minute, but we also need to discount the hours from the total number of seconds.

remainingSeconds = seconds - (hours * 3600); // Remove the number of whole
                                             // hours to get the remaining seconds

The calculation for the minutes is now similar to the hours, but divide by 60. Then the calcualtion for the remainingSeconds is similar to the one above also, but multiplying your calculated minutes by 60.

So you now have hours, minutes and remainingSeconds which you can output using Console.WriteLine();

So, hopefully I've given you enough that you can re-write your code so that it gets you closer to your goal.

betty_boop28-May-06 9:14