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Hi,
I have little experience writing code, so your help is much needed, and will be really appreciated....please help!!
I need to build a CONSOLE application, written in C#, It should cycle thru the states as shown:
Stop -> Prepare to Go,
Prepare to Go -> Go,
Go -> Prepare to Stop.
Thanks...in advance
__________________________________________
This is what I have come up with till now, but it seems wrong:
using System;
namespace traffic_light
{
///
/// Summary description for Class1.
///
enum State
{
prepare_to_go,
go,
prepare_to_stop,
stop,
}
class Class1
{
private State _state;
public Class1()
{
_state = State.prepare_to_go;
Console.WriteLine ( _state );
_state = State.go;
Console.WriteLine ( _state );
_state = State.prepare_to_stop;
Console.WriteLine ( _state );
_state = State.stop;
Console.WriteLine ( _state );
}
}
}
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You're not too far away. Since you're obviously trying to learn something new, I'll provide leading questions rather than actual answers.
1) How many times is it supposed to cycle through these states?
2) How would you write code to do something that many times?
3) Does the code you have successfully perform one complete state change cycle?
4) (Less important) Would a separate class method (not the constructor) be a better place to do this work?
John
"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.
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Hi,
Thanks for your assistance, John.
It is meant to cycle through these states continuosly...lets say about 5 times. Its meant to pause at each state for a certain amount of time, say about 5 seconds on each state.
Could you give me some pointers in sorting this out.
Also the code posted above does not run, because during compilation I get this error:
"ConsoleApplication1.exe" does not have an entry point defined.
Thanks alot for your help...much appreciated!!
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Here is one simple way to loop 5 times and pause for 5 seconds each time. Hope this gets you going in the right direction.
for(int i = 0; i < 5;i++)
{
System.Thread.Sleep(5000);
}
- Nick Parker
My Blog
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The error I receive when I run the above piece of code is:
'ConsoleApplication1.exe' does not have an entry point defined.
I don't know hopw to rectify the above problem, please help!!
Thanks...
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You must have a Main method in your class:
public static void Main ()
{
// put your code here!
}
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!
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hi, here is everything u need 
i hope it helps u!
<br />
using System;<br />
using System.Threading;
<br />
namespace ConsoleApplication1<br />
{<br />
class Class<br />
{<br />
static void Main()<br />
{<br />
Traffic_light t_l = new Traffic_light();<br />
<br />
for(int i = 0; i < 10; i ++)<br />
{<br />
t_l.ShowState();
Thread.Sleep(5000);
}<br />
Console.WriteLine("press enter to exit");<br />
Console.ReadLine();<br />
}<br />
}<br />
<br />
class Traffic_light<br />
{<br />
private string[] Array;<br />
<br />
private int State;<br />
<br />
public Traffic_light()<br />
{<br />
State = 0;<br />
Array = new string[] { "prepare to go",<br />
"go",<br />
"prepare to stop",<br />
"stop" };<br />
}<br />
<br />
public void ShowState()<br />
{<br />
State %= Array.Length;
Console.WriteLine(Array[State ++]);
}<br />
}<br />
}<br />
<br />
output u see:
====================
prepare to go
go
prepare to stop
stop
prepare to go
go
prepare to stop
stop
prepare to go
go
press enter to exit
====================
best regards !
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Is it possible for a class to call one of its own get/set accessors?
For example:
public class MyClass
{
double m_dbl;
public MyClass(double dbl)
{
m_dbl = dbl;
}
public int DummyProperty
{
get
{
return (int)m_dbl;
}
set
{
m_dbl = (double)value;
}
}
}
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It's the same whether you are outside the class or inside the class.
DummyProperty = yourValue;
John
"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.
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Yes. You could have easily determined this by a test-- calling the accessor from the constructor and checking the result, maybe with a WriteLine statement in the setter. I'm not griping, just trying to save you some trouble for next time!
Your question is a good one; writing your code this way is often a smart thing to do for maintainability-- this way any validation for each property can be located in one place. I believe it could in some cases slightly degrade performance over setting your properties in the constructor, since each property set amounts to a method call, but the .NET compiler should in any even inline those calls unless they're over a certain size limit.
Conceptually speaking, you probably could've guessed the answer without testing if you'd written it this way:
this.DummyProperty = dbl;
As for me, I never use 'this' except for in a few specific situations, like writing a copy method.
Regards,
Jeff Varszegi
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I know you already got your answer: Yes. But, I wanted to expand upon this a little...
I would say that you always want to access your properties through their accessors. Obviously, you can't always do this (i.e. read-only properties); but, it's an ideal that I suggest you try to adhear to. My reasoning behind this is that you might have business logic tied into your accessor methods that should always be used. You've showed this in your example, but let me show you another:
public class User
{
private string m_strName;
private string m_strPassword;
public User(string name, string password)
{
Name = name;
Password = password;
}
public string Password
{
get { return m_strPassword; }
set
{
if ( ValidPassword(value) )
m_strPassword = value;
}
}
...
}With this example, I'd have to do the User.ValidPassword(string) check every time I wanted to set the value. Instead, if I keep this logic in the setter, and just plan to always use that, I don't have to worry about it.
Of course, you won't always have special logic to put into your getters and setters. But, it would be better to be in the habbit of using them, so when you need to do it that way, you're not trying to change your ways.
Michael Flanakin
Web Log
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Hi,
I have a datagrid populated from an XML file.
<pairs>
<pair>
<x>1</x>
<y>1</y>
</pair>
<pair>
<x>2</x>
<y>8</y>
</pair>
...
</pairs>
When I click the headers to sort it, they seem to be sorted as if the values were strings (ie a list of 1 to 10 comes out 1, 10, 2, ...)
How do I persuade them to be treated as numbers (doubles)?
---
J
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You should create Schema for your XML files, you can create a file with .xsd extenstion and you indicate your types in it. For the start point see XML Schema Reference (XSD) topic in MSDN. I think there are some examples in this site too.
Mazy
"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope
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Thanks - I was aware of XSDs, but didn't believe they'd affect datagrid behaviour - I shoud have just tried it shouldn't I?!
---
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jazzle wrote:
but didn't believe they'd affect datagrid behaviour
DataSet.ReadXmlSchema()
Mazy
"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope
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thanks, will make sure it's read.
---
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I created an XSD using the built-in in Vis Studio, edited it to use doubles instead of strings, but it still doesn't correct the problem, and I really can't see why.
any ideas anyone?
---
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You can post a new Message to get more help and be more spcific about how to do it or what is your code.
Mazy
"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope
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will do, thanks
---
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How i can make a Partiture with musical syntax in word 2003 using C#
Andrei
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I take it your talking about writing sheet music in Word 2003?
RageInTheMachine9532
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There are a couple of musical fonts, but you cannot combine the symbols in word 2003, because word won't write multiple symbols across each other on specific positions.
I suppose you use a musical symbols font to write lines, notes etc. on a Bitmap, and don't use word at all.
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Any ideas? I can sort of do it at the moment but they all render themselves on top of each other at (0, 0) instead of their correct locations.
"I think I speak on behalf of everyone here when I say huh?" - Buffy
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I'm trying to figure out the size of base types in bytes so that i can use the FieldOffset attribute properly. However, i'm seeing contradictory information.
If a byte is 8 bits, then a 64 bit integer (ulong) would take up 8 bytes in memory. So, i would assume that:
[FieldOffset(0)]<br />
ulong value1;<br />
[FieldOffset(8)]<br />
ulong value2;
would be the correct way of declaring this, however, in the FieldOffset documentation, they are declared as follows:
[StructLayout(LayoutKind.Explicit)]<br />
public class SYSTEM_INFO<br />
{<br />
[FieldOffset(0)] public ulong OemId;<br />
[FieldOffset(4)] public ulong PageSize;<br />
[FieldOffset(16)] public ulong ActiveProcessorMask;<br />
[FieldOffset(20)] public ulong NumberOfProcessors;<br />
[FieldOffset(24)] public ulong ProcessorType;<br />
}
these long values are using 4 bytes, which is a 32 bit memory block. Won't they over lap and cause the program to overlap, or behave weird?
Cheers
Cata
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ulong / 2 = uint  Hint look at the proper class names
top secret
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