HaloMods "Classic" Read-only Archive

Posted: **Fri Jul 13, 2007 12:39 pm**

I have some more questions.
Is there a way to have c# to check if a variable is a perfect square?

Also, is there a way to add a new form to my project which will be an MDIContainer for the original and any new forms I may add?

Also, this has been edited so some responses don't flow with these questions.

Thanks for any help.

Posted: **Fri Jul 13, 2007 2:18 pm**

i've never seen a lick of C# code in my life, but in C++ it would look something like this:

Code: Select all

#include <iostream> /*for input/output stream support. we need this to use cin for the input.*/

int main()
{
    int input; //the int variable the user's input will be stored in.
    std::cout << "\nenter the numbers: "; //the output to tell the user what to do
    std::cin >> input; //cin takes what they type in and stores it in input

    /*note: when cin encounters a space, it stops reading from the stream. for a single number, that shouldn't be a problem, but it causes issues when you get into strings...*/

    return(0); //end the program, and return 0 (everything's fine)
}

Posted: **Fri Jul 13, 2007 2:27 pm**

Code: Select all

int variable = 0; // initialize your variable
Convert.ToInt32(TextBox1.Text); // textbox.text returns a string, so convert it to an int

Posted: **Fri Jul 13, 2007 2:30 pm**

Code: Select all

int num1; // For storing the integer (whole number)

if (int.TryParse(textBox1.Text, out num1))
{

// If we're here that means the text could be converted to an integer, and so num1 will now be that variable integer

}
else
{

// Couldn't convert

}

I can't think of anything better than that for doing what you want.

Posted: **Fri Jul 13, 2007 3:41 pm**

I tried your's prey, but I get an error saying int doesn't contain a deffinition for TryParse.

I also tried OwnZ joO's but I don't really understand it.

Remeber that I am very new to this so explanation in great detail will help.

Edit: After searching google for a while, I found a solution that works for me.

Now I have a new question. Is it possible to make the datatype of a variable that is a square root not a double?

Basicly, can I get somthing like this

Code: Select all

int variable = (Math.Sqrt(otherVariable));

Posted: **Fri Jul 13, 2007 6:07 pm**

Code: Select all

int variable = (Math.Sqrt(otherVariable));

To:

Code: Select all

int variable = (int)Math.Sqrt(yourDouble);

There is also the "Convert.To...()" function which is useful for many different conversions.

Posted: **Fri Jul 13, 2007 6:50 pm**

Thank you so much.

I haven't seen you around here in a while dos. Doom told me you died.

Posted: **Sat Jul 14, 2007 2:52 am**

Me wonders what C# you are using :/

Posted: **Sat Jul 14, 2007 4:08 pm**

If you can't get TryParse to work do this:

Code: Select all

int num = 0;
try
{
    // parse the int
    num = int.Parse(textBox1.Text);
}
catch
{
    // if it reaches here the text cant be parsed to an int
}

Posted: **Mon Jul 16, 2007 10:18 am**

I updated my first post with more questions. Please help.

Posted: **Mon Jul 16, 2007 10:27 am**

WaywornMmmmm wrote:Is there a way to have c# to check if a variable is a perfect square?

Not sure what your asking here, but the 'Math.' does have quite a few useful functions which may be what your looking for.

WaywornMmmmm wrote:Also, is there a way to add a new form to my project which will be an MDIContainer for the original and any new forms I may add?

You can make a form a MDIContainer by enabing the 'IsMdiContainer' in the forms properties, then to add a form to the container:

Code: Select all

        private void Form1_Load(object sender, EventArgs e)
        {
            Form2 form2 = new Form2();
            form2.MdiParent = this;
            form2.Show();
        }

Posted: **Mon Jul 16, 2007 11:18 am**

Prey wrote:
WaywornMmmmm wrote:Is there a way to have c# to check if a variable is a perfect square?
Not sure what your asking here, but the 'Math.' does have quite a few useful functions which may be what your looking for.

What I am trying to do is have C# check to see if my variable is a perfect square (4,9,16,25,36, etc.) and if not display a message box with that number. I know how to do the latter, but I am not sure how to do the first part.

Also, when I try to make the form I added to my project an MDIContainer with your code, I get an error saying that my form can't be both and MDIParent and an MDIContainer

What I did was add my form, set its Is MdiContainer property to true, then went the the load event of my original form and entered in the code you gave me.

Posted: **Mon Jul 16, 2007 12:41 pm**

For your square root problem here's a possible solution.(note: its sloppy and there's probably better ways to do this but it works...)

Code: Select all

double d = # you want to check;
long i = (long)Math.Sqrt(d); // you want to convert the sqrt to a value that does not hold decimals. ie: integers, longs, etc...
if ((i * i) == d)
{
    // it's a square #
}
else
{
    // it's not a square #
}

Posted: **Mon Jul 16, 2007 1:46 pm**

For a MdiContainer
1) Go to the properties of the form you wish to be a container.
2) Enable 'IsMdiContainer'.
3) Now go into the containers load event. Assuming the container form is 'Form1' and the form you want to add is 'Form2'; the code i posted above will work just fine.

As for finding out if the number is a perfect square, dos mes' way would work, but here is a faster alternative:

Code: Select all

double d = 13; // The squared num
double sqrt = Math.Sqrt(d); // The square root of the num

if (sqrt == Math.Round(sqrt))
{
   // No rounding was done, thus the number is a whole
}
else
{
   // Rounding was done, thus the number wasn't a whole
}

Posted: **Mon Jul 16, 2007 2:18 pm**

When I input your code into the load event for the MdiContainer, with the form names and coding exactly the same:

Code: Select all

Form2 form2 = new Form2(); 
            form2.MdiParent = this; 
            form2.Show();

Form2 loads when I test it, but Form1 doesn't. I've used this code once before when the MdiContainer was the first form in my app, and it worked. I don't think this code works when the MdiContainer is added to the app.

Posted: **Mon Jul 16, 2007 2:29 pm**

So what are you trying to say? You trying to add Form1 to the MdiContainer too?

Code: Select all

            Form1 form1 = new Form1(); 
            form1.MdiParent = this; 
            form1.Show();

Remember that the 'this' is the current form, and so the current form must be the MdiContainer

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