Converting from string to int?

Question

I've just started out with coding and I'm looking at making a simple Higher/Lower game. I have a random start number, and a new number set up when the 'higher' or 'lower' buttons are clicked. What I want to say though is....

If the person clicks the higher button: If NewNumberLbl is greater than round1numberlbl. then do something. Thing is im getting the issue of not being able to say

If {NewNumberLbl.Text > Round1NumberLbl.Text}
{}

because I'm getting the error:

Error 1 Operator '>' cannot be applied to operands of type 'string' and 'string'

so how do I go about fixing this and making it into a type int?

Ps I was trying to create new int's , associate them with the ints within the random number methods and then call them instead?

HELP!

public Round1()
{
    InitializeComponent();
    RandomNumber(0, 12);
    NewNumberLbl.Visible = true;
}

public void RandomNumber(int min, int max)
{
    int num = new Random().Next(min, max);
    Round1NumberLbl.Text = num.ToString();
}

public void RandomNumber2(int min, int max)
{
    int num2 = new Random().Next(min, max);
    NewNumberLbl.Text = num2.ToString();
}

private void Round1HBtn_Click(object sender, EventArgs e)
{
    //RandomNumber2(0, 12);
    //if (newNumber >= originalNumber) 
    //{

    //}
}

Are you seriously telling me you couldn't look this up on Google (or on StackOverflow)? — Ant P, Jan 23 '14 at 12:35
Few hints: use numeric data type such as int to compare the values using operators such as < and >. Also, let your methods return an int instead of void and use that result. Also, your 2 methods are almost identical. Try to use only one. — NoChance, Jan 23 '14 at 12:41

score 3 · Answer 1 · answered Jan 23 '14 at 12:36

3

Converting a string to a int:

int i;
if (int.TryParse("1234", out i){
    //ok
}

answered Jan 23 '14 at 12:36

Peter

27,590
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1

I like using the TryParse as it adds some defense in case the string is contains characters other than a number. I posted a good MSDN reference in my answer the OP should read and digest. +1 for first answer peer. – websch01ar Jan 23 '14 at 12:40

score 2 · Answer 2 · answered Jan 23 '14 at 12:37

You can use:

Convert.ToInt32(myString);

or:

int myOut;
int.TryParse(myString, out myOut);

The first one will throw an exception if you try to convert something thats not parseable in an int.

The second one will result in 0 if the conversion is not successful

score 1 · Answer 3 · edited Jan 23 '14 at 12:58

1

http://msdn.microsoft.com/en-us/library/bb397679.aspx Try this:- Convert.ToInt32(input);

Example:

if (Convert.ToInt32(LblnewNumber.Text) >= Convert.ToInt32(LbloriginalNumber.Text)) 
        {

        }

edited Jan 23 '14 at 12:58

wruckie

1,717
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answered Jan 23 '14 at 12:36

variable

8,262
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score 0 · Answer 4 · answered Jan 23 '14 at 12:37

0

int.Parse(NewNumberLbl.Text);

You should however make sure the label has a number and not some other character.

answered Jan 23 '14 at 12:37

Ricardo Appleton

679
10
22

score 0 · Answer 5 · answered Jan 23 '14 at 12:38

0

string text = "500";
int num = int.Parse(text);

This should work. And you can use TryParse to check "text" is valid

answered Jan 23 '14 at 12:38

Erkan Akın

106
5

Converting from string to int?

5 Answers5