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Re: C#

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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 12:55 PM
Hello I'm currently learning C#. I created this random application that generates a random number when you click button1 if you click button1 ten times then it shows a message box that shows "Limit reached!:", but it seems that my code is not working, and I do not get an output.

int num1 = 1;
int num2 = 2;
int clicks = 0;
Random random = new Random();
int randomNumber = random.Next(100,10000);
label1.Text = ("Random: "+randomNumber);
clicks = clicks + 1;
if (clicks == 10) {
button1.Enabled = false;
MessageBox.Show("Limit reached!","Notice!");
}
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 12:57 PM
If you declare "int clicks = 0;" inside the body of the function, then it isn't carried over to the next time you click it. Also, what are the num1 and num2 variables for?
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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 12:58 PM
Oh those are just random integers i created ignore them.
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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 01:01 PM
So, where do I place the integer?
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 01:03 PM
Outside the function body.
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AndroidKitKat is not online. AndroidKitKat
Joined: 21 Sep 2013
Total Posts: 1525
31 Oct 2013 01:03 PM
^ xD
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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 01:04 PM
I'm sorry I'm just new to this .-.
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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 01:09 PM
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
//int clicks = 0; here?
{
Random random = new Random();
int randomNumber = random.Next(100,10000);
clicks = clicks + 1;
label1.Text = ("Random: "+randomNumber+" Clicks: "+clicks.ToString());
if (clicks >= 10) {
button1.Enabled = false;
MessageBox.Show("Limit reached!","Notice!");
}
else if(clicks != 10){
MessageBox.Show("Continue!", "Notice!");
}
}

private void textBox1_TextChanged(object sender, EventArgs e)
{

}

private void label1_Click(object sender, EventArgs e)
{

}
}
}
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 01:10 PM
No, before the function header (the private void button1_Click line)
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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 01:11 PM
Yes thank you :D
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AndroidKitKat is not online. AndroidKitKat
Joined: 21 Sep 2013
Total Posts: 1525
31 Oct 2013 01:13 PM
Dr01d, I still haven't seen sharp, so I have a question, is his code logically invalid because the value keeps resetting or because it makes a new variable(or both?)?
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 01:15 PM
@Bruce: It worked then? :D

@Android: Variable scope. Because clicks was declared inside the function, as soon the function stops the value is lost, and so next time it's clicked, a new variable called clicks is created again with the value of 0.
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AndroidKitKat is not online. AndroidKitKat
Joined: 21 Sep 2013
Total Posts: 1525
31 Oct 2013 01:17 PM
So, it's both? Does this also happen in C?
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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 01:18 PM
Oh I get it.
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 01:18 PM
@Android: Yes variable scope is important in C, and C++, and Java, and Lua, and a lot of languages.
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AndroidKitKat is not online. AndroidKitKat
Joined: 21 Sep 2013
Total Posts: 1525
31 Oct 2013 01:20 PM
Really? I didn't see this happen in Lua. :/
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
31 Oct 2013 01:22 PM
do
local var = 1
end
print(var)

>nil

Or am I missing something?
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 01:22 PM
Run this:

local function clicked()
local clicks = 0;
print("Clicked");
clicks = clicks + 1;
if (clicks == 10) then
print("10 clicks!");
end
end

for i = 1, 10 do
clicked();
end
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 01:23 PM
@Not: Remove the "local" before var and it would print 1 because then var would be declared in the global scope, rather than the local scope of that do block.
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
31 Oct 2013 01:29 PM
@dr01d: But he said 'I didn't see this happen in Lua', and I am not sure if I am missing some large part of this conversation. All my brain is thinking right now about knives, and how they are sharp.
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 01:29 PM
O.o right then...
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AndroidKitKat is not online. AndroidKitKat
Joined: 21 Sep 2013
Total Posts: 1525
31 Oct 2013 01:31 PM
Without the "local" I mean.
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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 02:16 PM
int clicks = 0;
int limit = 100;
int warn = limit-1;

Why doesn't this work?
Output:
Error 1 A field initializer cannot reference the non-static field, method, or property
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Dr01d3k4 is not online. Dr01d3k4
Joined: 11 Oct 2007
Total Posts: 17916
31 Oct 2013 02:19 PM
Make limit and warn static:

private int clicks = 0;
private readonly static int limit = 100;
private readonly static int warn = limit - 1;
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BruceAB12 is not online. BruceAB12
Joined: 19 Jan 2012
Total Posts: 3238
31 Oct 2013 02:23 PM
It works thanks but, I would like to know what exactly does static do?
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