Here is the beginning of my code:
public partial class Form1 : Form
{
static Random random = new Random();
int prevnum;
int currentnum;
public int GenerateRandomNumber()
{
return random.Next(1, 1000);
}
public Form1()
{
int randomNumber = random.Next(1, 1000);
InitializeComponent();
}
private void enterButton_Click(object sender, EventArgs e)
{
currentnum = Convert.ToInt32(guessBox.Text);
if (randomNumber < currentnum)
{
warmOrColdLabel.Text = "Too High";
if (currentnum > prevnum)
{
guessBox.BackColor = Color.Blue;
prevnum = currentnum;
}
else
{
guessBox.BackColor = Color.Red;
prevnum = currentnum;
}
}
if (randomNumber > currentnum)
{
warmOrColdLabel.Text = "Too Low";
if (currentnum > prevnum)
{
guessBox.BackColor = Color.Blue;
prevnum = currentnum;
}
else
{
guessBox.BackColor = Color.Red;
prevnum = currentnum;
}
}
if (randomNumber == currentnum)
{
guessBox.Enabled = false;
enterButton.Enabled = false;
playAgainButton.Enabled = true;
}
}
private void playAgainButton_Click(object sender, EventArgs e)
{
enterButton.Enabled = true;
guessBox.Enabled = true;
playAgainButton.Enabled = false;
}
}
The issue I have is getting a random number, it always puts out 0. I simply need a random number that I can put into different buttons and such. What am I doing wrong?
Edit: must be a random number between 1 and 1000.
You don't actually call RandomNumberHandler() anywhere. Also, you need to specify your range in the call to .Next() (e.g., random.Next(1000)+1 to get a number from 1 to 1000).
public partial class Form1 : Form
{
//other stuff from before
int randomNumber; //move this here
public Form1()
{
randomNumber = random.Next(1, 1000); //assign it here
InitializeComponent();
}
Main problem is randomNumber is initialized when the constructor is called, and thereafter when you access it you access the same value.
You should eliminate that instance variable, and instead simply make a new call to GenerateRandom().
In addition, you probably want to make your instance of Random a static variable:
static Random random =
Otherwise each time the class is unloaded and reloaded it will repeat the same sequence which would be less random (or rather, pseudo random).
Related
Hello I am currently trying to make a guessing game with windows form app in c#. I can not figure out how to make it so my random number only generates one time. For example every time I click my guess button (as shown in guessButton_Click) it generates a different random number. I just want the random number to be generated just once during this code run. How can I accomplish this? Any help is greatly appreciated!
public partial class randomNumberForm : Form
{
Random ranNum = new Random();
int userGuess = 0;
int numberOfGuesses = 0;
public randomNumberForm()
{
InitializeComponent();
}
public void randomNumberForm_Load(object sender, EventArgs e)
{
}
public void guessButton_Click(object sender, EventArgs e)
{
int randomNumber = ranNum.Next(101) + 1;
if (int.TryParse(inputTextBox.Text, out userGuess))
{
if (userGuess < randomNumber)
{
answerLabel.Text = "Too low, try again.";
numberOfGuesses++;
guessLabel.Text = numberOfGuesses.ToString();
}
else if (userGuess > randomNumber)
{
answerLabel.Text = "Too high, try again.";
numberOfGuesses++;
guessLabel.Text = numberOfGuesses.ToString();
}
else if (userGuess == randomNumber)
{
answerLabel.Text = "You guessed the right number!";
numberOfGuesses++;
guessLabel.Text = numberOfGuesses.ToString();
}
}
else
{
MessageBox.Show("Please enter a valid integer.");
}
}
Look at where you've placed the line int randomNumber = ranNum.Next(101) + 1; - it's the very first thing your button click event does, and it will run every single time the button is clicked.
Declare your randomNumber variable at the top of the class as a private int. This will make it a class variable which is only accessible from within the class itself.
Move your line of code randomNumber = ranNum.Next(101) + 1; into the randomNumberForm_Load function. This will populate the randomNumber variable on the form load event.
You must have a global variable.
see the example below
public partial class randomNumberForm : Form
{
Random ranNum = new Random();
int userGuess = 0;
int numberOfGuesses = 0;
int? randomNumber;
public randomNumberForm()
{
InitializeComponent();
}
public void randomNumberForm_Load(object sender, EventArgs e)
{
}
public void guessButton_Click(object sender, EventArgs e)
{
if (!randomNumber.HasValue) // first time run
randomNumber = ranNum.Next(101) + 1;
if (int.TryParse(inputTextBox.Text, out userGuess))
{
if (userGuess < randomNumber)
{
answerLabel.Text = "Too low, try again.";
numberOfGuesses++;
guessLabel.Text = numberOfGuesses.ToString();
}
else if (userGuess > randomNumber)
{
answerLabel.Text = "Too high, try again.";
numberOfGuesses++;
guessLabel.Text = numberOfGuesses.ToString();
}
else if (userGuess == randomNumber)
{
answerLabel.Text = "You guessed the right number!";
numberOfGuesses++;
guessLabel.Text = numberOfGuesses.ToString();
}
}
else
{
MessageBox.Show("Please enter a valid integer.");
}
}
Here is my current code:
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
public Random random = new Random();
public int[] randomInt = new int[20];
public double[] randomDouble = new double[20];
public string searchKey;
public int intOrDouble; // 0 if int, 1 if double
public static int Search<T>(T[] inputArray, T key) where T : IComparable<T>
{
for (int i = 0; i < 20; i++)
{
if (inputArray[i].CompareTo(key) == 0)
{
return i;
}
}
return -1;
}
public Form1()
{
InitializeComponent();
}
private void randomIntGeneration_Click(object sender, EventArgs e)
{
randomNumbersTextBox.Clear(); // empty the textbox
intOrDouble = 0; // this is for knowing which parameter to send to search method
// generate 20 random integers and display them in the textbox
for (int i = 0; i < 20; ++i)
{
randomInt[i] = random.Next(0, 100);
randomNumbersTextBox.Text += randomInt[i].ToString() + " ";
}
}
private void randomDoubleGenerator_Click(object sender, EventArgs e)
{
randomNumbersTextBox.Clear(); // empty the textbox
intOrDouble = 1; // this is for knowing which parameter to send to search method
// generate 20 random doubles and display them in the textbox
for (int i = 0; i < 20; ++i)
{
randomDouble[i] = random.NextDouble() + random.Next(0, 100);
randomNumbersTextBox.Text += randomDouble[i].ToString() + " ";
}
}
private void searchArrayButton_Click(object sender, EventArgs e)
{
searchKey = searchKeyTextBox.Text;
if(intOrDouble == 0) // int array passed
{
resultsTextBox.Text = Search(randomInt, searchKey).ToString();
}
else
{
resultsTextBox.Text = Search(randomDouble, searchKey).ToString();
}
}
}
}
What i am trying to do is use this generic method. The GUI allows the user to generate a random array of either ints or doubles. I then want to use the Search method in the searchArrayButton_Click control to display whether or not the "searchKey" value entered is in the array. The error I am getting is "The type arguments for method 'Form1.Search(T[], T)' cannot be inferred from the usage. Try specifying the type arguments explicitly." They appear toward the bottom of the code when I try to call Search twice in the searchArrayButton_Click control.
You're trying to search an array of int or double values for a string. As a result, your call to Search has two arguments with two different types. That doesn't match the function signature.
You need to convert whatever is in that textbox into the value you are searching for, either an int or a double.
if(intOrDouble == 0) // int array passed
{
resultsTextBox.Text = Search(randomInt, int.Parse(searchKey)).ToString();
}
else
{
resultsTextBox.Text = Search(randomDouble, double.Parse(searchKey)).ToString();
}
Ok I'm trying to make a GUI dice game where the dice numbers are represented in textboxes.
I have to create a class that represents the dice and at least one of my methods has to correctly pass parameters by reference. My problem is that I am not too experienced with classes or passing parameters
I get an error at
rd.RollDice1(ref dice1);
rd.RollDice2(ref dice2);
(I am sure I have not constructed the RollDice class incorrectly)
Please is there anyone that can help me?
here is my code so far:
public partial class Form1 : Form
{
private RollDice rd;
public Form1()
{
InitializeComponent();
rd = new RollDice();
}
private void button1_Click(object sender, EventArgs e)
{
int dice1, dice2;
const int EYE = 1;
const int BOX = 6;
rd.RollDice1(ref dice1);
rd.RollDice2(ref dice2);
string result = string.Format("{0}", dice1);
string result2 = string.Format("(0)", dice2);
textBox1.Text = result;
textBox2.Text = result;
if (dice1 == EYE && dice2 == BOX)
{
MessageBox.Show("You rolled a Snake Eyes!");
}
if (dice1 == BOX && dice2 == BOX)
{
MessageBox.Show("You rolled BoxCars!");
}
else
{
MessageBox.Show("You rolled a {0} and a {1}", dice1, dice2);
}
}
}
}
class RollDice
{
const int EYE = 1;
const int BOX = 6;
public int RollDice1(ref int dieValue1)
{
Random randomNums = new Random();
dieValue1 = randomNums.Next(1, 7);
return dieValue1;
}
public int RollDice2(ref int dieValue2)
{
Random randomNums = new Random();
dieValue2 = randomNums.Next(1, 7);
return dieValue2;
}
}
}
Passing a variable with ref requires that variable to be initialized with a default value. If you don't set the two dices with an initial value your compiler complains about "Use of unassigned local variable xxxxx"
private void button1_Click(object sender, EventArgs e)
{
const int EYE = 1;
const int BOX = 6;
int dice1 = EYE;
int dice2 = BOX;
rd.RollDice1(ref dice1);
rd.RollDice2(ref dice2);
.....
However looking at your code there is no need to pass that values using ref, you could simply get the return value
dice1 = rd.RollDice1();
dice2 = rd.RollDice2();
of course you should change the two methods in your class to remove the parameter passed by ref
class RollDice
{
Random randomNums = new Random();
public int RollDice1()
{
return randomNums.Next(1, 7);
}
public int RollDice2()
{
return randomNums.Next(1, 7);
}
}
Hi so I am new to programing I just started school and I wanted to get a head start on programing so please keep in mind that everything I show you is all self-taught. Here is my question I wanted to make a random number guessing game and for the most part it works but every time you click the button to guess it randoms a different number which I don’t want here is what I have so far
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
// number of guesses
int numberOfGesses = 0;
private void btnCalc_Click(object sender, EventArgs e)
{
// make the generator
Random generator = new Random();
//make the number
int number = generator.Next(1, 10);
// get the users guess
int guess = int.Parse(txtInput.Text);
//check the users guess
if (guess == number)
{
lblAnswer.Text = "You got it";
numberOfGesses = 0;
}
else if (guess != number)
{
numberOfGesses = numberOfGesses + 1;
lblAnswer.Text = "try agian you have gessed" + (numberOfGesses) + " times";
}
}
}
I know it keeps creating a new number because every time I press the guess button it starts from the top and makes a new number. I tried to take this block and make it global but I got an error
// make the generator
Random generator = new Random();
//make the number
int number = generator.Next(1, 10);
again im realy new and i found this site when lookinging up some qeustions i had so i thought it would be a good place to help me learn about programing while i wait till i can get into the programing classes thank you for your time.
You likely got an error because C# doesn't allow you to assign a default value of a field based on another field.
public partial class Form1 : Form {
int numberOfGuess = 0;
Random generator = new Random();
int number;
// other methods
}
generator can be initialized before or after number, hence the error. Instead, you can put it in the form intializer (Form1 method), or make another button and click it and generate a new random number:
public partial class Form1 : Form
{
// number of guesses
int numberOfGesses = 0;
Random generator = new Random();
int number;
public Form1()
{
InitializeComponent();
// Generate the random number
number = generator.Next(1, 10);
}
private void btnRandom_Click(object sender, EventArgs e)
{
// Generate a new random number when you click a button on the form
number = generator.Next(1, 10);
}
private void btnCalc_Click(object sender, EventArgs e)
{
// get the users guess
int guess = int.Parse(txtInput.Text);
//check the users guess
if (guess == number)
{
lblAnswer.Text = "You got it";
numberOfGesses = 0;
}
else if (guess != number)
{
numberOfGesses = numberOfGesses + 1;
lblAnswer.Text = "try agian you have gessed" + (numberOfGesses) + " times";
}
}
}
You cannot use an instance variable to initialize another instance variable. Why? Because the compiler can rearrange these - there is no guarantee that generator will be initialized before number, so the above line might throw a NullReferenceException.
So change the default number value to 0:
Random generator = new Random();
int number = 0;
Initialise in the constructor:
public Form1()
{
InitializeComponent();
number = generator.Next(1, 10);
}
When the button is clicked generate the number since here you will be needing it:
private void btnCalc_Click(object sender, EventArgs e)
{
//take the input & Compare as before.
}
I'm new to coding and am creating a windows form application in C#. I was having difficulties figuring out how to track the number of correct and incorrect responses. When a button is clicked, if the response is correct a label says correct. I want a different label to count the amount of times it says correct and incorrect. Here's what I was thinking but didn't work.
int add = 0;
add = int.Parse(correct.Text);
if (label1.Text == "Correct")
{
correct.Text = add++;
}
else
incorrect.text = add++;
correct and incorrect are names of my label.
Here's my button click event, there are many alike.
private void G_Click(object sender, EventArgs e)
{
if (go.Visible == true)
{
go.Visible = false;
Random rnd = new Random();
int y = rnd.Next(1, 7);
if (y == 1)
{
eo.Visible = true;
}
if (y == 2)
{
ao.Visible = true;
}
if (y == 4)
{
dd.Visible = true;
}
if (y == 5)
{
go.Visible = true;
}
if (y == 6)
{
eeo.Visible = true;
}
timer1.Start();
label1.Text = "Correct";
}
else
{
label1.Text = "Incorrect";
}
private int correctCount = 0;
private int incorrectCount = 0;
if (label1.Text = "Correct";)
{
correctCount++;
correct.Text = correctCount.ToString();
}
else
{
incorrectCount++;
incorrect.Text = incorrectCount.ToString();
}
The immediate problem is that the type of the Text property is string, not int - you have to set it to text, not a number. Fortunately, you can just call ToString on an int to get a string representation. However, I'd suggest there are other things to change too.
I would strongly suggest that you keep separate counters as variables. While you could keep parsing your labels, it's simpler for them to be purely output. So you might have:
// Fields
private int correctCount = 0;
private int incorrectCount = 0;
...
// Wherever your code is
if (correctAnswer)
{
correctCount++;
correct.Text = correctCount.ToString();
}
else
{
incorrectCount++;
incorrect.Text = incorrectCount.ToString();
}
Note the correctAnswer condition here - we don't know what's setting the text of label1, but I'd suggest that that's the right place to also change the correct/incorrect counters, from the same condition. Again, treat label1 just as output, rather than as a feedback system.
class fields = variables that are declared outside of a method and directly inside a class
local variables = variables that are declared inside of a method
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace deleteMe
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private int correctCount = 0; // field
private int incorrectCount = 0; // field
private void G_Click(object sender, EventArgs e)
{
if (go.Visible == true)
{
go.Visible = false;
Random rnd = new Random();
int y = rnd.Next(1, 7); // local variable
if (y == 1)
{
eo.Visible = true;
}
if (y == 2)
{
ao.Visible = true;
}
if (y == 4)
{
dd.Visible = true;
}
if (y == 5)
{
go.Visible = true;
}
if (y == 6)
{
eeo.Visible = true;
}
timer1.Start();
incorrect.Text = "Correct";
}
else
{
incorrect.Text = "Incorrect";
}
if (label1.Text = "Correct")
{
correctCount++;
correct.Text = correctCount.ToString();
}
else
{
incorrectCount++;
incorrect.Text = incorrectCount.ToString();
}
}
}
}
== equality. (for comparing 2 values)
= assign a value. (for initialize a variable or field)