VB.Net user's number guessing game

Question

I want to make a VB.Net program for my assignment which guesses the user's number using the halving method. However, I have encountered a few problems with my program.

Here is the code:

 
    Dim intGuess As Integer = 50
    Dim minimum As Integer = 1
    Dim maximum As Integer = 100

 
    Private Sub btnStart_Click(sender As Object, e As EventArgs) Handles btnStart.Click
        btnStart.Enabled = False
        lblGuess.Text = $"Is your number {intGuess} ?"
    End Sub

  
    Private Sub btnLower_Click(sender As Object, e As EventArgs) Handles btnLower.Click
        intGuess = intGuess - (intGuess/ 2)
        lblGuess.Text = $"Is your number {intGuess} ?"
    End Sub

    
    Private Sub btnHigher_Click(sender As Object, e As EventArgs) Handles btnHigher.Click
        intGuess = intGuess + (intGuess / 2)
        lblGuess.Text = $"Is your number {intGuess} ?"
    End Sub

However the problem is, usually when I press the button that makes the computer guess higher, it will go above 100, and I was wondering how I could tackle this.

Additionally, another problem is that (if for example, I guessed 20) and I keep hitting buttons based on if it should be higher or lower, I will never reach the answer of 20. So if someone could please explain to me what I have done wrong, I would be very grateful!

Answer 1

With an item in the list, you add a boolean variable to check if it is selected or not.

class Model {
  String name;
  bool isSelected;
}