List boxes: List box controls help to show the list of items which enables the user to choose an item from the list. The user may choose one of the items from the list, causing the item to appear selected at runtime. The selected items will be displayed on ListBox control. Get the items from ListBox control: The item which is selected by user from ListBox is stored into ListBox’s SelectedItem property. Steps to determine the selected item in Listbox: If anyone tries to get the value when ListBox’s SelectedItem is empty, then it will occur with an exception. Always ensure that item is selected before reading an item in the SelectedItem. The items stored in ListBox with index value. This is done by “SelectedIndex” property. The item index is stored into SelectedIndex property. The index is a number to determine the position of Items in ListBox. If first item means index value is “0”, second means “1”, and so on. If there is no item in ListBox, then the index value is set to “-1”. The following example code checks whether the SelectedIndex property is “-1” or not. if(courseListBox.SelectionIndex != -1) { selectedProduct = productListBox.SelectedItem.ToString(); }

Question

Adding Students to a Club Create an application that displays a list of student names in a ListBox. Use a second empty ListBox to represent the members of a student club. Use a button labeled Addto copy member names from the general list to the club list. Use a button labeled Remove to remove a student from the club list. Keep a running count of the number of names in the club list. The application should perform the following error-checking:• Do not permit the same person’s name to be added twice.• Avoid throwing an exception if the user clicks the Add button before having selected a student name.• Avoid a runtime error if the user clicks the Remove selected member button, without having selected a member name In "Starting out with visual basic 8th edition programming challenge 5"

Answer 1

Question

Chapter 4, Problem 9AW

Program Plan Intro

List boxes:

List box controls help to show the list of items which enables the user to choose an item from the list.

The user may choose one of the items from the list, causing the item to appear selected at runtime.

The selected items will be displayed on ListBox control.

Get the items from ListBox control:

The item which is selected by user from ListBox is stored into ListBox’s SelectedItem property.

Steps to determine the selected item in Listbox:

If anyone tries to get the value when ListBox’s SelectedItem is empty, then it will occur with an exception.

Always ensure that item is selected before reading an item in the SelectedItem. The items stored in ListBox with index value.

This is done by “SelectedIndex” property.

The item index is stored into SelectedIndex property.

The index is a number to determine the position of Items in ListBox.

If first item means index value is “0”, second means “1”, and so on. If there is no item in ListBox, then the index value is set to “-1”.

The following example code checks whether the SelectedIndex property is “-1” or not.

if(courseListBox.SelectionIndex != -1)

{

selectedProduct = productListBox.SelectedItem.ToString();

}

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Adding Students to a Club Create an application that displays a list of student names in a ListBox. Use a second empty ListBox to represent the members of a student club. Use a button labeled Addto copy member names from the general list to the club list. Use a button labeled Remove to remove a student from the club list. Keep a running count of the number of names in the club list. The application should perform the following error-checking:• Do not permit the same person’s name to be added twice.• Avoid throwing an exception if the user clicks the Add button before having selected a student name.• Avoid a runtime error if the user clicks the Remove selected member button, without having selected a member name In "Starting out with visual basic 8th edition programming challenge 5"

How do you read the currently chosen item from a ListBox without throwing an exception if no item is selected?

C++HurdleWords The HurdleWords class is mostly provided to you. HurdleWords is constructed from two files in the data/ folder: ● valid_guesses.txt (all 5 letter guesses considered to be valid words to guess), and ● valid_hurdles.txt (all words that may be selected to be the secret Hurdle.) ● Note: you may edit both text files if you’d like to add custom words to your game. HurdleWords stores all potential valid Hurdles from valid_hurdles.txt into a vector of strings (valid_hurdles_), and all valid guesses from valid_guesses.txt into an unordered set of strings (valid_guesses_). A set is simply a data structure that contains no duplicates and allows for a speedy lookup to check if a given element exists within the set. Because there are over 10,000 valid guesses, we store them in an unordered set to leverage their speediness, as you will need to check if a user-submitted guess is considered valid (i.e. their guess is considered a valid guess in the dictionary). You are responsible for…