Question

Write a program that calculates tip amount from a restaurant bill. You enter the bill amount and the program will calculate the tax (10%) and fill out the amount for Tax and Total before Tip. Tip Percent is a Combo box which you select a tip percentage. The tip percentage will be typed in the Item property of Tip Percent Combo box. Once tip percent has been selected, you can click on the button (Calculate Tip) to display the tip. In this program, you will create a heading label, 5 labels associated with 5 text boxes and one button. See the figure below as reference. You need to create 2 event handlers which are 1. Bill Amount text box TextChanged event a. Validate the number is not negative b. Validate the input is number, not letters c. Once a good input is received, update the tax box, bill before tip box 2. Calculate tip button Click event a. Validate bill amount has been entered b. Validate that Tip percentage has been selected c. Calculate tip and display it in tip text box. Some other property changes 1. The textbox for tax, bill before tip, and tip should be read only 2. Tip percentage are fixed 3 values, 15%, 18% and 20%

Answer 1

A program that calculates the total bill including tip and tax requires users to input a bill amount, select a tip percentage, and then calculates the required amounts. It includes validation and real-time updating of related fields, with specific event handlers for user inputs.

Step-by-step explanation:

Program for Calculating Total Bill Including Tip and Tax

To write a program that calculates the tip amount from a restaurant bill, you will first need to allow the user to input the bill amount. The program will then calculate a 10% tax and update the tax and total before tip fields. Users select a tip percentage from a Combo box with predefined values of 15%, 18%, and 20%. When the 'Calculate Tip' button is clicked, the program validates input, calculates the tip using the selected percentage, and displays the total tip amount.

The event handlers required for this program will include one for the TextChanged event of the Bill Amount text box for input validation and real-time updating of the tax field. The second event handler is for the Click event of the 'Calculate Tip' button to calculate and display the tip based on the selected tip percentage and validated bill amount.

The text boxes for tax, bill before tip, and tip should be set to read-only. The tip percentage Combo box will contain three fixed values for the user to choose from.

Example Calculation:

For a $47.50 bill with a 6% sales tax and an 18% tip:

• 
  
• 
  
• 
  
•