Write a program that simulates a vending machine. The machine holds six snack items labeled them 1 through 6. The program should initially display a menu of items along with their prices: Vending Machine 1. Roasted Almonds --> $1.25 2. Pretzels --> $1.75 3. Chewing Gum --> $0.90 4. Mints --> $0.75 5. Chocolate bar --> $1.50 6. Cookies --> $2.00 The program then should ask the user to enter the item to purchase along with a sum of money. If the money is enough to buy the item, your program should display the name of item purchased along with the change owed to the user (if any). If the money inserted is insufficient, then your program should say so and let the user know how much additional money is needed. Your program must display the money amounts using the dollar sign and two decimal places after the decimal point. Please note that your program must validate the input given by the user: The item to purchase an the amount of money are numeric values (e. g. int and float) If the user enters an invalid choice for an item to purchase, your program should alert the user of the error. The program should not accept negative values for the sum of money.

This question involves a class named textfile that represents a text file. public class textfile { private string filename; private string filename; private arraylist words; // constructors not shown // postcondition: returns the number of bytes in this file public int filesize() { } // precondition: 0 < = index < words. size() // postcondition: removes numwords words from the words arraylist beginning at // index. public void deletewords(int index, int numwords) { } // precondition: 0 < = index < = words. size() // postcondition: adds elements from newwords array to words arraylist beginning // at index. pub lic voidaddwords(int index, string[] newwords) { } // other methods not shown } complete the filesize() method. the filesize() is computed in bytes. in a text file, each character in each word counts as one byte. in addition, there is a space in between each word in the words arraylist, and each of those spaces also counts as one byte. for example, suppose the words arraylist stores the following words: { mary had a little lamb; its fleece was white as snow. } the filesize() method would compute 4 + 3 + 1 + 6 + 5 + 4 + 6 + 3 + 5 + 2 + 5 as the sum of the lengths of each string in the arraylist. the value returned would be this sum plus 10, because there would also be 10 spaces in between the 11 words. complete the filesize() method below: // postcondition: returns the number of bytes in this file public int filesize() { }