Modify the program you wrote in programming challenge 19 so that it reports the

Question

Modify the program you wrote in programming challenge 19 so that it reports the number of pizzas you need to buy for a party if each person attending is expected to eat an average of 4 slices. The program should ask the user for the number of people who will be at the party and for the diameter of the pizzas to be ordered. it should then calculate and display the number of pizzas to purchase. Because it is is impossible to buy a part of a pizza, number of required pizzas should be displaed as a whole number.

Explanation / Answer

import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    int radius, people; // initialize radius and people variable
    Scanner scan = new Scanner(System.in); // Create a new Scanner object
    System.out.println("Enter amount of people: ");
    people = scan.nextInt(); //people = the next int we get as our input from the scanner
    System.out.print("Enter pizza diameter: ");
    radius = scan.nextInt() / 2; // radius = diameter divided by 2
    scan.close(); // Close the scanner, we are done with it
    double area = Math.PI * radius * radius; // area of circle = pi*r^2
    double slices = area / 14.125; // slices = area divided by 14.125
    double pizza = people * slices / 4; // pizza = people coming to party times the amount of slices you have, divided by 4 since for every 1 person we need 4 slices
    System.out.println("Pizzas to be ordered: " + pizza); // print result
  }
}

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