我必须做一个比萨饼游戏...我已经编写了所有的代码..它似乎正常工作。问题是我的数字没有出现，因为他们认为...我知道我的错误是在我计算俗气的地壳时....有人可以帮忙！
如果顾客选择添加俗气外壳（除了薄而脆的东西），那么将以下内容添加到披萨的基本价格中：
k = ec
where:
k = total cost of cheesy crust (dollars)
e = size of pizza crust (inches)
c = cost of materials (dollars per square inch - 0.02)
比萨饼外壳的大小是比萨饼边界的尺度：
for round pizzas: e = 2π(d/2) (the circumference)
for rectangular pizzas: e = 2(L+w) (the perimeter)
where
e = size of pizza crust (inches)
d = diameter of round pizza (inches)
L = length of rectangular pizza (inches)
w = width of rectangular pizza (inches)
enter code here
import java.util.Scanner;
public class Pizza {
/*
* calculates price including tax
* @return double
*/
public static double calculatePriceWithTax(double price){
return price * (1 + 0.07);
}
/*
* calculates delivery fee if any
* @return double
*/
public static double deliveryFee(double price){
if(price < 10){
return 3;
}
else if(price >= 10 && price <= 20){
return 2;
}
else if(price >= 20 && price <= 30){
return 1;
}
else{
return 0;
}
}
/*
* calculates basic pricing for total number of pizza
* @return double
*/
public static double calculateCost(int shape, int diameter, int length, int width, int numToppings, int typeDough){
double a = area(shape, diameter, length, width);
double v = volume(a, typeDough);
double cost = a * (0.036 + numToppings * 0.025 ) + v * 0.019;
return cost;
}
/*
* calculates area of a pizza
* @return double
*/
public static double area(int shape, int diameter, int length, int width){
double a = 0.0;
if(shape == 1){ // round pizza
a = Math.PI * (diameter / 2) * (diameter / 2);
}
else if(shape == 2){ // rectangular pizza
a = length * width;
}
return a;
}
/*
* calculates volume of a pizza
* @return double
*/
public static double volume(double a, int typeDough){
double height = 0.0;
switch(typeDough){
case 1:
height = 0.1;
break;
case 2:
height = 0.25;
break;
case 3:
height = 0.5;
break;
case 4:
height = 0.9;
break;
}
return a * height;
}
/*
* calculates cost for cheesy crust
* @return double
*/
public static double calculateChessyCrustCost(int shape, int diameter, int length, int width){
return size(shape, diameter, length, width) * 0.02;
}
/*
* calculates size of pizza
* @return double
*/
public static double size(int shape, int diameter, int length, int width){
if(shape == 1){ // round pizza
return 2 * Math.PI * (diameter / 2);
}
else{ // rectangular pizza
return 2 * (length + width);
}
}
public static void main(String[] args) {
int shape; // 1 => round, 2 => rectangular
int length = 0;
int width = 0;
int diameter = 0;
int numToppings = 0; // number of toppings
int typeDough; // 1 => thin & crusty, 2 => hand tossed, 3 => pan, 4 => texas toast
boolean cheesyCrust = false; // true => add, false => don't add
int lengthCrust = 0;
int numPizza; // number of pizzas ordered
int orderType; // 1 => delivery, 2 => take-out
Scanner scanner = new Scanner(System.in);
System.out.println("This program helps you to order pizza based on your personal preferences.");
System.out.println("It notes your choices and calculates total cost for you, including tax and even delivery fee if applicable.");
System.out.println("Please fill out information for the following:");
System.out.println();
System.out.println("Pizza style:");
System.out.println("1. Round Pizza");
System.out.println("2. Rectangular Pizza");
shape = scanner.nextInt();
if(shape == 1){
System.out.println("Diameter:(inches)");
diameter = scanner.nextInt();
}
else if(shape == 2){
System.out.println("Length:(inches)");
length = scanner.nextInt();
System.out.println("Width:(inches)");
width = scanner.nextInt();}
else {throw new IllegalArgumentException("Enter enter 1 fo Round pizza or 2 for rectangualar pizza");
}
System.out.println("Number of toppings:");
numToppings = scanner.nextInt();
System.out.println("Type of dough:");
System.out.println("1. Thin & Crusty");
System.out.println("2. Classic Hand Tossed");
System.out.println("3. Pan");
System.out.println("4. Texas Toast");
typeDough = scanner.nextInt();
if(typeDough != 1){
System.out.println("Do you want to add cheest crust?[true/false]");
cheesyCrust = scanner.nextBoolean();
}
System.out.println("How many pizzas do you want to order?");
numPizza = scanner.nextInt();
System.out.println("Select your receival method:");
System.out.println("1. Delivery");
System.out.println("2. Take away");
orderType = scanner.nextInt();
double a = area(shape, diameter, length, width);
double v = volume(a, typeDough);
double baseCost = calculateCost(shape, diameter, length, width, numToppings, typeDough);
double crustCost = 0.0;
if(cheesyCrust == true){
crustCost = calculateChessyCrustCost(shape, diameter, lengthCrust, width);
}
double costOne = calculatePriceWithTax(baseCost + crustCost);
double deliveryCharge = 0.0;
if(orderType == 1){ // delivery
costOne += deliveryFee(costOne);
}
double totalCost = deliveryFee(costOne * numPizza) + (costOne * numPizza);
System.out.print("Area: ");
System.out.printf("%.2f", a);
System.out.print(" (inches square)");
System.out.println();
System.out.print("Volume:");
System.out.printf("%.2f", v);
System.out.print(" (cubic inches)");
System.out.println();
System.out.print("Base Cost: ");
System.out.printf("%.2f", baseCost);
System.out.print(" dollar");
System.out.println();
System.out.print("Cost for one pizza: ");
System.out.printf("%.2f", costOne);
System.out.print(" dollar");
System.out.println();
System.out.print("Your order has been processed. Total cost including taxes: ");
System.out.printf("%.2f", totalCost );
System.out.print(" dollars");
System.out.println();
System.out.println("Thank you for using our service.");
}
}
答案 0 :(得分：2)
问题1在您的area方法中：
a = Math.PI * (diameter / 2) * (diameter / 2);
在java中，int / int = int，所以你必须把它强制转换为双倍。
要解决此问题，请尝试以下操作：
a = Math.PI * (diameter / 2.0d) * (diameter / 2.0d);
同样的问题出在您的size方法中。它应该是这样的：
return 2 * Math.PI * (diameter / 2.0d);