import java.util.Scanner;
import java.lang.Math;
public class pizzasMazboudi
{
public static void main(String[] args)
{
double shapeOfPizza;
double toppings;
double pizzaCrust;
double baseCost;
double areaOfPizza;
double numberOfToppings;
final double COST_OF_ONE_TOPPING = 0.025;
final double COST_OF_DOUGH = 0.019;
final double COST_OF_SAUCE = 0.036;
double diameterOfPizza;
double lengthOfPizza;
double widthOfPizza;
double volumeOfDough;
final double THIN_AND_CRISPY = .1;
final double PAN = .5;
final double CLASSIC_HAND_TOSSED = .25;
final double TEXAS_TOAST = .9;
double sizeOfCrust;
double cheesyCrust;
final double COST_OF_MATERIALS = .02;
double numberOfPizzas;
double costOfDelivery;
double tax;
double pizzaDelivery;
final double PI = 3.14159;
double typeOfCrust;
double costOfCheesyCrust;
double costOfPizzaDelivery;
Scanner keyboard = new Scanner(System.in);
System.out.println("Hello customer! Welcome to Guiseppi's Just Pizza!");
System.out.println("Where we make the pizza just for you!");
System.out.println("\n What kind of pizza do you want on" +
" this beautiful day?");
do
{
System.out.print("Press 1 for a square pizza,");
System.out.print(" or press 2 for a circle pizza: ");
shapeOfPizza = keyboard.nextDouble();
if(shapeOfPizza != 1 && shapeOfPizza != 2)
{
System.out.println("That is an incorrect input, please enter 1 or 2");
}
}
while(shapeOfPizza != 1 && shapeOfPizza != 2);
if(shapeOfPizza == 1)
{
System.out.println("And how big would you like your pizza?");
do
{
System.out.print("Please enter the length of your pizza (under 60 inches: ");
lengthOfPizza = keyboard.nextDouble();
if(lengthOfPizza > 60 && lengthOfPizza < 0)
{
System.out.println("That is an incorrect input, please enter a number between 0 and 60");
}
}
while(lengthOfPizza > 60 && lengthOfPizza < 0);
do
{
System.out.print("Please enter the width of your pizza: ");
widthOfPizza = keyboard.nextDouble();
if(widthOfPizza >60 && widthOfPizza <0)
{
System.out.println("That is an incorrect input, please enter a number between 0 and 60.");
}
}
while(widthOfPizza > 60 && widthOfPizza < 0);
areaOfPizza = lengthOfPizza * widthOfPizza;
System.out.println("Your pizza is " + areaOfPizza + "inches large");
sizeOfCrust = 2 * (lengthOfPizza + widthOfPizza);
}
else if(shapeOfPizza == 2)
{
System.out.println("And how big would you like your pizza?");
do
{
System.out.print("Please enter the diameter of your pizza: ");
diameterOfPizza = keyboard.nextDouble();
if(diameterOfPizza > 60 && diameterOfPizza <= 0)
{
System.out.println("That is an incorrect input, please enter a number that is between 0 and 60.");
}
}
while(diameterOfPizza > 60 && diameterOfPizza <= 0);
sizeOfCrust = 2*PI*(diameterOfPizza/2);
areaOfPizza = PI*((diameterOfPizza/2)*(diameterOfPizza/2));
System.out.println("The area of your pizza is" + areaOfPizza + " inches large");
}
System.out.println("What type of crust would you like?");
do
{
System.out.println("Enter 1 for Thin and Crispy, 2 for Pan,");
System.out.println("3 for Classic Hand-Tossed, and 4 for Texas Toast");
pizzaCrust = keyboard.nextDouble();
if(pizzaCrust != 2 && pizzaCrust != 3 && pizzaCrust != 4)
{
System.out.println("That is an incorrect input, please enter 1, 2, 3, or 4");
}
}
while(pizzaCrust != 2 && pizzaCrust != 3 && pizzaCrust != 4);
if(pizzaCrust == 1);
{
typeOfCrust = THIN_AND_CRISPY;
}
if(pizzaCrust == 2);
{
typeOfCrust = PAN;
}
if(pizzaCrust == 3);
{
typeOfCrust = CLASSIC_HAND_TOSSED;
}
if(pizzaCrust == 4);
{
typeOfCrust = TEXAS_TOAST;
}
if(pizzaCrust == 2 && pizzaCrust == 3 && pizzaCrust == 4)
{
System.out.println("Would you like to try our new cheesy crust today?");
do
{
System.out.print("Enter 1 for yes or 2 for no");
cheesyCrust = keyboard.nextDouble();
if(cheesyCrust != 1 && cheesyCrust != 2)
{
System.out.println("That is an incorrect input, please enter 1 or 2");
}
}
while(cheesyCrust != 1 && cheesyCrust != 2);
}
System.out.println("Would you like any toppings today?");
do
{
System.out.println("Enter 1 for toppings, enter 2 if you do not want toppings");
toppings = keyboard.nextDouble();
if(toppings != 1 && toppings !=2)
{
System.out.println("That is an incorrect input, please enter 1 or 2");
}
}
while(toppings != 1 && toppings !=2);
if(toppings == 1)
{
do
{
System.out.println("How many toppings do you want? (10 toppings limit)");
numberOfToppings = keyboard.nextDouble();
if(numberOfToppings <=0 && numberOfToppings > 10)
{
System.out.println("That is an incorrect input, please enter a number 1 through ten");
}
}
while(numberOfToppings <=0 && numberOfToppings > 10);
}
do
{
System.out.println("How many identical pizza's would you like?");
numberOfPizzas = keyboard.nextDouble();
if(numberOfPizzas <= 0)
{
System.out.println("That is an incorrect input, please enter a number above 0");
}
}
while(numberOfPizzas <= 0);
System.out.println("Will you come pick up your order, or will you like delivery?");
do
{
System.out.println("Enter 1 for delivery, enter 2 for pick-up");
pizzaDelivery = keyboard.nextInt();
if(pizzaDelivery != 1 && pizzaDelivery != 2)
{
System.out.println("That is an incorrect input, please enter a 1 or 2");
}
}
while(pizzaDelivery != 1 && pizzaDelivery != 2);
costOfCheesyCrust = sizeOfCrust * COST_OF_MATERIALS;
volumeOfDough = typeOfCrust * areaOfPizza;
baseCost = areaOfPizza * (COST_OF_SAUCE + numberOfToppings * COST_OF_ONE_TOPPING) + COST_OF_DOUGH * volumeOfDough;
if(cheesyCrust == 1)
{
costOfCheesyCrust = sizeOfCrust * COST_OF_MATERIALS;
baseCost = baseCost + costOfCheesyCrust;
}
if(pizzaDelivery == 1)
{
if(baseCost < 10)
{
costOfPizzaDelivery = 3.00;
}
else if(baseCost < 20 || baseCost >= 10)
{
costOfPizzaDelivery = 2.00;
}
else if(baseCost < 30 || baseCost >= 20)
{
costOfPizzaDelivery = 1.00;
}
else if(baseCost >= 30)
{
costOfPizzaDelivery = 0;
}
}
}
}
因此，当我尝试编译时，变量numberOfTopping，areaOfPizza和sizeOfCrust都是错误的原因，因为＆＃34;它们没有被初始化＆＃34;，但我已经将它们全部定义为双精度和将numberOfTopping设置为keyboard.nextDouble并给出其他2个公式，任何帮助将不胜感激。
答案 0 :(得分：3)
编译器是正确的。
numberOfToppings在您的标头中定义，但是如果toppings == 1
稍后当您计算baseCost时，您使用numberOfToppings的值，此时代码中的用户可能选择不进行任何配料，而numberOfToppings已从未被分配过初始值。
为避免这种情况，您应该在标题中将变量初始化为所需的默认值 0 。
double numberOfToppings = 0;
这同样适用于您提及的其他人，原因相同。根据用户输入，这些变量可能永远不会被初始化，但您仍然会尝试在最终计算中使用它们;你应该把它们全部初始化。
作为旁注，您应该学会在IDE中使用自动格式化程序，以获得更好的代码可读性。
答案 1 :(得分：0)
在声明这些变量时，应该使用一些默认值初始化这些变量。
您的代码很乱，但这些变量可能永远不会根据用户输入设置，所以基本上您不能使用未初始化的变量。
作为最佳实践，在使用之前不要声明局部变量，这可能会导致增加其范围。当您需要使用变量时，应立即声明并初始化它。