代码：
import java.io.*;
import java.text.*;
import java.util.*;
public class JavaBurger
{
public static double amountowed = 0;
public static double amount;
public static double amount1 = 0;
public static double amount2 = 0;
public static double amount3 = 0;
public static double amount4 = 0;
public static double amount5 = 0;
public static double amount6 = 0;
public static double amount7 = 0;
public static double amount8 = 0;
public static double amount9 = 0;
public static double amount10 = 0;
static ArrayList MenuItems = new ArrayList();
public static void main(String[] args)
{
InputStreamReader inp = null;
BufferedReader input = null;
int nOption = 0;
DecimalFormat x = new DecimalFormat("###.##");
try
{
inp = new InputStreamReader(System.in);
input = new BufferedReader(inp);
while(true)
{
System.out.println("Choose a Menu Option");
System.out.println("1. Burger - 13.49");
System.out.println("2. Pasta - 16.79");
System.out.println("3. Salad - 13.49");
System.out.println("4. Salmon - 18.99");
System.out.println("5. Chicken - 16.99");
System.out.println("6. Nachos - 13.99");
System.out.println("7. Soup - 6.99");
System.out.println("8. Fajitas - 18.49");
System.out.println("9. Ribs - 23.99");
System.out.println("10. Calamari-9.99");
System.out.println("11. Clear Order");
System.out.println("12. Finish Order");
System.out.println("\nChoose an option(1-12) >> ");
System.out.println("Subtotal: $" + x.format(amount));
System.out.println("Total: $" + x.format(amount * 1.13));
System.out.println("For error correction, choose an option and enter a negative value to void the item.");
nOption = Integer.parseInt(input.readLine());
switch(nOption)
{
case 1:
Burger(input);
break;
case 2:
Pasta(input);
break;
case 3:
Salad(input);
break;
case 4:
Salmon(input);
break;
case 5:
Chicken(input);
break;
case 6:
Nachos(input);
break;
case 7:
Soup(input);
break;
case 8:
Fajitas(input);
break;
case 9:
Ribs(input);
break;
case 10:
Calamari(input);
break;
case 11:
Clear(input);
break;
case 12:
Finish(input);
break;
}
}
}
catch(Exception exp)
{
}
}
private static void Burger(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many Burgers would you like? ");
int a = Integer.parseInt(input.readLine());
double aaa = Math.pow(1 + a, a);
amount1 = (a * 13.49);
amount += amount1;
break;
}
}
private static void Pasta(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many orders of Pasta would you like? ");
int b = Integer.parseInt(input.readLine());
double bbb = Math.pow(1 + b, b);
amount2 = (bbb * 16.79);
amount += amount2;
break;
}
} private static void Salad(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many Salads would you like? ");
int c = Integer.parseInt(input.readLine());
double ccc = Math.pow(1 + c, c);
amount3 = (ccc * 13.49);
amount += amount3;
break;
}
} private static void Salmon(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many orders of Salmon would you like? ");
int d = Integer.parseInt(input.readLine());
double ddd = Math.pow(1 + d, d);
amount4 = (ddd * 18.99);
amount += amount4;
break;
}
} private static void Chicken(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many orders of Chicken would you like? ");
int e = Integer.parseInt(input.readLine());
double eee = Math.pow(1 + e, e);
amount5 = (eee * 16.99);
amount += amount5;
break;
}
} private static void Nachos(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many orders of Nachos would you like? ");
int f = Integer.parseInt(input.readLine());
double fff = Math.pow(1 + f, f);
amount6 = (fff * 13.99);
amount += amount6;
break;
}
} private static void Soup(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many orders of Soup would you like? ");
int g = Integer.parseInt(input.readLine());
double ggg = Math.pow(1 + g, g);
amount7 = (ggg * 6.99);
amount += amount7;
break;
}
} private static void Fajitas(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many orders of 2 Fajitas would you like? ");
int h = Integer.parseInt(input.readLine());
double hhh = Math.pow(1 + h, h);
amount8 = (hhh * 18.49);
amount += amount8;
break;
}
} private static void Ribs(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many racks of Ribs would you like? ");
int i = Integer.parseInt(input.readLine());
double iii = Math.pow(1 + i, i);
amount9 = (iii * 23.99);
amount += amount9;
break;
}
} private static void Calamari(BufferedReader input) throws IOException
{
while(true)
{
System.out.println("How many orders of Calamari would you like? ");
int j = Integer.parseInt(input.readLine());
double jjj = Math.pow(1 + j, j);
amount10 = (jjj * 9.99);
amount += amount10;
break;
}
} private static void Clear(BufferedReader input) throws IOException
{
while(true)
{
amount = 0;
break;
}
} private static void Finish(BufferedReader input) throws IOException
{
while(true)
{
DecimalFormat x = new DecimalFormat("###.##");
System.out.println("Amount Due");
System.out.println("**********");
System.out.println("Subtotal:" + x.format(amount));
System.out.println("Total:" + x.format(amount * 1.13));
System.out.println("Please enter the amount tendered");
int k = Integer.parseInt(input.readLine());
double kk = Math.pow(1 + k, k);
amountowed = ((amount * 1.13) - kk);
if(amountowed == 0)
{
System.out.println("Thanks for paying with exact change!");
System.exit(0);
}
else if(amountowed < 0)
{
System.out.println("Change due:" + x.format(amountowed * -1.00));
System.exit(0);
}
else
{
System.out.println("Amount still owed:" + x.format(amountowed * -1.00));
}
}
}
}
结果：
Choose a Menu Option
1. Burger - 13.49
2. Pasta - 16.79
3. Salad - 13.49
4. Salmon - 18.99
5. Chicken - 16.99
6. Nachos - 13.99
7. Soup - 6.99
8. Fajitas - 18.49
9. Ribs - 23.99
10. Calamari-9.99
11. Clear Order
12. Finish Order
Choose an option(1-12) >>
Subtotal: $0
Total: $0
For error correction, choose an option and enter a negative value to void the it
em.
1
How many Burgers would you like?
1
Choose a Menu Option
1. Burger - 13.49
2. Pasta - 16.79
3. Salad - 13.49
4. Salmon - 18.99
5. Chicken - 16.99
6. Nachos - 13.99
7. Soup - 6.99
8. Fajitas - 18.49
9. Ribs - 23.99
10. Calamari-9.99
11. Clear Order
12. Finish Order
Choose an option(1-12) >>
Subtotal: $13.49
Total: $15.24
For error correction, choose an option and enter a negative value to void the it
em.
12
Amount Due
**********
Subtotal:13.49
Total:15.24
Please enter the amount tendered
100
Change due:270481382942152600000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000
为什么我为变更到期而得到古怪的数字？
答案 0 :(得分：10)
嗯......这里需要以下一行吗？
double kk = Math.pow(1 + k, k);
它完全搞砸了变化计算，因为你为用户输入（k）+ 1到k次幂提供了动力。
如果您想将其更改为双倍，(double)k即可。当然，对于货币计算，你最好使用：
Integer / Long计算答案 1 :(得分：2)
我很难理解为什么你的变更计算过于复杂......难道你不能简单地计算amount tendered - total吗？
答案 2 :(得分：1)
int e = Integer.parseInt(input.readLine());
double eee = Math.pow(1 + e, e);
假设我想要5件事。
double eee = Math.pow(1 + 5, 5)
这是6 * 6 * 6 * 6 * 6（即非常大的数字）。我想你只想要一个简单的乘法？
答案 3 :(得分：1)
如果你想要一个字符串的double，请使用Double.parseDouble而不是Integer.parseInt。不要做额外的功率计算，这会使你的结果完全错误。
更一般地说，抛出随机代码行很少是编译器错误报告的好方法。理解正在发生的事情并故意解决这个问题要好得多。
在某些时候，您可能会遇到浮点舍入错误，并且会再次建议使用BigDecimal而不是double。
答案 4 :(得分：0)
首先要做的事情......
- 你不需要不必要的while循环（在下面的代码中修复）
- Math.pow（1 + a，a）不是必需的。（在下面的代码中已修复）
- amount1，amount 2等可以声明为局部变量（未在下面的代码中修复），因为它不会造成伤害
private static void Burger(BufferedReader input) throws IOException
{
System.out.println("How many Burgers would you like? ");
int a = Integer.parseInt(input.readLine());
// double aaa = Math.pow(1 + a, a);// Why THis???
amount1 = ((double)a * 13.49);
amount += amount1;
}
private static void Pasta(BufferedReader input) throws IOException
{
System.out.println("How many orders of Pasta would you like? ");
int b = Integer.parseInt(input.readLine());
// double bbb = Math.pow(1 + b, b); You dont need this
amount2 = ((double)b * 16.79);
amount += amount2;
}
private static void Salad(BufferedReader input) throws IOException
{
System.out.println("How many Salads would you like? ");
int c = Integer.parseInt(input.readLine());
//double ccc = Math.pow(1 + c, c); No Need of this again
amount3 = ((double)c * 13.49);
amount += amount3;
}
} private static void Salmon(BufferedReader input) throws IOException
{
System.out.println("How many orders of Salmon would you like? ");
int d = Integer.parseInt(input.readLine());
//double ddd = Math.pow(1 + d, d); No Need
amount4 = ((double)d * 18.99);
amount += amount4;
}
private static void Chicken(BufferedReader input) throws IOException
{
System.out.println("How many orders of Chicken would you like? ");
int e = Integer.parseInt(input.readLine());
amount5 = ((double)e * 16.99);
amount += amount5;
}
private static void Nachos(BufferedReader input) throws IOException
{
System.out.println("How many orders of Nachos would you like? ");
int f = Integer.parseInt(input.readLine());
amount6 = ((double)f * 13.99);
amount += amount6;
}
private static void Soup(BufferedReader input) throws IOException
{
System.out.println("How many orders of Soup would you like? ");
int g = Integer.parseInt(input.readLine());
amount7 = ((double)g * 6.99);
amount += amount7;
}
private static void Fajitas(BufferedReader input) throws IOException
{
System.out.println("How many orders of 2 Fajitas would you like? ");
int h = Integer.parseInt(input.readLine());
amount8 = ((double)h * 18.49);
amount += amount8;
}
private static void Ribs(BufferedReader input) throws IOException
{
System.out.println("How many racks of Ribs would you like? ");
int i = Integer.parseInt(input.readLine());
amount9 = ((double)i * 23.99);
amount += amount9;
}
private static void Calamari(BufferedReader input) throws IOException
{
System.out.println("How many orders of Calamari would you like? ");
int j = Integer.parseInt(input.readLine());
amount10 = ((double)j * 9.99);
amount += amount10;
}
private static void Clear(BufferedReader input) throws IOException
{
amount = 0;
}
private static void Finish(BufferedReader input) throws IOException
{
amountowed =amount * 1.13
DecimalFormat x = new DecimalFormat("###.##");
while(amountowed >0)
{
System.out.println("Amount Due");
System.out.println("**********");
System.out.println("Subtotal:" + x.format(amount));
System.out.println("Total:" + x.format(amountowed));
System.out.println("Please enter the amount tendered");
double k = Double.parseDouble(input.readLine());
// double kk = Math.pow(1 + k, k); No Need
amountowed = (amountowed - k);
if(amountowed == 0)
{
System.out.println("Thanks for paying with exact change!");
System.exit(0);
}
else if(amountowed < 0)
{
System.out.println("Change due:" + x.format(amountowed * -1.00));
System.exit(0);
}
else
{
System.out.println("Amount still owed:" + x.format(amountowed));
}
}
}