[英]How do I fix my double to integer error code when trying to figure out total price? [duplicate]
到目前为止,我是一个初学者,在上完 5 节课后有点不知所措。 我收到以下行的“无法从双精度转换为整数”错误消息:“priceDozen = totalDozen * PRICEPERDOZEN;” & "priceLoose = totalLoose * PRICEPERLOOSE;" 我不知道我需要做什么来解决这个问题。 我是否以某种方式转换? 感谢您的任何建议!
package edu.mtc.egr281.chapter02;
导入 javax.swing.JOptionPane;
公共 class Project03 {
// Constants
public static final int DOZEN = 12;
public static final double PRICEPERDOZEN = 4.05;
public static final double PRICEPERLOOSE = 0.35;
public static void main(String[] args) {
// PREPARE - Store Data
int amount, priceDozen, priceLoose, totalDozen, totalLoose, totalPrice, totalEggs;
// INPUT Data
// Enter amount of eggs to purchase
String amountString = JOptionPane.showInputDialog(
"Welcome to Meadowdale Dairy Farm!" +
" How many eggs would you like to purchase?");
// Convert from String data type to the int data type
amount = Integer.parseInt(amountString);
// PROCESS Data
// Determine the number of dozens, loose, dozen price, and loose price
// Store off the original starting amount
totalEggs = amount;
// Determine the total number of dozen
totalDozen = amount / DOZEN;
// Calculate the amount remaining after the dozen
amount = amount % totalDozen;
// Determine the total number of loose
totalLoose = amount;
// Determine the total Dozen price
priceDozen = totalDozen * PRICEPERDOZEN;
// Determine the total Loose price
priceLoose = totalLoose * PRICEPERLOOSE;
// Determine the total price
totalPrice = priceDozen + priceLoose;
// OUTPUT Data
// Output the number of dozen and loose eggs
JOptionPane.showMessageDialog(null,
"You ordered " + totalEggs + " eggs." +
"That's " + totalDozen + " dozen eggs at $4.05 per dozen and " +
totalLoose + " loose eggs at $0.35 each for a total of " + totalPrice);
// Exit GUI program
System.exit(0);
}// Ending bracket of method main
}// class Project03Eggs的结束支架
您可以简单地将变量priceDozen
声明为double
而不是int
double priceDozen;
您将获得带小数的精确结果
如果priceDozen
不需要小数,您可以将计算转换为 int:
priceDozen = (int) (totalDozen * PRICEPERDOZEN);
您将得到一个不带小数的数字
(其他两个变量priceLoose
和totalPrice
)
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