Java 自动售货机
我对Java非常陌生。我有个错误。我知道是什么原因导致了双精度(changeLeft),但我需要得到双精度的结果,以便显示正确的变化,但我不知道如何做到这一点 我不允许使用便士。最小的变化是四分之一 我相信我要做的就是投球?但我真的很迷茫 如有任何帮助/建议,将不胜感激Java 自动售货机,java,casting,Java,Casting,我对Java非常陌生。我有个错误。我知道是什么原因导致了双精度(changeLeft),但我需要得到双精度的结果,以便显示正确的变化,但我不知道如何做到这一点 我不允许使用便士。最小的变化是四分之一 我相信我要做的就是投球?但我真的很迷茫 如有任何帮助/建议,将不胜感激 import java.util.Scanner; public class Cash { public static void main(String[] args) { Scanner scan
import java.util.Scanner;
public class Cash {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int itemCost = 0;
int moneyInserted = 0;
int changeLeft = 0;
int hundred = 0;
int fifty = 0;
int twenty = 0;
int ten = 0;
int five = 0;
int toonie = 0;
int loonie = 0;
double quarter = 0;
System.out.println("Item cost?");
itemCost = scanner.nextInt();
System.out.println("Amount given?");
moneyInserted = scanner.nextInt();
changeLeft = moneyInserted - itemCost;
hundred = changeLeft / 100;
changeLeft = changeLeft % 100;
fifty = changeLeft / 50;
changeLeft = changeLeft % 50;
twenty = changeLeft / 20;
changeLeft = changeLeft % 20;
ten = changeLeft / 10;
changeLeft = changeLeft % 10;
five = changeLeft / 5;
changeLeft = changeLeft % 5;
toonie = changeLeft / 2;
changeLeft = changeLeft % 2;
loonie = changeLeft / 1;
changeLeft = changeLeft % 1;
quarter = (double)changeLeft;
System.out.println("Change Due($): \n" +
hundred + " Hundred\n" + fifty + " Fifty\n" + twenty +
" Twenty\n" + ten + " Ten\n" + five + " Five\n" + toonie +
" Toonie\n" + loonie + " Loonie\n" +
quarter + " Quarter");
}
}
您可以将所有内容更新为双倍。注意来自扫描仪的Double.valueOf(字符串)
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double itemCost = 0;
double moneyInserted = 0;
double changeLeft = 0;
double hundred = 0;
double fifty = 0;
double twenty = 0;
double ten = 0;
double five = 0;
double toonie = 0;
double loonie = 0;
double quarter = 0;
System.out.println("Item cost?");
itemCost = Double.valueOf(scanner.next());
System.out.println("Amount given?");
moneyInserted = Double.valueOf(scanner.next());
changeLeft = moneyInserted - itemCost;
hundred = changeLeft / 100;
changeLeft = changeLeft % 100;
fifty = changeLeft / 50;
changeLeft = changeLeft % 50;
twenty = changeLeft / 20;
changeLeft = changeLeft % 20;
ten = changeLeft / 10;
changeLeft = changeLeft % 10;
five = changeLeft / 5;
changeLeft = changeLeft % 5;
toonie = changeLeft / 2;
changeLeft = changeLeft % 2;
loonie = changeLeft / 1;
changeLeft = changeLeft % 1;
quarter = (double)changeLeft;
System.out.println("Change Due($): \n" +
hundred + " Hundred\n" + fifty + " Fifty\n" + twenty +
" Twenty\n" + ten + " Ten\n" + five + " Five\n" + toonie +
" Toonie\n" + loonie + " Loonie\n" +
quarter + " Quarter");
}
您可以将所有内容更新为双倍。注意来自扫描仪的Double.valueOf(字符串)
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double itemCost = 0;
double moneyInserted = 0;
double changeLeft = 0;
double hundred = 0;
double fifty = 0;
double twenty = 0;
double ten = 0;
double five = 0;
double toonie = 0;
double loonie = 0;
double quarter = 0;
System.out.println("Item cost?");
itemCost = Double.valueOf(scanner.next());
System.out.println("Amount given?");
moneyInserted = Double.valueOf(scanner.next());
changeLeft = moneyInserted - itemCost;
hundred = changeLeft / 100;
changeLeft = changeLeft % 100;
fifty = changeLeft / 50;
changeLeft = changeLeft % 50;
twenty = changeLeft / 20;
changeLeft = changeLeft % 20;
ten = changeLeft / 10;
changeLeft = changeLeft % 10;
five = changeLeft / 5;
changeLeft = changeLeft % 5;
toonie = changeLeft / 2;
changeLeft = changeLeft % 2;
loonie = changeLeft / 1;
changeLeft = changeLeft % 1;
quarter = (double)changeLeft;
System.out.println("Change Due($): \n" +
hundred + " Hundred\n" + fifty + " Fifty\n" + twenty +
" Twenty\n" + ten + " Ten\n" + five + " Five\n" + toonie +
" Toonie\n" + loonie + " Loonie\n" +
quarter + " Quarter");
}
什么是
x/1
?x/1
的其余部分是什么?(提示:数学)。如果你在用钱工作,那么它应该是双倍的。如果你从那个双精度中得到计数,那么它们可以是整数。NB整数除法与双精度或浮点除法有很大不同。如果您使用的是货币,您可以接受双精度作为用户输入,但双精度必须立即转换为整数或长精度。浮点运算对于货币计算来说不够精确。什么是x/1
?x/1
的其余部分是什么?(提示:数学)。如果你在用钱工作,那么它应该是双倍的。如果你从那个双精度中得到计数,那么它们可以是整数。NB整数除法与双精度或浮点除法有很大不同。如果您使用的是货币,您可以接受双精度作为用户输入,但双精度必须立即转换为整数或长精度。浮点运算对于货币计算来说不够精确。