Java 用小数点计算变化(可能是简单的解决方案)
我有以下代码(我不是很懂电脑,所以要温柔),用户应该能够输入个人硬币数量,程序会告诉用户他们在所述硬币数量中有多少钱Java 用小数点计算变化(可能是简单的解决方案),java,number-formatting,Java,Number Formatting,我有以下代码(我不是很懂电脑,所以要温柔),用户应该能够输入个人硬币数量,程序会告诉用户他们在所述硬币数量中有多少钱 import java.util.*; public class Coins { public static final Scanner CONSOLE = new Scanner(System.in); public static void main(String[] args) { System.out.println ("Lab 2 by Maria
import java.util.*;
public class Coins {
public static final Scanner CONSOLE = new Scanner(System.in);
public static void main(String[] args) {
System.out.println ("Lab 2 by Maria T Williams\n");
quarterAmount( );
dimeAmount( );
nickelAmount( );
pennyAmount( );
}
public static void quarterAmount( ) {
System.out.print("Enter the number of quarters: ");
int quarterNumber = CONSOLE.nextInt( );
double amount = quarterNumber * 0.25;
System.out.print(quarterNumber + " You have $" + amount);
System.out.println(" worth of quarters.");
}
public static void dimeAmount( ) {
System.out.print("Enter the number of dimes: ");
int dimeNumber = CONSOLE.nextInt( );
double amount = dimeNumber * .10;
System.out.print(dimeNumber + " You have $" + amount);
System.out.println(" worth of dimes.");
}
public static void nickelAmount( ) {
System.out.print("Enter the number of nickels: ");
int nickelNumber = CONSOLE.nextInt( );
double amount = nickelNumber * 0.05;
System.out.print(nickelNumber + " You have $" + amount);
System.out.println(" worth of nickels.");
}
public static void pennyAmount( ) {
System.out.print("Enter the number of pennies: ");
int pennyNumber = CONSOLE.nextInt( );
double amount = pennyNumber * 0.01;
System.out.print(pennyNumber + " You have $" + amount);
System.out.println(" worth of pennies.");
}
}
如果我输入的金额在100位的数字不是“0”,我就可以了。但是如果我输入,比如说,两个季度,我得到的是“$0.5”而不是“$0.50”。您可以使用a强制将数字格式化为您想要的格式。例如:
DecimalFormat df = new DecimalFormat("#.00");
double amount = dimeNumber * .10;
System.out.print(dimeNumber + " You have $" + df.format(amount) + " worth of dimes.");
输出计算结果时,您可以使用如下
DecimalFormat
:
DecimalFormat f = new DecimalFormat("#0.00");
System.out.println(f.format(dimeNumber));
将内部总和保留为美分,然后将最终总和转换回#.#.##?使用
System.out.printf(…)
not out.println。对浮点数使用格式化程序,如%0.2f。或者使用NumberFormat getCurrencyInstance。无论我在何处尝试添加该代码,都会得到以下信息:文件:C:\Users\Theria\Downloads\Coins.java[line:29]错误:DecimalFormat无法解析为type@Maria由于DecimalFormat
不在java.lang
包中,因此您应该完全限定它(即,在类声明之前使用java.text.DecimalFormat
)或添加导入语句(import java.text.DecimalFormat;
)。文件:C:\Users\Theria\Downloads\Coins.java[行:29]错误:DecimalFormat无法解析为类型我可能将代码放错了位置?同样,非常不懂计算机的人尝试添加导入:import java.text.DecimalFormat;