我有以下代码(我不太懂计算机,所以要温柔),用户应该能够输入单独的硬币数量,程序将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 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百位中不是“0”,我就可以了。但如果我输入两个季度,我会得到“$0.5”而不是“$0.50”。
最佳答案
您可以使用 DecimalFormat
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.");
关于java - 用小数点计算变化(可能是简单的解决方案),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28307781/