Question

我想知道是否有办法使用Math.Round函数将值转换为0.05美分到5美分？我知道我可以通过将值乘以100来实现这一点，但我不想这样做，因为值存储在数组中并且在执行其他函数时会破坏其他计算。

例如，如果该值小于1美元，我希望打印出分值而不是小数，请参考下面的代码：

double[] coins = {0.05,0.10,0.20,0.50,1.00,2.00};

Console.WriteLine("Change is as follows:");
        for (int j = 0; j < change_given.Length; j++)
        {
            if (change_given[j] == 0)
            {
                continue;
            }
            if (coins[j] < 1)
            {
                Console.WriteLine("{0} x {1}c", change_given[j], coins[j]);
            }
            else
            {
                Console.WriteLine("{0} x ${1}", change_given[j], coins[j]);
            }
        }

Answer 1

看起来这只是出于显示目的。如果你乘以coins[j]*100，你不会更新硬币[j]：

    for (int j = 0; j < change_given.Length; j++)
    {
        if (change_given[j] == 0)            
            continue;            
        if (coins[j] < 1)
            Console.WriteLine("{0} x {1}c", change_given[j], coins[j]*100);
        else
            Console.WriteLine("{0} x ${1}", change_given[j], coins[j]);
    }

Answer 2

目标：在整数中打印美元和美分。源是一个双打数组。无需更改原始数组本身，只需读取其成员用于显示目的。

请参阅live demo。

预期输出

Change is as follows:
5 cents
10 cents
20 cents
50 cents
1 dollar
1 dollar and 42 cents
2 dollars

<强>代码

using System;

public class Test
{
    public static void Main()
    {
        double[] coins = {0.05,0.10,0.20,0.50,1.00,1.42,2.00};

        Console.WriteLine("Change is as follows:");

        for (int j = 0; j < coins.Length; j++)
        {
            var amount = coins[j];
            var dollars = Math.Floor(amount);
            var change = amount - dollars;
            var cents = 100*change;

            string ds = dollars == 1 ? String.Empty : "s";
            string cs = cents == 1 ? String.Empty : "s";

            if (amount >= 0 && amount < 1)
            {
                Console.WriteLine("{0} cents", cents);
            }
            else if (dollars >= 1 && cents == 0)
            {
                Console.WriteLine("{0} dollar{1}", dollars, ds);
            }
            else
            {
                Console.WriteLine("{0} dollar{1} and {2} cent{3}",
                    dollars, ds, cents, cs);
            }
        }
    }
}

使用Math.Round进行舍入

2 个答案: