如何修改代码以将总计存储到decArray中
本文关键字:存储 decArray 何修改 修改 代码 | 更新日期: 2023-09-27 17:58:21
我很沮丧。我是一个做作业的新手,我似乎不明白为什么我的消息框只显示了五次相同的数字(最后一次计算的小计数字)。我不知道如何在不重置的情况下使用for循环将我的值存储到数组中。有人能帮忙吗?提前谢谢。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace InvoiceTotal
{
public partial class frmInvoiceTotal : Form
{
public frmInvoiceTotal()
{
InitializeComponent();
}
// TODO: declare class variables for array and list here
decimal[] decArray = new decimal[5];
int intIndex = 0;
private void btnCalculate_Click(object sender, EventArgs e)
{
try
{
if (txtSubtotal.Text == "")
{
MessageBox.Show(
"Subtotal is a required field.", "Entry Error");
}
else
{
decimal subtotal = Decimal.Parse(txtSubtotal.Text);
if (subtotal > 0 && subtotal < 10000)
{
decimal discountPercent = 0m;
if (subtotal >= 500)
discountPercent = .2m;
else if (subtotal >= 250 & subtotal < 500)
discountPercent = .15m;
else if (subtotal >= 100 & subtotal < 250)
discountPercent = .1m;
decimal discountAmount = subtotal * discountPercent;
decimal invoiceTotal = subtotal - discountAmount;
discountAmount = Math.Round(discountAmount, 2);
invoiceTotal = Math.Round(invoiceTotal, 2);
txtDiscountPercent.Text = discountPercent.ToString("p1");
txtDiscountAmount.Text = discountAmount.ToString();
txtTotal.Text = invoiceTotal.ToString();
for (intIndex = 0; intIndex <= decArray.Length - 1; intIndex++)
{
decArray[intIndex] = invoiceTotal;
}
}
else
{
MessageBox.Show(
"Subtotal must be greater than 0 and less than 10,000.",
"Entry Error");
}
}
}
catch (FormatException)
{
MessageBox.Show(
"Please enter a valid number for the Subtotal field.",
"Entry Error");
}
txtSubtotal.Focus();
}
private void btnExit_Click(object sender, EventArgs e)
{
// TODO: add code that displays dialog boxes here
string totalstring = "";
foreach (decimal value in decArray)
{
totalstring += value + "'n";
}
MessageBox.Show(totalstring + "'n", "Order Totals");
this.Close();
}
}}
由于这是一个家庭作业,我只能给你一个线索,你的循环目前只占用一个invoiceTotal
,你根本不必使用循环,当你的控件进入btnCalculate_Click
事件时,在计算完invoiceTotal
后,你可以使用你的类级别intIndex
将其放入decArray
。递增intIndex
,在decArray
中输入值之前,必须检查intIndex
是否小于array length
。另一个想法是,如果您期望未知数量的输入,则使用List<decimal>
而不是数组。
您的for...loop
将数组的每个索引设置为总和。
for (intIndex = 0; intIndex <= decArray.Length - 1; intIndex++)
{
decArray[intIndex] = invoiceTotal;
}
问问自己:它的目的是什么?你可以安全地将其更改为:
decArray[intIndex++] = invoiceTotal;
我将由你来决定如何改变它(因为这是家庭作业)。