对于循环抛出超出范围异常
本文关键字：范围 异常 于循环 循环 | 更新日期: 2023-09-27 18:32:29
错误是
索引超出范围异常
并且位于 for 循环的第一行：
for (i = (int)start, j = 0; i <= (int)end; i++, j++)
{ // Since linear relationships...
idealWeights[0, j] = (female += 3.5); **ERROR HERE ON THIS LINE**
idealWeights[1, j] = (male += 4.0);
}
txtStart 和 txtEnd 中的值为：txtStart = 36txtEnd = 96
这是代码：
using System;
using System.Windows.Forms;
public class frmMain : Form
{
private TextBox txtStart;
private TextBox txtEnd;
private ListBox lstResults;
private Button btnClose;
private Label label1;
private Label label2;
private Button btnCalc;
private void InitializeComponent()
{
this.btnCalc = new System.Windows.Forms.Button();
this.txtStart = new System.Windows.Forms.TextBox();
this.txtEnd = new System.Windows.Forms.TextBox();
this.lstResults = new System.Windows.Forms.ListBox();
this.btnClose = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// btnCalc
//
this.btnCalc.Location = new System.Drawing.Point(26, 197);
this.btnCalc.Name = "btnCalc";
this.btnCalc.Size = new System.Drawing.Size(75, 23);
this.btnCalc.TabIndex = 0;
this.btnCalc.Text = "Ca&lculate";
this.btnCalc.UseVisualStyleBackColor = true;
this.btnCalc.Click += new System.EventHandler(this.btnCalc_Click);
//
// txtStart
//
this.txtStart.Location = new System.Drawing.Point(172, 12);
this.txtStart.Name = "txtStart";
this.txtStart.Size = new System.Drawing.Size(100, 20);
this.txtStart.TabIndex = 1;
//
// txtEnd
//
this.txtEnd.Location = new System.Drawing.Point(172, 38);
this.txtEnd.Name = "txtEnd";
this.txtEnd.Size = new System.Drawing.Size(100, 20);
this.txtEnd.TabIndex = 2;
//
// lstResults
//
this.lstResults.FormattingEnabled = true;
this.lstResults.Location = new System.Drawing.Point(26, 96);
this.lstResults.Name = "lstResults";
this.lstResults.Size = new System.Drawing.Size(246, 95);
this.lstResults.TabIndex = 3;
//
// btnClose
//
this.btnClose.Location = new System.Drawing.Point(197, 197);
this.btnClose.Name = "btnClose";
this.btnClose.Size = new System.Drawing.Size(75, 23);
this.btnClose.TabIndex = 4;
this.btnClose.Text = "&Close";
this.btnClose.UseVisualStyleBackColor = true;
//
// label1
//
this.label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label1.Location = new System.Drawing.Point(23, 12);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(143, 20);
this.label1.TabIndex = 5;
this.label1.Text = "Start:";
this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// label2
//
this.label2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label2.Location = new System.Drawing.Point(23, 38);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(143, 20);
this.label2.TabIndex = 6;
this.label2.Text = "End:";
this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// frmMain
//
this.ClientSize = new System.Drawing.Size(284, 262);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Controls.Add(this.btnClose);
this.Controls.Add(this.lstResults);
this.Controls.Add(this.txtEnd);
this.Controls.Add(this.txtStart);
this.Controls.Add(this.btnCalc);
this.Name = "frmMain";
this.ResumeLayout(false);
this.PerformLayout();
}
public frmMain()
{
InitializeComponent();
}
public static void Main()
{
frmMain main = new frmMain();
Application.Run(main);
}
const double MININCHES = 36;
const double MAXINCHES = 96;
private void btnCalc_Click(object sender, EventArgs e)
{
bool flag;
int i;
int j;
double start;
double end;
double male;
double female;
double[,] idealWeights;
string buff;
//============================== Input ===============================================
flag = double.TryParse(txtStart.Text, out start); // Table start
if (flag == false)
{
MessageBox.Show("Numeric only.");
txtStart.Focus();
return;
}
flag = double.TryParse(txtEnd.Text, out end); // Table end
if (flag == false)
{
MessageBox.Show("Numeric only.");
txtEnd.Focus();
return;
}
//============================= Validate input ==============================================
if (start < MININCHES || start > MAXINCHES) // Check table limits
{
MessageBox.Show("Table can only span " + MININCHES.ToString() + " to " +
MAXINCHES + " inches.");
txtStart.Focus();
return;
}
if (end < MININCHES || end > MAXINCHES)
{
MessageBox.Show("Table can only span " + MININCHES.ToString() +
" to " + MAXINCHES + " inches.");
txtEnd.Focus();
return;
}
if (end <= start) // Can we display anything
{
MessageBox.Show("Starting value must be less than ending value");
txtStart.Focus();
return;
}
// Define the array for table data
idealWeights = new double[2, (int)(end - start) + 1];
//=============================== Process ====================================================
start--; // This is the new line
female = 3.5 * start - 108; // Set initial table values
male = 4.0 * start - 128;
for (i = (int)start, j = 0; i <= (int)end; i++, j++)
{ // Since linear relationships...
idealWeights[0, j] = (female += 3.5);
idealWeights[1, j] = (male += 4.0);
}
//================================ Display step ==============================================
for (i = (int)start, j = 0; i <= (int)end; i++, j++)
{
buff = String.Format("{0,5}{1,15}{2,15}", i, idealWeights[0, j], idealWeights[1, j]);
lstResults.Items.Add(buff);
}
}
}
我对编程很陌生，所以我在这里有点迷茫，这段代码来自一本书，书中还没有出现任何错误。所以希望错误不是很复杂，因为我仍然只是输入大量代码并阅读代码以尝试理解它。
你没有对j变量进行绑定检查。它显然超过了第二个数组元素的大小。 正如Servy在我们的评论中指出的那样，这是一个常见的错误。我已经调整了代码以从 <= 中删除 =。
for 行需要看起来像这样...
for (i = (int)start, j = 0; i < (int)end; i++, j++)