The code that follows uses a for loop to sum the elements in an array. Find the error(s) in the following code:
int SumArray()
{
int intSum = 0;
int[] intNumbers = { 1, 2, 3, 4, 5, 6, 7, 8 };
for ( int intCounter = 0; intCounter <= intNumbers.Length;
intCounter++ )
{
intSum += intNumbers[ intCounter ];
}
return intSum;
} // end method SumArray
Array intNumbers does have intNumbers.Length number of elements, but the
indices are zero through intNumbers.Length – 1. The for loop increments intCounter beyond the highest index in the array which results in a run-time error. To correct the error, change the loop-continuation condition to use < rather than <=. The complete incorrect code reads:
// SumArray.cs (Incorrect)
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace SumArray
{
///
/// Summary description for FrmSumArray.
///
public class FrmSumArray : System.Windows.Forms.Form
{
private System.Windows.Forms.Label lblSumOutput;
private System.Windows.Forms.Label lblSum;
private System.Windows.Forms.Label lblArrayContents;
private System.Windows.Forms.Label lblArray;
///
/// Required designer variable.
///
private System.ComponentModel.Container components = null;
public FrmSumArray()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent
// call
//
}
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
// Windows Form Designer generated code
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run( new FrmSumArray() );
}
// prints the result of the SumArray method
private void FrmSumArray_Load(
object sender, System.EventArgs e )
{
lblSumOutput.Text = Convert.ToString( SumArray() );
} // end method FrmSumArray_Load
// returns the sum of all of an array's elements
int SumArray()
{
int intSum = 0;
int[] intNumbers = { 1, 2, 3, 4, 5, 6, 7, 8 };
for ( int intCounter = 0; ;
intCounter++ )
{
intSum += intNumbers[ intCounter ];
}
return intSum;
} // end method SumArray
} // end class FrmSumArray
}
The complete corrected code should read:
// SumArray.cs (Correct)
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace SumArray
{
///
/// Summary description for FrmSumArray.
///
public class FrmSumArray : System.Windows.Forms.Form
{
private System.Windows.Forms.Label lblSumOutput;
private System.Windows.Forms.Label lblSum;
private System.Windows.Forms.Label lblArrayContents;
private System.Windows.Forms.Label lblArray;
///
/// Required designer variable.
///
private System.ComponentModel.Container components = null;
public FrmSumArray()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent
// call
//
}
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
// Windows Form Designer generated code
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run( new FrmSumArray() );
}
// prints the result of the SumArray method
private void FrmSumArray_Load(
object sender, System.EventArgs e )
{
lblSumOutput.Text = Convert.ToString( SumArray() );
} // end method FrmSumArray_Load
// returns the sum of all of an array's elements
int SumArray()
{
int intSum = 0;
int[] intNumbers = { 1, 2, 3, 4, 5, 6, 7, 8 } ;
for ( int intCounter = 0; intCounter < intNumbers.Length;
intCounter++ )
{
intSum += intNumbers[ intCounter ];
}
return intSum;
} // end method SumArray
} // end class FrmSumArray
}
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