It seems that you have only 1 problem - In the Indexer, the "ok"
function is called on the index, and this function is declared below
the property itself : "private bool ok(int index)".
On Oct 17, 12:28 pm, "VIKAS GARG" <[EMAIL PROTECTED]> wrote:
> The prog is too complicated to understand. Please can anyone give me any
> link to easier oneI am trying to learn hoe to create self defined exception
> handling programs.
>
> using System;
>
> // Create a RangeArray exception.
> class RangeArrayException : ApplicationException
> {
> // Implement the standard constructors
> public RangeArrayException() : base() { }
> public RangeArrayException(string str) : base(str) { }
>
> // Override ToString for RangeArrayException.
> public override string ToString()
> {
> return Message;
>
> }
> }
>
> // An improved version of RangeArray.
> class RangeArray
> {
> // private data
> int[] a; // reference to underlying array
> int lowerBound; // lowest index
> int upperBound; // greatest index
>
> int len; // underlying var for Length property
>
> // Construct array given its size.
> public RangeArray(int low, int high)
> {
> high++;
> if (high <= low)
> {
> throw new RangeArrayException("Low index not less than high.");}
>
> a = new int[high - low];
> len = high - low;
>
> lowerBound = low;
> upperBound = --high;
>
> }
>
> // Read-only Length property.
> public int Length
> {
> get
> {
> return len;
>
> }
> }
>
> // This is the indexer for RangeArray.
> public int this[int index] // <Unable
> to understand this property>
> {
> // This is the get accessor.
> get
> {
> if (ok(index)) //<We
> have not declared OK then how wil compiler understand this keyword>
> {
> return a[index - lowerBound];}
>
> else
> {
> throw new RangeArrayException("Range Error.");}
> }
>
> // This is the set accessor.
> set
> {
> if (ok(index))
> {
> a[index - lowerBound] = value;}
>
> else throw new RangeArrayException("Range Error.");}
> }
>
> // Return true if index is within bounds.
> private bool ok(int index)
> {
> if (index >= lowerBound & index <= upperBound) return true;
> return false;
>
> }
> }
>
> // Demonstrate the index-range array.
> class RangeArrayDemo
> {
> public static void Main()
> {
> try
> {
> RangeArray ra = new RangeArray(-5, 5);
> RangeArray ra2 = new RangeArray(1, 10);
>
> // Demonstrate ra
> Console.WriteLine("Length of ra: " + ra.Length);
>
> for (int i = -5; i <= 5; i++)
> ra* = i;
>
> Console.Write("Contents of ra: ");
> for (int i = -5; i <= 5; i++)
> Console.Write(ra + " ");
>
> Console.WriteLine("\n");
>
> // Demonstrate ra2
> Console.WriteLine("Length of ra2: " + ra2.Length);
>
> for (int i = 1; i <= 10; i++)
> ra2 = i;
>
> Console.Write("Contents of ra2: ");
> for (int i = 1; i <= 10; i++)
> Console.Write(ra2 + " ");
>
> Console.WriteLine("\n");
>
> }
>
> catch (RangeArrayException exc)
> {
> Console.WriteLine(exc);
>
> }
>
> // Now, demonstrate some errors.
> Console.WriteLine("Now generate some range errors.");
>
> // Use an invalid constructor.
> try
> {
> RangeArray ra3 = new RangeArray(100, -10); // Error
>
> }
>
> catch (RangeArrayException exc)
> {
> Console.WriteLine(exc);}*
>
> // Use an invalid index.
> try
> {
> RangeArray ra3 = new RangeArray(-2, 2);
>
> for (int i = -2; i <= 2; i++)
> ra3* = i;
> Console.Write("Contents of ra3: ");
> for (int i = -2; i <= 10; i++) // generate range error
> Console.Write(ra3 + " ");
>
> }
>
> catch (RangeArrayException exc)
> {
> Console.WriteLine(exc);
>
> }
> Console.ReadKey();
> }
> }*
>
> If anyone try to compile this proggplease remove these lines from the progg
> if you are trying to compile it
>
> <We have not declared OK then how wil compiler understand this keyword>
>
> and
>
> <Unable to understand this property>
>
> these are two problems which I was unable to understand
> please if possible for anyone write comment on this probs also
> I'll be thankful to you
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