Inserting into Array (C#)

Muhammad Adeel

I am trying to insert an int value in int array at the user input index and getting an error ( Index was outside the bounds of the array ).

Console.WriteLine("Enter the length of Linear Array");

int length = Convert.ToInt32(Console.ReadLine());

int[] LinearArr = new int[length];

Console.WriteLine("Maximum number of input : {0}",length);

for (int i = 0; i < LinearArr.Length; i++)

{

LinearArr[i] = Convert.ToInt32(Console.ReadLine());

}

Console.WriteLine("What number you want to insert and at what index");

int InsertNum = Convert.ToInt32(Console.ReadLine());

int k = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Number :{0} and Index :{1}",InsertNum,k);

while (length>=k)

{

LinearArr[length + 1] = LinearArr[length];

length = length - 1;

}

LinearArr[k] = InsertNum;

length = length + 1;

Console.ReadLine();

3 Replies

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Vulpes12y ago
Accepted answer
I imagine that you're trying to do this without using any built-in methods.

The main problem you have is that, once arrays are created, their length can't be changed. However, you can deal with this as follows:

1. Create a new array whose length is one more than the old one.

2. Copy the old array elements to the new one.

3. Assign the new array to the original array variable.

4. Set the new array variable to null.

This is, more or less, what the Arrray.Resize method does.

Try this revised code:

Console.WriteLine("Enter the length of Linear Array");
int length = Convert.ToInt32(Console.ReadLine());
int[] LinearArr = new int[length];
Console.WriteLine("Maximum number of input : {0}",length);
for (int i = 0; i < LinearArr.Length; i++)
{
LinearArr[i] = Convert.ToInt32(Console.ReadLine());
}
Console.WriteLine("What number you want to insert and at what index");
int InsertNum = Convert.ToInt32(Console.ReadLine());
int k = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Number :{0} and Index :{1}",InsertNum,k);
if (k < 0 || k > length)
{
Console.WriteLine("Index is outside the array bounds");
return;
}
int[] LinearArr2 = new int[length + 1];
for(int i = 0; i < length; i++)
{
LinearArr2[i] = LinearArr[i];
}
LinearArr = LinearArr2;
LinearArr2 = null;
while (length > k)
{
LinearArr[length] = LinearArr[length-1];
length = length - 1;
}
LinearArr[k] = InsertNum;
length = LinearArr.Length;
Console.WriteLine("Array now contains");
foreach(int i in LinearArr) Console.WriteLine(i);
Console.WriteLine("New length is : " + length);
Console.ReadLine();
+1
Anoop Kumar Sharma12y ago
You get this error("Index was outside the bounds of the array") because you are trying to store value in Array more than its Capacity.

In Above Code, you declared int[] LinearArr = new int[length];

and the trying to store value more than its storing capacity
see this in you code LinearArr[length + 1] = LinearArr[length];

That's why you get IndexOutOfRangeException with message Index was outside the bounds of the array.

Hope this will help you.
0
Wim Sturkenboom12y ago
Let's say that length is 20, so your array has 20 locations (numbered from 0 to 19). In your while-loop, you're trying to access locations 21 (length +1) and 20 (length).

So no surprises ;)
0