error in code

amit kaushal

// i want to enter numbers in the array by taking size of array as input from user and then allowing user to enter nos. in the array//

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int n;
            int[] a = new int[n];
            Console.WriteLine("enter the size of an array");
            n = int.Parse(Console.ReadLine());
            Console.WriteLine("you can enter "+n+ " numbers in an array");
            for (int i = 0; i <= n; i++)
            {
                a[i] = Console.Read();
            }
            for (int i = 0; i <= n; i++)
            {
                Console.WriteLine(a[i]);
            }
            Console.ReadLine();
        }
    }
}

i am not able to run this code also not able to understand the errors which are as follows:-
1) use of unassigned local variable n.
2) System.IndexOutOfRangeException.
3) index was outside the bounds of the array

i want to know the meaning of each error and why they are coming.

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Jignesh Trivedi13y ago
hi,

in .net, any array index is start from 0 so, your for loop must be 1 point less than number you are entering.

for (int i = 0; i <= n; i++)
{
a[i] = Console.Read();
}

instead of this

for (int i = 0; i < n; i++)
{
a[i] = Console.Read();
}

hope this will help you.
13y ago
Try this:

using System;

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int n, i;

Console.Write("Enter size of the array ");

n = int.Parse(Console.ReadLine());

int[] a = new int[n];

Console.WriteLine("You can enter " + n + " numbers in an array");

for (i = 0; i < a.Length; i++)
a[i] = int.Parse(Console.ReadLine());

Console.Write("Array elements ");

foreach (int x in a)
Console.Write("{0} ", x);

Console.ReadKey();
}
}
}

In future please display your problem in C# Language website not in General website.
amit kaushal13y ago
after entering numbers upto the value of n, i got the following errors:

1) "System.IndexOutOfRangeException" occurred.

2) Additional Information: index was outside the bounds of the array.
Pankaj Rawat13y ago

int n;
Here u are using an unassigned integer value. // means n contain no value //

int[] a = new int[n];

Here u are using unassigned integer to declare the array size(array initialization)

for (int i = 0; i <= n; i++)

Here suppose if n=5,then the loop must run from i=0 to i=4 or i=1 to i=5. (for IndexOutOfRangeException).

static void Main(string[] args)
{
int n = 0;
Console.WriteLine("enter the size of an array");
n = int.Parse(Console.ReadLine());
int[] a = new int[n];
Console.WriteLine("you can enter " + n + " numbers in an array");
for (int i = 0; i {
a[i] = Convert.ToInt32(Console.ReadLine());
}
for (int i = 0; i< n; i++)
{
Console.WriteLine(a[i]);
}
Console.ReadLine();
}
Jignesh Trivedi13y ago
hi,
I have made some small change in your code and it working
try
int n;
int[] a;
Console.WriteLine("enter the size of an array");
n = int.Parse(Console.ReadLine());
a = new int[n];
Console.WriteLine("you can enter " + n + " numbers in an array");
for (int i = 0; i < n; i++)
{
a[i] = int.Parse(Console.ReadLine());
}
for (int i = 0; i < n; i++)
{
Console.WriteLine(a[i]);
}
Console.ReadLine();
hope this will help you.