error in code

Question

// 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.

Jignesh Trivedi · Answer

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 { a[i] = Console.Read(); } instead of this for (int i = 0; i { a[i] = Console.Read(); } hope this will help you.

Maha · Answer

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[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 kaushal · Answer

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 Rawat · Answer

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 Here suppose if n=5then 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 { Console.WriteLine(a[i]); } Console.ReadLine(); }

Jignesh Trivedi · Answer

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 { a[i] = int.Parse(Console.ReadLine()); } for (int i = 0; i { Console.WriteLine(a[i]); } Console.ReadLine(); hope this will help you.