Question

trying to iterate with this for loop and input int from user into array. I am getting an error and don’t understand why..

error: Error 1 Use of unassigned local variable ‘array’

using System;

namespace Lab16
{
class Program
{
    static void Main(string[] args)
    {
        int[] array;
        int value;

        Console.Write("How big of an Array? ");
        int arraySize = int.Parse(Console.ReadLine());

        for (int i = 0; i <= arraySize; i++)
        {
            Console.Write("First Value: ");
            value = int.Parse(Console.ReadLine());
       -->  array[i] = Convert.ToInt32(value);

        }
    }
}
}

Answer 1

Your array variable isn’t initialized. Writing this should fix it:

int[] array = new int[arraySize];

(Note, of course this needs to go after you’ve read arraySize from the console…)

int value;
Console.Write("How big of an Array? ");
int arraySize = int.Parse(Console.ReadLine());
int[] array = new int[arraySize];

And one more problem … your for loop as written is going to go out of bounds. Should be like this:

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