How to assign a value from a "for loop" to an array

Question

I'm trying to figure out how to assign values to an array while a for loop is happening. I've tried displaying one of the elements in the array but it always ends up with 0

using System;

namespace Assignment4
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] numArray = new int[48]; // 48 elements
            int total = 1;   // trying to get odd numbers to fill for the elements         
            int index;
            for (index = 0; index <= numArray.Length; index++) // for loop to assign array
            {
                total = total + 2;
                Console.WriteLine("#{0} current number is {1} ", index + 1, total); // double checking the index thing
            }
            Console.WriteLine(numArray[34]); // checking if the specified array will display the number in the list
        }
    }
}

You are not assigning values to the array elements in the for loop. — Chetan, Feb 11 '21 at 07:34
The value is 0, because that's the default value for an `int[]` element, and you haven't bothered to change the value of any element. See duplicate. — Peter Duniho, Feb 11 '21 at 08:10

score 2 · Accepted Answer · answered Feb 11 '21 at 07:36

index < numArray.Length // 1st change else it will throw an exception at numArray[48] = total if it was <=

numArray[index] = total // 2nd change Assign it to the array

int[] numArray = new int[48]; // 48 elements
int total = 1; // trying to get odd numbers to fill for the elements         
int index;

// Changed <= to <
for (index = 0; index < numArray.Length; index++) // for loop to assign array

{
    total = total + 2;
    numArray[index] = total; // This is where you assign the values.
    Console.WriteLine("#{0} current number is {1} ", index + 1, total); // double checking the index thing
}

Console.WriteLine(numArray[34]); // checking if the specified array will display the number in the list

score 1 · Answer 2 · answered Feb 11 '21 at 07:39

1

the way to go is using the assign operator:

numArray[i] = y;

this asigns the value y to the cell i of the array numArray

answered Feb 11 '21 at 07:39

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score 0 · Answer 3 · answered Feb 11 '21 at 07:52

You are missing assignment to an array. Let's see the below code. Here we are looping inside for for finding odd numbers from 0 to 100, and if found, storing in declared array, index wise.

using System;

namespace Assignment4
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int upperLimit=100;//adding this to loop upto
            int[] numArray = new int[48]; // 48 elements
            int total = 1;   // trying to get odd numbers to fill for the elements         
            int index,i=0;
            for(index = 0; index <= upperLimit; index++) // for loop to assign array, we will go upto 100 numbers
            {
                total = total + 2;
                Console.WriteLine("#{0} current number is {1} ", index+1, index+1); // double checking the index thing
                if(index%2==1){//checking if that one is an odd number
                    Console.WriteLine("{0} is odd number",index);
                    numArray[i]=index;
                    i++;
                }
            }
            Console.WriteLine(numArray[34]); // checking if the specified array will display the number in the list
        }
    }
}

How to assign a value from a "for loop" to an array

3 Answers3