如何将元素插入数组 C#

Question

I'm new to programming and for one of my college classes I have to use C#. I'm not super familiar with C# and I am having trouble with my assignment. And unfortunatly I've spent a little over an hour trying to find solutions. And my search has come up empty. No one I know understands or can code anything. Plz Help

Under the Main method, create an array named as n of 10 integers.

Create a for loop to assign the value to the n array from 100 to 109.

Create a foreach loop to output each array element's value.

     static void Main(string[] args)
     {
         int[] n = new int[10];

         for (int i= 0; i < 10; i++)
         {
                 n[i] = 100 + i;
         }

         foreach (int i in n)
         {
             Console.WriteLine(int[i]);
         }
     }

Answer 1

This line:

Console.WriteLine(int[i]);

Must be replaced with this:

Console.WriteLine(i);

Answer 2

Your code is almost perfect for the assignment

static void Main(string[] args)
{
    // create an array named as n of 10 integers
    int[] n = new int[10];

    // create a for loop to assign the value to the n array from 100 to 109.
    for (int i= 0; i < 10; i++)
    {
        n[i] = 100 + i;
    }
    // create a foreach loop to output each array element's value.
    foreach (int item in n)
    {
        Console.WriteLine(item);
    }
}

as you can see, in your code i is an integer from the array element, and not the array index. So your int[i] is incorrect syntax.

Answer 3

I implemented a few alternatives as well as a solution to your immediate challenge. In int[i] you wrote down the data type int instead of the name of the array, which is n . when i is a valid index n[i] gives you the value. in a foreach construct you give the value a name to be used in each iteration. confusingly you named it i as well, so i gives you the value. i is common in for loops as the index so this may be confused with that idiom and you would be better off using a more speaking name like number in your code.

using System;
using System.Linq;
class Program
{
    static void Main(string[] args)
    {
        Implementation1();
        Console.WriteLine();
        Implementation2();
        Console.WriteLine();
        Implementation3();
    }
    static void Implementation1()
    {
        int[] n = new int[10];
        for (int i = 0; i < n.Length; ++i)
            n[i] = 100 + i;
        for (int i = 0; i < n.Length; ++i)
            Console.WriteLine(n[i]);
    }
    static void Implementation2()
    {
        int[] n = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        for (int i = 0; i < n.Length; ++i)
            n[i] = 100 + i;
        foreach (var number in n)
            Console.WriteLine(number);
    }
    static void Implementation3()
    {
        var n = Enumerable.Range(100, 10).ToArray();
        string.Join(',', n.Select(val => $"{val}"));
        Console.WriteLine(string.Join(',', n.Select(val => $"{val}")));
    }
}