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How to limit console input [closed]

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I am trying to check user input which supposes to be a four-digit account number only. if the user enters more or less input. it would say "invalid entry". I am not sure how to check var length in c#.
Console.WriteLine("Enter a four-digit account number");
int acc = Convert.ToInt32(Console.ReadLine());
int d = acc % 10;
acc = acc / 10;
if (acc % 7 == d)
Console.WriteLine("Valid Account Number");
else
Console.WriteLine("Invalid Account Number");

Updated
var inputText = Console.ReadLine();
var inputNumber = 0;
// try to parse - if success, then parsingFlag = True
// and parsed number is stored to inputNumber
var parsingFlag = Int32.TryParse(inputText, out inputNumber);
if ((inputNumber >= 1000) && (inputNumber <= 9999))
{
// do your algorithm
}
else
Console.WriteLine("Invalid entry");

how to separate per 8 digit from string in c#? [closed]

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string txte = save.ToString();
for (int i = 7; i < save.Length; i= i+8)
{
outs.Append(txte.Substring(i-7,i)+ " ");
}

Given
public static class Extension
{
public static IEnumerable<string> Chunks(this string input, int size)
// select with index
=> input?.Select((x, i) => i)
// filter by chunk
.Where(i => i % size == 0)
// substring out the chunk, or part thereof
.Select(i => input.Substring(i, Math.Min(size,input.Length - i)));
}
Usage
var s = "11111111222222223333333344444444";
foreach (var result in s.Chunks(8))
Console.WriteLine(result);
Console.WriteLine("---");
// or add space
Console.WriteLine(string.Join(" ", s.Chunks(8)));
Results
11111111
22222222
33333333
44444444
---
11111111 22222222 33333333 44444444

As long as you are sure your input has a length which is the exact multiple of 8 characters then this works easily:
var output =
String.Join(
" ",
Enumerable.Range(0, txt.Length / 8).Select(x => txt.Substring(x * 8, 8)));
If you need to ensure that the input has a length which is the multiple of 8 then do this first:
txt = txt.PadRight(txt.Length + txt.Length % 8 == 0 ? 0 : 8 - txt.Length % 8);

Combination of two arrays [closed]

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I have a integer array that shows the nodes of a path : {1,2,3,4,5}
1 --> 2 --> 3 --> 4 --> 5
But some nodes of this path can be optional.
For example node 4 is optional.
So, I can use this path 1 --> 2 --> 3 --> 4 --> 5
or this path 1 --> 2 --> 3 --> 5 to reach my destination.
I want to produce all path combinations.
//ProduceCombinations(int[] path,int[] possibleNodes)
{1*,2,3,4*,5*}
12345
-2345
123-5
-23-5
1234-
-234-
123--
-23--
12345
-2345
123-5
-23-5
1234-
-234-
123--
-23--

Here you go:
static void Main(string[] args)
{
int[] pathNodes = new int[] {1,2,3,4,5};
int[] optionalNodes = new int[] { 1, 4, 5 };
List<int[]> combies = ProduceCombinations(pathNodes, optionalNodes);
}
public static List<int[]> ProduceCombinations(int[] PathNodes, int[] OptionalNodes)
{
List<int[]> results = new List<int[]>();
results.Add((int[])PathNodes.Clone());
int index = 0;
for (int j = 0; j < OptionalNodes.Length; j++)
{
while (PathNodes[index] < OptionalNodes[j]) index++;
int lenght = results.Count;
for(int i = 0; i < lenght; i++)
{
var newSol = (int[])results[i].Clone();
newSol[index] = 0;
results.Add(newSol);
}
}
return results;
}

How to Zip two numbers using c# [closed]

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string A = "1234"
string B = "567890"
I want to zip the numbers. Out put should display as "1526374890"
what is the best way to achieve this using C# code.

You can do that with the following code. It does not make any assumptions about which string is longer.
string A = "1234";
string B = "567890";
char[] chars = new char[A.Length + B.Length];
int charsIndex = 0;
for (int i = 0; i < A.Length || i < B.Length; i++)
{
if(i < A.Length)
chars[charsIndex++] = A[i];
if(i < B.Length)
chars[charsIndex++] = B[i];
}
string result = new string(chars);
Console.WriteLine(result);

C# how to repeat an action [closed]

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Basically trying to shorten this:
octree[nodeIndices[0]].nodes[nodeIndices[1]]
.nodes[nodeIndices[2]].nodes[nodeIndices[3]].nodes[nodeIndices[4]]
I thought something like this could work, but not sure exactly how:
octree[nodeIndices[0]].(Enumerable.Repeat(node[nodeIndices[i]], 4)
edit: here's more code
OctreeNode[] nodes = octree;
ushort subdivisions = 1;
while (true)
{
ushort nodeIndex = 0;
OctreeNode node = nodes[nodeIndex];
if (node == null)
{
node = new OctreeNode();
node.nodes = new OctreeNode[8];
nodes = node.nodes;
}
subdivisions++;
if (subdivisions > 4)
break;
}
// the actual octree variable is unchanged

var result = octree[nodeIndices[0]];
for (int i = 1; i <= 4; i++)
result = result.node[nodeIndices[i]];
// do something with result;