How do I input a list of numbers but make sure the program doesn't allow me to repeat any numbers?

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I made a program asking me to input 10 different numbers ranging from 10 to 100 and the numbers can't repeat. I can make it so the program doesn't allow numbers below 10 or greater than 100, but I can't make it so they don't repeat without making a very long code.

What I have tried:

I do the "for....else" statement to keep the numbers in the 10 - 100 range. I used it to make sure the numbers don't repeat also. It gets very lengthy the closer I get to inputting the tenth number. The program works, but it is too much to type in.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp9
{
    class Program
    {
        static void Main(string[] args)
        {
            string userNumber;
            string previousNumber = ("");
            int numberint;

            Console.WriteLine("I need you to enter 10 different numbers ranging from 10 to 100");

            for (int number = 0; number < 10; number++)
                
            {
                Console.Write("Please enter your number: ");
                userNumber = Console.ReadLine();
                numberint = int.Parse(userNumber);
                if (numberint > 100 || numberint < 10 || userNumber == previousNumber) 
                {
                    Console.WriteLine("Invalid number. Please enter a number ranging from 10 to 100");
                    number--;
                }
                else
                    Console.WriteLine("Thank you for entering " + userNumber);
            }

Posted 1-Dec-17 16:00pm

unholywholewheat

Updated 2-Dec-17 4:16am

v2

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Comments

Patrice T 1-Dec-17 22:17pm

And you plan to show your code?

Richard MacCutchan 2-Dec-17 8:58am

Sounds like you are doing it wrong. But since we cannot see your code we have no idea exactly what you are doing.

2 solutions

Solution 1

This is just an example algorithm in pseudo code to solve your problem:

0. Initialize an array container
1. Get a user input 
2. Converted that input to a number
3. IF (that number is between 10 and 100 AND is not already in the array container) THEN
   3.1  Add it to that array container
4. Go to 1 if that array container contains less than 10 elements.

You can use any programming language to implement this algorithm. For specific language syntaxes and features, ask Google.

Posted 1-Dec-17 16:48pm

Peter Leow

Updated 1-Dec-17 16:49pm

v2

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CPallini · Accepted Answer · 2017-12-02T02:19:00

You might use a HashSet[^] for the purpose, e.g.

HashSet<int> number = new HashSet<int>();
while (number.Count < 10)
{
  int candidate;
  Console.WriteLine("Please, enter a number between 10 and 100");
  if (int.TryParse(Console.ReadLine(), out candidate))
  {
    if (candidate >= 10 && candidate <= 100)
      number.Add(candidate); // adding a duplicate to the HashSet has no effect
  }
}
// 'number' contains 10 different integers in the 10..100 range. Showing them:
foreach (int n in number)
  Console.WriteLine(n);