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C简单控制台应用程序显示/逻辑问题

text-based console-application console list c#

0

lapartman · 技术社区 · 7 年前

        List<int> numberList = new List<int>();
        List<int> uniqueList = new List<int>();

        string input;
        int number = 0;
        bool over = false;

        while (!over)
        {
            input = Console.ReadLine();
            if (input == "quit")
            {
                over = true;
                break;
            }
            if (int.TryParse(input, out number))
            {
                numberList.Add(number);
            }
        }

        for (int i = 0; i < numberList.Count; i++)
        {
            if (!uniqueList.Contains(number))
            {
                uniqueList.Add(number);
            }
        }

        for (int i = 0; i < uniqueList.Count; i++)
        {
            Console.WriteLine(uniqueList[i]);
        }

        Console.ReadKey();

你好!我需要一些帮助这个程序接受数字,但键入“退出”后,它应该列出所有 独特的 已输入的数字。

例如,输入如下: 5,5,5,2,2,1,3 控制台只能显示一和三因为他们是唯一 独特的 数字。

问题是,当前表单中的程序只显示输入的最后一个唯一编号,而不是所有唯一编号,我不知道原因。

你能告诉我为什么吗?我需要做什么来列出所有的列表?

4 回复 | 直到 7 年前

1

3

mjwills Myles McDonnell 7 年前

    Dictionary<int, int> numberDictionary = new Dictionary<int, int>();

    string input;
    int number = 0;
    bool over = false;

    while (!over)
    {
        input = Console.ReadLine();
        if (input == "quit")
        {
            over = true;
            break;
        }
        if (int.TryParse(input, out number))
        {
            if (numberDictionary.TryGetValue(number), out int count)
            {
                numberDictionary[number] = count + 1;
            }
            else
            {
                numberDictionary.Add(number, 1);
            } 
        }
    }

    foreach(var item in numberDictionary)
    {
        if (item.Value == 1)
        Console.WriteLine(item.Key);
    }

    Console.ReadKey();

2

1

Stuart 7 年前

List<int> numbers = new List<int>{1, 2, 2, 3, 3, 3, 4, 4, 4, 5, 6, 6, 6};
var unique = numbers.Where(n => numbers.Count(m => m == n) == 1);
foreach(var u in unique)
    WriteLine(u);

n

numbers.Count(m => m == n)

3

1

Smaiil 7 年前

using System;
using System.Collections.Generic;
using System.Linq;

namespace EntryPoint.Concole
{
    class Program
    {
        static void Main(string[] args)
        {
           List<int> numberList = new List<int>();
           List<int> uniqueList = new List<int>();

           string input;
           int number = 0;
           bool over = false;

           while (!over)
           {
               input = Console.ReadLine();
               if (input == "quit")
               {
                  over = true;
                  break;
               }
               if (int.TryParse(input, out number))
               {
                  numberList.Add(number);
               }
           }

           var numbersDistinct = numberList.GroupBy(i => i);

           foreach (var num in numbersDistinct)
           {
              if (num.Count() == 1)
              {
                  uniqueList.Add(num.Key);
              }
           }

           for (int i = 0; i < uniqueList.Count; i++)
           {
              Console.WriteLine(uniqueList[i]);
           }

           Console.ReadKey();
        }
    }

4

0

Unknown User 7 年前

        List<int> numberList = new List<int>();
        List<int> uniqueList = new List<int>();

        string input;
        int number = 0;
        bool over = false;

        while (!over)
        {
            input = Console.ReadLine();
            if (input == "quit")
            {
                over = true;
                //break; // it is not needed since you have over = true
            }
            if (int.TryParse(input, out number))
            {
                numberList.Add(number);
            }
        }

        for (int i = 0; i < numberList.Count; i++)
        {
            //if (!uniqueList.Contains(number)) // this is the wrong line
            if (numberList.Count(q => q == numberList[i]) == 1)
            {
                //uniqueList.Add(number); // this is also wrong
                uniqueList.Add(numberList[i]);
            }
        }

        for (int i = 0; i < uniqueList.Count; i++)
        {
            Console.WriteLine(uniqueList[i]);
        }

        Console.ReadKey();