C# - 在变量中保留正确猜测的总数答案

【问题标题】：C# - Keeping total number of correct guesses inside a variableC# - 在变量中保留正确猜测的总数
【发布时间】：2020-12-27 18:39:48
【问题描述】：

编程初学者并被分配了一个正面或反面硬币翻转项目。

我想出了如何让它随机生成请求的翻转次数并打印出答案。但是，我应该将用户输入出现在correctCount 变量中的次数加起来，但我找不到任何方法。我试过在这里和不同的网站上搜索，而不是在整个谷歌上搜索。我假设我需要获取他们的字符串输入并以某种方式对其进行转换，例如if result == string，然后基本上是correctCount + 1，但无法弄清楚如何实现这一点，因为您无法使用int 和@987654325 做到这一点@。任何信息或提示都会非常有帮助 - 谢谢！

    class Coin
    {

        static void Main(string[] args)

        // UserInput
        {
            Console.Write("Guess which will have more: heads or tails?");
            string headsOrTailsGuess = Console.ReadLine() + "\n";
  

            Console.Write("\n" + "How many times shall we flip the coin? ");
            int numberOfFlips = int.Parse(Console.ReadLine() + "\n");


            // Declare variables
            int correctCount = 0;
            int heads = 0;
            int tails = 1;

            Random rand = new Random();

            for (int i = 0; i < numberOfFlips; i++)
            {
                int result = rand.Next(0, 2);

                if (result == 0)
                {
                    Console.WriteLine("Heads!");
                } 
                else 
                {
                    Console.WriteLine("Tails!");
                }
 
            }
            Console.WriteLine("Your guess, " + headsOrTailsGuess + "came up " + correctCount + " time(s).");```

【问题讨论】：

您需要先将输入字符串headsOrTailsGuess 转换为计算机可以使用的字符串。最好是 int 或 bool，然后你可以在 if 语句中进行计数。
严格来说指令要求用户输入heads或tails。然后代码继续评估 Heads 或 Tails。此外，int.Parse 不适用于用户将输入的非数字。使用TryParse
我从未见过Console.ReadLine() + "\n"，除非它是一个超级秘密魔法，否则+ "\n" 部分毫无用处。

标签： c# coin-flipping

【解决方案1】：

正如 PMF 所提到的，您不仅要接收用户的选择，还要对其进行分析。尽管您可能想为用户输入添加一些验证，但在这里进行一个简单的比较就足够了。

static void Main(string[] args)

    // UserInput
    {
        int choice; //variable for parsed user choice
        Console.Write("Guess which will have more: heads or tails?");
        string headsOrTailsGuess = Console.ReadLine() + "\n";
        if(headsOrTailsGuess.ToLower().Trim() == "heads"){ //here you look if its heads
            choice = 0;
        }
        else{ //we can write additional if here to avoid other options from counting as tails
            choice = 1;
        }

        Console.Write("\n" + "How many times shall we flip the coin? ");
        int numberOfFlips = int.Parse(Console.ReadLine() + "\n");


        // Declare variables
        int correctCount = 0;
        int heads = 0;
        int tails = 1;

        Random rand = new Random();

        for (int i = 0; i < numberOfFlips; i++)
        {
            int result = rand.Next(0, 2);

            if (result == 0)
            {
                Console.WriteLine("Heads!");
            } 
            else 
            {
                Console.WriteLine("Tails!");
            }
            if(result == choice){ //comparing result to parsed choice and incrementing the counter
                correctCount++; 
            }

        }
        Console.WriteLine("Your guess, " + headsOrTailsGuess + "came up " + correctCount + " time(s).");

}

【讨论】：

【解决方案2】：

这是使用 Linq 的另一种方法。

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

public class Program
{
    public static void Main()
    {
         // UserInput
        {
            Console.Write("Guess which will have more: heads or tails?");
            string headsOrTailsGuess = Console.ReadLine();
  
            Console.Write("\n" + "How many times shall we flip the coin? ");
            int numberOfFlips = int.Parse(Console.ReadLine() + "\n");

            // Declare variables
            List<string> resultList  = new List<string>();
            Random rand = new Random();
      
            for (int i = 0; i < numberOfFlips; i++)
            {
                int result = rand.Next(0, 2);
                resultList.Add(result == 1? "Heads!" : "Tails!");
            }
            var guessCount  = resultList.Where(a=>a.ToUpper().Contains(headsOrTailsGuess.ToUpper())).Count();
            resultList.ForEach( a=> Console.WriteLine(a));
            Console.WriteLine("Your guess, " + headsOrTailsGuess + " came up " + guessCount + " time(s).");
            Console.WriteLine(headsOrTailsGuess);
        }
    }
}

【讨论】：

【解决方案3】：

using System;

Console.WriteLine("Guess which will have more: heads or tails?");

var headsChosen = false;

var input = string.Empty;
do
{
    input = Console.ReadLine();

    headsChosen = input.ToLower() == "heads";

} while (input.ToLower() != "heads" && input.ToLower() != "tails");


Console.WriteLine("How many times shall we flip the coin?");

var flips = 0;

do
{
} while (!int.TryParse(Console.ReadLine(), out flips));

var rnd = new Random();

var heads = 0;
var tails = 0;

for (int i = 0; i < flips; i++)
{
    if (rnd.Next(0, 2) == 0)
    {
        Console.WriteLine("Heads!");
        heads++;
    }
    else
    {
        Console.WriteLine("Tails!");
        tails++;
    }
}

var userGuessed = (headsChosen && heads > tails) || (!headsChosen && tails > heads);

Console.WriteLine($"You {(userGuessed ? "guess" : "loose")}!");

【讨论】：