C# 控制台应用程序，可以找到一些数字的每个组合，但只有在它们可以除以 3 时才写入

Question

我必须执行一项任务。请帮助我。 © 想要一个 c sharp 控制台应用程序，它可以找到一些数字的每个组合，但只在它们可以被 3 除时写入。

我们一袋里有 15 张卡片。我们将随机抽取 3 张卡片（不更换）。之后我们将添加它们（card1+card2+card3），如果它们的结果可以除以 3，那么我们将它们写入控制台。[（card1+card2+card3）/3]=0

不知道从哪里开始。非常感谢任何帮助！

Answer 1

给定 3 个数字，您可以使用取模运算符判断它们是否可以被 3 整除：

List<int> numbers = new List<int> {4, 8, 11}; // Represents three random cards

// This will be set to true if the sum of the numbers is evenly divisible by 3
bool numbersAreDivisibleByThree = numbers.Sum() % 3 == 0;

这是一个如何使用它的例子：

private static void Main()
{
    var cardBag = new List<int>();
    var drawnCards = new List<int>();

    // Add 15 numbers to the cardBag
    for (int i = 1; i <= 15; i++)
    {
        cardBag.Add(i);
    }

    // Draw 3 cards at random
    var rnd = new Random();

    while (drawnCards.Count < 3)
    {
        var candidateCard = cardBag[rnd.Next(15)];

        // In this implementation, we only add unique cards
        if (!drawnCards.Contains(candidateCard))
            drawnCards.Add(candidateCard);
    }

    // This will be set to true if the sum of the numbers is evenly divisible by 3
    bool numbersAreDivisibleByThree = drawnCards.Sum() % 3 == 0;

    // Output results to console
    Console.WriteLine("The three random cards drawn from the deck are: {0}", 
        string.Join(", ", drawnCards));

    Console.WriteLine("The sum of the cards is: {0}", drawnCards.Sum());

    Console.WriteLine("Is the sum of the cards evenly divisible by three? {0}.", 
        numbersAreDivisibleByThree);
}

Answer 2

我想你可以从中得到一些启发。

public List<int[]> getCombinations(int[] inArray)
{
        List<int[]> outList = new List<int[]>();
        for (int i = 0; i < inArray.Length; i++)
            for (int j = i + 1; j < inArray.Length; j++)
                for (int k = j + 1; k < inArray.Length; k++)
                        {
                            int[] outCombination = new int[] { inArray[i], inArray[j], inArray[k] };
                            outList.Add(outCombination);
                        }
        return outList;
}


static void Main(string[] args)
{
        int[] inArray = new int[] { 0, 1, 2, 3, 4, 5 };

        // Returned list of combinations...

        Program ns = new Program();

        List<int[]> Combinations = ns.getCombinations(inArray);

        // example: Displaying the results...
        foreach (int[] outArray in Combinations)
        {
            Console.Write(outArray[0] + "," + outArray[1] + "," + outArray[2]);
        }
}

Answer 3

既然你看起来像个菜鸟，这里有一个简单的查看方法（虽然不是最有效和成本最低的）：

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

namespace RandomGeneratorPractice
{
    class Program
    {
        static void Main(string[] args)
        {
            Random random = new Random();

            int randomNumber1 = random.Next(1, 15);
            int randomNumber2 = random.Next(1, 15);
            int randomNumber3 = random.Next(1, 15);

            bool bln = true;

            while(bln)
            {
            if (randomNumber1 == randomNumber2)
            {
                randomNumber2 = random.Next(1, 15);

                bln = true;
            }
            else if (randomNumber2 == randomNumber3 || randomNumber1==randomNumber3)
            {
                randomNumber3 = random.Next(1,15);
                bln = true;
            }
            else if ((randomNumber1 != randomNumber2) && (randomNumber1 != randomNumber3) && (randomNumber2 != randomNumber3))
            {
                bln = false;
            }

            }

            int dividend = randomNumber1 + randomNumber2 + randomNumber3;
            double divisor = 3;
            double quotient = (randomNumber1 + randomNumber2 + randomNumber3) / 3;

            Console.WriteLine("(" + randomNumber1 + "+" + randomNumber2 + "+" + randomNumber3 + ") / 3 = " + (dividend / divisor));

            if (dividend % divisor == 0)
            {
                Console.WriteLine("You CAN divide by 3 evenly");
            }
            else
            {
                Console.WriteLine("You CANNOT divide by 3 evenly");
            }

            Console.WriteLine("Press ENTER to exit...");
            Console.Read();


        }
    }
}

C# 控制台应用程序，可以找到一些数字的每个组合，但只有在它们可以除以 3 时才写入

C# console application that can find every combination of some numbers but only writes if they can divide by 3

c#

combinations