将在文件中查找素数的算法的结果存储 (C#)

Question

我正在尝试制作一个程序来查找质数，将它们显示在控制台中并将这些数字存储在一个文件中。该程序已经将数字存储在一个文件中，但它不会在控制台中显示数字。这是我的代码：

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

namespace Priemgetallen
{
    class Program
    {
    static void Main()
    {
        using (StreamWriter writer = new StreamWriter("C://Users//mens//Documents//PriemGetallen.txt"))
        {
            Console.SetOut(writer);
            Act();
        }
    }

    static void Act()
    {

        double maxGetal = double.MaxValue;
        Console.WriteLine("--- Primes between 0 and 100 ---");
        for (int i = 0; i < maxGetal; i++)
        {
            bool prime = PrimeTool.IsPrime(i);
            if (prime)
            {
                Console.Write("Prime: ");
                Console.WriteLine(i);
            }
        }
    }

    public static class PrimeTool
    {
        public static bool IsPrime(int candidate)
        {
            // Test whether the parameter is a prime number.
            if ((candidate & 1) == 0)
            {
                if (candidate == 2)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            // Note:
            // ... This version was changed to test the square.
            // ... Original version tested against the square root.
            // ... Also we exclude 1 at the end.
            for (int i = 3; (i * i) <= candidate; i += 2)
            {
                if ((candidate % i) == 0)
                {
                    return false;
                }
            }
            return candidate != 1;
        }
    }

}

}

Answer 1

那是因为 Console.SetOut(writer); 行。您正在将控制台输出发送到文件。

不要像现在这样，放弃 StreamWriter 而是使用：

if (prime)
{
    var primeText = string.Format("Prime: {0}", i);
    Console.WriteLine(primeText );
    File.AppendAllText(@"C:\Users\mens\Documents\PriemGetallen.txt",
                       primeText + Environment.NewLine);
}

将在文件中查找素数的算法的结果存储 (C#)

Store the outcome of an algorithm that looks for prime numbers in a file (C#)

c#

algorithm

primes