c# - 如何分离不分离的输入C#

Question

程序必须求和偶数和奇数，然后将它们相乘。

当我输入像 12345 这样的数字时，问题就来了。该数组采用 1 元素之类的数字，但为了使我的代码正常工作，当我像这样放置它时，它必须分隔输入 12345。

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

namespace Lab_Methods
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] number = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();

            int even = 0;
            int odd = 0;

            for (int i = 0; i < number.Length; i++)
            {

                if (number[i] % 2 == 0)
                {
                    even = even + number[i];
                }
                else
                {
                    odd = odd + number[i];
                }
            }
            Console.WriteLine(even * odd);
        }

    }
}

Answer 1

如果您想在 ' ' 上拆分(空格)，您的输入应使用定界符:“1 2 3 4 5”

   // Separated input like "1 2 3 45 6 789"
   // we don't have to materialize into array
   // let's be nice: allow tabulation as well as space,
   //                tolerate leading/trailing and double spaces: "  1   2 3 " 
   var numbers = Console
     .ReadLine() 
     .Split(new char[] { ' ', '\t'}, StringSplitOptions.RemoveEmptyEntries) // let's be nice
     .Select(item => int.Parse(item));

   int even = 0;
   int odd = 0;

   foreach (var number in numbers) {
     if (number % 2 != 0)    
       odd += number;
     else
       even += number;  
   }

   Console.WriteLine(even * odd);

如果您想枚举单个数字内的数字(例如“12345”内)

   // Single number input like "12345678"
   var numbers = Console
     .ReadLine()  
     .Where(c => c >= '0' && c <= '9') // characters in '0'..'9' range
     .Select(c => c - '0');            // corresponding ints

   // Then as usual

   int even = 0;
   int odd = 0;

   foreach (var number in numbers) {
     if (number % 2 != 0)    
       odd += number;
     else
       even += number;  
   }

   Console.WriteLine(even * odd);