如何访问程序循环中的值

本文关键字：循环 程序 何访问 访问 | 更新日期: 2023-09-27 18:35:56

using System;
using System.IO;
namespace FileApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            String a, b;
            int x, y, sum;
            string line1, line2;

                Console.WriteLine("enter the file name with location :");
                a = Console.ReadLine();
                Console.WriteLine("enter the second file name with location :");
                b = Console.ReadLine();
              using (StreamReader sr = new StreamReader(a))
                {
                    while ((line1 = sr.ReadLine()) != null)
                    {
                        Console.WriteLine("Value in the first file is :"+line1);
                    }
                }
                using (StreamReader sr = new StreamReader(b))
                {
                    while ((line2 = sr.ReadLine()) != null)
                    {
                        Console.WriteLine("Value in the second file is :" + line2);

                    }
                }
                x = Convert.ToInt32(line1);
                y = Convert.ToInt32(line2);
                Console.WriteLine("values are :" + line1, line2);
                Console.WriteLine("values are :" + x, y);
                sum = x + y;
                Console.WriteLine("The sum of values in both the file is :" + sum);

            Console.ReadKey();
        }
    }
}

我无法从 while 循环中获取值，以便我可以将它们转换为 int 并进行加法。我该怎么办？

如何访问程序循环中的值

add 

x = x + Convert.ToInt32(line1);

在第一个 while 循环中

y = y + Convert.ToInt32(line2);

在第二个 while 循环中

并删除 

  x = Convert.ToInt32(line1);
  y = Convert.ToInt32(line2);

你需要在循环中使用line1和line2，它们在循环之外不存在，你的代码甚至不会编译。您需要重构为如下所示的内容：

using (StreamReader sr = new StreamReader(a))
{
    while ((line1 = sr.ReadLine()) != null)
    {
        Console.WriteLine("Value in the first file is :"+line1);
          x = Convert.ToInt32(line1);
          sum += x;
    }
}
using (StreamReader sr = new StreamReader(b))
{
    while ((line2 = sr.ReadLine()) != null)
    {
        Console.WriteLine("Value in the second file is :" + line2);
        y = Convert.ToInt32(line2);
        sum += y;
    }
}

仅供参考：如果字符串中没有数字，Convert.ToInt32(string)函数将抛出FormatException。在这种情况下，您需要在try...catch块中编写此代码。

您可以将读取值的读取和计算放在一个 while 循环中。如果两者的行数相同，则循环将在计算所有总和后终止。否则，您将不得不停止读取您获得 null 的较小文件，并且可以在计算中使用零。

using (StreamReader sr = new StreamReader(a))
using (StreamReader sr = new StreamReader(b))
{
   while ((line1 = sr.ReadLine()) != null && (line2 = sr.ReadLine()) != null)
   {
       Console.WriteLine("Value in the first file is :"+ line1 ?? "null");
       Console.WriteLine("Value in the second file is :" + line2 ?? "null");
       x = Convert.ToInt32(line1==null ? "0" : line1);
       y = Convert.ToInt32(line2==null ? "0" : line2);
       Console.WriteLine("values are :" + line1, line2);
       Console.WriteLine("values are :" + x, y);
       sum = x + y;
       Console.WriteLine("The sum of values in both the file is :" + sum);
   }
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