我需要一个奇怪的C＃控制台应用程序循环 [英] I need an odd type of loop for C# console application

问题描述

我试图在学校找到最容易使用的循环作业。我们正在使用C＃2012，我需要它在同一行输出一个数字，表示它是哪一天（当天的整数，只需要一个数字 - 1,2,3,4等等）和在每天的数字右边，我需要它输出一个以0.01开头的小数/双倍，每天加倍（所以第2天需要说2然后0.02间距足以让标题显示日期：和量）。最终结果需要打印出类似下面的内容 -



当天欠款

--- -------- ---

1 0.01

2 0.02

3 0.04



需要计算到第64天





到目前为止我有以下代码，但它给了我变量i的错误。



错误1使用未分配的局部变量'i'f：\documents\visual studio 2012 \Projects\RichBeggarBC\RichBeggarBC\Program.cs 18 23 RichBeggarBC



即使我从双i = 0.01中删除= 0.01，也会出现相同的错误。

I am trying to find out the easiest to use loop for an assignment in school. We are using C# 2012 and I need it to on the same line output a number representing which day it is (integer for the day, just needs to be a number - 1, 2, 3, 4, etc going down the lines) and to the right of each day number I need it to put out a decimal/double that starts with 0.01 and doubles each day (so day 2 would need to say 2 and then 0.02 spaced out enough to have a header showing "Day:" and "Amount"). End result needs to print out something similar to the below -

Day Amount Owed
--- -----------
1 0.01
2 0.02
3 0.04

needs to calculate until day 64


I have the below code so far, but it gives me errors for the variable i.

Error 1 Use of unassigned local variable 'i' f:\documents\visual studio 2012\Projects\RichBeggarBC\RichBeggarBC\Program.cs 18 23 RichBeggarBC

Same error is given even if I remove the = 0.01 from the double i = 0.01;.

static void Main(string[] args)
        {
            //since the output will require a decimal, I am using a double as the variable type to grant more than 7 spaces
            double number;
            //used int for day
            int day = 1;
            double i = 0.01;

            Console.Write("Day:     Amount owed:\n");

            //for loop to run until number is made
            for (i = 0.01; day <= 64; i *= 2)
                Console.WriteLine (day);


            //console.readline used to sop program from finishing in order to allow it to remain open
            Console.ReadLine();
        }

我刚试过一次嵌套for循环并在尝试使用时出错。

I have also just tried a nested for loop and get errors when trying to use it.

for (int i =1; i <= 64; i++)
{
    for (double j = 0.01; j * 2)
    {
        Console.WriteLine (i);
    }
    Console.WriteLine ();
}

这给了我2个错误。我得到1个错误，说它预期了;在j * 2之后，错误2表示不能将双重变为bool并突出显示j * 2）。我只是想这样做，所以每一行打印i（并增加1）然后j后面，以便它会像原始帖子中的表格一样读取。

This gives me 2 errors. I get 1 error saying it expected a ; after the j * 2) and error 2 says cannot change double into bool and highlights j * 2). I just want to make it so each line prints i (and increment by 1) and then j after it so that it would read like in the table in the original post.

推荐答案

关于第一个循环

Concerning the first loop

for (i = 0.01; day <= 64; i *= 2)

循环的中断条件基于日变量。但是，你根本没有增加这一天。



为什么不循环一天并在循环内增加i。所以循环将是

The break condition for the loop is base on day variable. However, you don't increment the day at all.

Why not loop through the day and increment i inside the loop. So the loop would be

for (day = 1; day <= 64; day++)

第二个循环的内容

What comes to the second loop

for (double j = 0.01; j * 2)

您应该添加条件，循环持续多长时间。循环总是包含三个部分：

You should add the condition, how long the loop is continued. The loop always contains three parts:

for (initializer; condition; iterator)

现在你错过了这个错误的条件

Now you're missing the condition thus the error

问题是我没有看到除了day = 64之外的条件。因此，第二个循环可以 -



for（double j = 0.01; day< = 64; j * 2）



另外，这是否会随着日期的增加而增加，以便第2天= 0.02，第3天= 0.04等？

The issue is that I do not see a condition other than day = 64. Therefore would the 2nd loop be able to be -

for (double j = 0.01; day <= 64; j * 2)

Also, would this keep it incrementing with the day so that day 2 = 0.02, day 3 = 0.04, etc?

只是更新。我进行了以下更改，我让它在没有console.writeline（day）的情况下运行 - 但是它只运行了1天，其余的应用程序没有任何内容，它继续无限。我需要它为第1天添加0.01的总和，并且每天乘以2，在第2天的右边第2个列（大约5-6个空格）。我不确定为什么它当天没有增加到64的限制以及为什么它没有写增量线。

Just an update. I made the below changes and I got it to run without the console.writeline (day) - however it only ran 1 for the day and nothing for the rest of the application and it continued for infinity. I need it to add the total of the 0.01 for day 1 and multiplied by 2 each day for a 2nd "column" to the right of the day number (about 5-6 spaces away). I am not sure why it is not incrementing to a limit of 64 on the day and why it is not writing the line for the increment.

for (day = 1; day <= 64; day++)
{
    for (double j = 0.01; day <= 64; j *= 2)
    {
        Console.WriteLine (day);
    }
    Console.WriteLine ();
}

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