我需要它从数组中减去数字，然后再次显示数组 [英] I need it to subtract the number from the array and then display the array again

问题描述

static void Main(string[] args)
{
    double[] entered = new double[5];
    double number = 0;

    for (int i = 0; i < 5; i++)
    {
        Console.WriteLine("Please enter in a number " + entered);
    }


        Console.WriteLine("Please enter a number to subract from previous numbers " + number);
        number = Convert.ToDouble(Console.Read());
        entered = entered [i] - number;
        Console.WriteLine("After subracting " + number);

我的尝试：



我已经尝试了我能想到的一切。我是初学者。

What I have tried:

I have tried everything i could think of. I am a beginner though.

推荐答案

你需要从数组的每个元素中减去输入的数字;你不能只是从数组本身中减去它。



你的代码实际上从未向用户询问初始数字。您只需显示请输入数字System.Double []五次。你需要使用 Console.ReadLine（）来读取用户的数字。



你应该避免使用 Convert.ToDouble - 如果用户输入的内容不是数字，则会引发异常。使用 Double.TryParse [ ^ ]。

You need to subtract the entered number from each element of the array; you can't just subtract it from the array itself.

Your code never actually asks the user for the initial numbers. You just display "Please enter in a number System.Double[]" five times. You need to use Console.ReadLine() to read the numbers from the user.

You should avoid using Convert.ToDouble - if the user enters something that isn't a number, that will throw an exception. Use Double.TryParse[^] instead.

static double ReadANumber(string prompt)
{
    double result;
    string value;
    do
    {
        Console.WriteLine(prompt);
        value = Console.ReadLine();
    }
    while (!double.TryParse(value, out result));
    
    return result;
}

static void Main()
{
    double[] entered = new double[5];
    for (int index = 0; index < entered.Length; index++)
    {
        entered[index] = ReadANumber(

输入数字{（index + 1）}：）;
}

Console.WriteLine（

"Enter number {(index + 1)}:"); } Console.WriteLine(

在减去之前：[{string.Join（， ，输入）}]< /跨度>）;

double number = ReadANumber（ 输入要减去的数字：）;
for （ int index = 0 ; index < entered.Length; index ++）
{
输入[index] - = number;
}

Console.WriteLine（

"Before subtracting: [{string.Join(", ", entered)}]"); double number = ReadANumber("Enter the number to subtract:"); for (int index = 0; index < entered.Length; index++) { entered[index] -= number; } Console.WriteLine(

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