如何从控制台读取用户输入？ [英] How can I read user input from the console?

问题描述

我想从用户那里得到一个数字，然后将该数字乘以Pi。我对此的尝试如下。但是 a 包含乱码。例如，如果我插入 22 ，则 a 包含 50 。我究竟做错了什么？我没有得到任何编译器错误。

I want to get a number from the user, and then multiply that number with Pi. my attempt at this is below. But a contains gibberish. For example, if I insert 22, then a contains 50. What am I doing wrong? I don't get any compiler errors.

double a,b;
a = Console.Read();
b = a * Math.PI;
Console.WriteLine(b);

推荐答案

我不确定您的问题是什么（因为您尚未告诉我们），但我猜是在

I'm not sure what your problem is (since you haven't told us), but I'm guessing at

a = Console.Read();

这只会从控制台读取一个字符。

This will only read one character from your Console.

您可以将程序更改为此。为了使其更强大，请接受多个char输入，并确认输入实际上是数字：

You can change your program to this. To make it more robust, accept more than 1 char input, and validate that the input is actually a number:

double a, b;
Console.WriteLine("istenen sayıyı sonuna .00 koyarak yaz");
if (double.TryParse(Console.ReadLine(), out a)) {
  b = a * Math.PI;
  Console.WriteLine("Sonuç " + b); 
} else {
  //user gave an illegal input. Handle it here.
}

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