将 Double 转换为 Bool

Question

我正在尝试查找给定点是否在圆内，这是我目前的解决方案

using System;

//Write an expression that checks if given point (x, y) is inside a circle K({0, 0}, 2).

class Program
{
    static void Main()
    {
        Console.Write("Enter x: ");
        double x = double.Parse(Console.ReadLine());
        Console.Write("Enter y: ");
        double y = double.Parse(Console.ReadLine());
        bool insideCircle = (double)Math.Sqrt((x * x) + (y + y) <= 2);

    }
}

我收到无法从 bool 转换为 double 的错误。有人可以帮助我吗？

Answer 1

您应该将 <= 2 移到 Math.Sqrt() 之外。

        Console.Write("Enter x: ");
        double x = double.Parse(Console.ReadLine());
        Console.Write("Enter y: ");
        double y = double.Parse(Console.ReadLine());
        bool insideCircle = Math.Sqrt((x * x) + (y + y)) <= 2;

Answer 2

你的括号放错地方了。

bool insideCircle = Math.Sqrt((x * x) + (y + y)) <= 2.0;

Answer 3

我相信你的意思是：

class Program
{
    static void Main()
    {
        Console.Write("Enter x: ");
        double x = double.Parse(Console.ReadLine());
        Console.Write("Enter y: ");
        double y = double.Parse(Console.ReadLine());

        // <= 2 is outside the brackets, not inside
        bool insideCircle = Math.Sqrt((x * x) + (y + y)) <= 2;
    }
}

将 Double 转换为 Bool

Converting Double to Bool

c#

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