运行我在 C# 中应用十进制格式后的代码时出错

Question

我正在为我的角色的移动创建一个代码（为了我的任务），并想找出第一个点和第二个点之间的距离和角度。我使用 Math class 和 ToString 方法来获得所需的结果。但是在运行代码之后（使用 visual studio）我得到了这个错误：

Unhandled Exception: System.FormatException: Format specifier was invalid. at System.Number.FormatSingle(Single value, String format, NumberFormatInfo info) at System.Single.ToString(String format) at PeerGradedAssignment1.Program.Main(String[] args) in G:\RIT\new vs coursera c3 progjects\PeerGradedAssignment1\PeerGradedAssignment1\Program.cs:line 58 .

这是我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PeerGradedAssignment1
{
    /// <summary>
    /// For deciding the approach of point 1 to point 2
    /// </summary>

    class Program
    {   /// <summary>
        /// Taking values of points     
        /// </summary>
        /// <param name="args">Command-line args</param>
        static void Main(string[] args)
        {
            // Asking for values(X,Y) of point1 and point

            Console.Write("Welcome");
            Console.WriteLine(". In this aplication I will calculate" +
                          "the distance between two pints and the amgle between them.");
            Console.WriteLine();

            Console.Write("Enter the X value for the 1st point: ");
            float pointX1 = float.Parse(Console.ReadLine());

            Console.Write("Enter the Y value for the 1st point: ");
            float pointY1 = float.Parse(Console.ReadLine());

            Console.WriteLine();

            Console.Write("Enter the X value for the 2nd point: ");
            float pointX2 = float.Parse(Console.ReadLine());

            Console.Write("Enter the Y value for the 2nd point: ");
            float pointY2 = float.Parse(Console.ReadLine());

            // Claculating the distance between point1 and point2

            float deltaX = pointX2 - pointX1;
            float deltaY = pointY2 - pointY1;
            // dist12 , 12 stands for 1-2
            float squaredist12 = deltaX * deltaX + deltaY * deltaY;
            float dist12 = (float)Math.Sqrt(squaredist12);
            Console.WriteLine("Distance between point and point 2:" + " " + dist12);

            // Calculating the angle between them

            float radians = (float)Math.Atan2(deltaX,deltaY);

           // Converting radians to angles

            float degrees = (float)radians * (180 / (float)Math.PI);
            Console.WriteLine(degrees);
            Console.WriteLine(dist12.ToString("D3"));
        } 
    }
}

This is the image for result

感谢您的帮助。

Answer 1

格式 D3 不能与浮点数一起使用。你需要使用 n3

例如

Console.WriteLine(dist12.ToString("n3"));

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