使用C#将空间转换为"+"

string str = "Hello World";
string result = str.Replace(" ", "+");
Console.WriteLine(result);  // 输出：Hello+World

using System;

public class Point2D
{
    public double X { get; set; }
    public double Y { get; set; }

    public Point2D(double x, double y)
    {
        X = x;
        Y = y;
    }

    public override string ToString()
    {
        return $"({X}, {Y})";
    }
}

public class Program
{
    public static void Main()
    {
        Point2D point = new Point2D(3.5, 2.8);
        string result = $"{point.X}+{point.Y}";
        Console.WriteLine(result);  // 输出：3.5+2.8
    }
}

using System;

public class Point3D
{
    public double X { get; set; }
    public double Y { get; set; }
    public double Z { get; set; }

    public Point3D(double x, double y, double z)
    {
        X = x;
        Y = y;
        Z = z;
    }

    public override string ToString()
    {
        return $"({X}, {Y}, {Z})";
    }
}

public class Program
{
    public static void Main()
    {
        Point3D point = new Point3D(1.2, 3.4, 5.6);
        string result = $"{point.X}+{point.Y}+{point.Z}";
        Console.WriteLine(result);  // 输出：1.2+3.4+5.6
    }
}