Question

class Program
{
    static void Main(string[] args)
    {
        Console.BackgroundColor = ConsoleColor.Blue;
        Console.Clear();
        do
        {
            //Print command
            string print = Console.ReadLine();
            if (print.ToLowerInvariant().StartsWith("print: "))
            {
                string p2 = print.Substring(print.IndexOf(' ') + 1);
                Console.WriteLine(p2);
            }

            string var = Console.ReadLine();
            if (var.ToLowerInvariant().StartsWith("var "))
            {
                string v2 = var.Substring(var.IndexOf(' ') + 1);
            }
        }
        while (true);
    }
}

我现在想要如何通过键入var然后将数字设置为字符串来创建var，并且能够打印数字或字符串

Answer 1

var是一个关键字。通过将var重命名为variable：

来解决问题

class Program
{
    static void Main(string[] args)
    {
        Console.BackgroundColor = ConsoleColor.Blue;
        Console.Clear();
        do
        {
            //Print command
            string print = Console.ReadLine();
            if (print.ToLowerInvariant().StartsWith("print: "))
            {
                string p2 = print.Substring(print.IndexOf(' ') + 1);
                Console.WriteLine(p2);
            }

            string variable = Console.ReadLine();
            if (variable.ToLowerInvariant().StartsWith("var "))
            {
                string v2 = variable.Substring(variable.IndexOf(' ') + 1);
            }
        }
        while (true);
    }
}

编辑：新要求，这是我提出的代码，但没有错误处理：

using System;
using System.Collections.Generic;

namespace Variables
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.BackgroundColor = ConsoleColor.Blue;
            Console.Clear();
            var dict = new Dictionary<string, int>();
            do
            {
                //Print command
                string command = Console.ReadLine();
                if (command.ToLowerInvariant().StartsWith("print: "))
                {
                    string p2 = command.Substring(command.IndexOf(' ') + 1);
                    if (dict.ContainsKey(p2)) Console.WriteLine(dict[p2]);
                    else Console.WriteLine("Variable {0} undefined!");
                }
                if (command.ToLowerInvariant().StartsWith("var "))
                {
                    string v2 = command.Substring(command.IndexOf(' ') + 1);
                    string[] parts = v2.Split(new char[]{'='}, 2,  StringSplitOptions.RemoveEmptyEntries);
                    parts[0] = parts[0].Trim();
                    parts[1] = parts[1].Trim();
                    dict.Add(parts[0], int.Parse(parts[1]));
                }
            }
            while (true);
        }
    }
}

如何创建命令以添加变量并让print命令打印它的数字或字符串

1 个答案: