Question

我在循环程序时遇到问题，以便在用户输入“退出”或“退出”时它会突然出现循环。

当我输入任何字符串时，我的程序在尝试将字符串输入解析为int时崩溃。有什么建议吗？

    namespace DiceRolling
    {
    /* We’re going to write a program that makes life easier for the player of a game like this. Start the
    program off by asking the player to type in a number of dice to roll.Create a new Random
    object and roll that number of dice.Add the total up and print the result to the user. (You should
    only need one Random object for this.) For bonus points, put the whole program in a loop and allow them to keep typing in numbers
    until they type “quit” or “exit”.  */

    class DiceRolling
    {
        static void RollDice(int numTries) 
        {
            Random random = new Random();

            //Console.Write("Please enter the number of dice you want to roll: ");
            //int numTries = Convert.ToInt32(Console.ReadLine());
            int sum = 0;
            int dieRoll;

            for (int i = 1; i <= numTries; i++)
            {
                dieRoll = random.Next(6) + 1;
                Console.WriteLine(dieRoll);
                sum += dieRoll;
            }
            Console.WriteLine("The sum of your rolls equals: " + sum);
        }

        static void Main(string[] args)
        {
            while (true)
            {
                Console.Write("Please enter the number of dice you want to roll: ");
                string input = Console.ReadLine();
                int numTries = Convert.ToInt32(input);
                //bool isValid = int.TryParse(input, out numTries);
                RollDice(numTries);
                Console.ReadKey();
                if (input == "quit" || input == "exit")
                    break;
            }
        } 
    }   
}

Answer 1

Tigrams非常接近，这稍微好一些

Console.Write("Please enter the number of dices you want to roll: ");
string input = Console.ReadLine();
while (input != "quit" && input != "exit")
{
  int numTries = 0;
  if (int.tryParse(input, out numTries)
  {
    RollDice(numTries);
  }
  Console.Write("Please enter the number of dices you want to roll: ");
  input = Console.ReadLine();
}

Answer 2

    while (true)
    {
        Console.Write("Please enter the number of dices you want to roll: ");
        string input = Console.ReadLine();
        if (input == "quit" || input == "exit") //check it immediately here 
            break;

        int numTries = 0; 
        if(!int.TryParse(input, out numTries)) //handle not valid number
        {
           Console.WriteLine("Not a valid number");
           continue;
        }


        RollDice(numTries);
        Console.ReadKey();

    }

Answer 3

试图让它尽可能与你拥有的相似

    while (true)
    {
        Console.Write("Please enter the number of dices you want to roll: ");
        string input = Console.ReadLine();
        int numTries;
        if (int.TryParse(input, out numTries))
        {
            RollDice(numTries);
        }
        else if(input == "quit" || input == "exit")
        {
            break;
        }
    }

Answer 4

尝试int numTries =int.Parse(input != null ? input: "0");

用户输入退出或退出c＃时断开循环

4 个答案: