Question

我试图创建一个包含3种不同选项的小游戏，但我不确定如何在代码中编写：如果答案不是1,2或3，请继续提问，直到输入为1,2或3.

        Console.WriteLine("What do you want to do?");
        Console.WriteLine("1. Eat");
        Console.WriteLine("2. Drink");
        Console.WriteLine("3. Play");
        string answer = Console.ReadLine();

        if (answer == "1")
        {
            Console.WriteLine("you picked number 1");
        }
        if (answer == "2")
        {
            Console.WriteLine("You picked number 2");
        }
        if (answer == "3")
        {
            Console.WriteLine("You picked number 3");
        }
        // if answer isn't 1,2 or 3, keep asking the question untill the input is correct.

Answer 1

  var answer="";
  while(true)
  {
    Console.WriteLine("What do you want to do?");
    Console.WriteLine("1. Eat");
    Console.WriteLine("2. Drink");
    Console.WriteLine("3. Play");
    answer = Console.ReadLine();

    if (answer == "1")
    {
        Console.WriteLine("you picked number 1");
        break;
    }
    if (answer == "2")
    {
        Console.WriteLine("You picked number 2");
        break;
    }
    if (answer == "3")
    {
        Console.WriteLine("You picked number 3");
        break;
    }
  }

或

  var answer="";
  while(answer!="1" && answer!="2" && answer!="3")
  {
    Console.WriteLine("What do you want to do?");
    Console.WriteLine("1. Eat");
    Console.WriteLine("2. Drink");
    Console.WriteLine("3. Play");
    answer = Console.ReadLine();

    if (answer == "1")
    {
        Console.WriteLine("you picked number 1");
    }
    if (answer == "2")
    {
        Console.WriteLine("You picked number 2");
    }
    if (answer == "3")
    {
        Console.WriteLine("You picked number 3");
    }
  }

或

  var answer="";
  var validanswers = new [] {"1","2","3"};
  while(!validanswers.Contains(answer))
  {
    Console.WriteLine("What do you want to do?");
    Console.WriteLine("1. Eat");
    Console.WriteLine("2. Drink");
    Console.WriteLine("3. Play");
    answer = Console.ReadLine();

    if (answer == "1")
    {
        Console.WriteLine("you picked number 1");
    }
    if (answer == "2")
    {
        Console.WriteLine("You picked number 2");
    }
    if (answer == "3")
    {
        Console.WriteLine("You picked number 3");
    }
  }

Answer 2

类似的东西：

string answer = String.Empty;
do
{
    Console.WriteLine("What do you want to do?");
    Console.WriteLine("1. Eat");
    Console.WriteLine("2. Drink");
    Console.WriteLine("3. Play");
    answer = Console.ReadLine();
} while (answer != "1" && answer != "2" && answer != "3");

//handle answer here

继续询问，直到输入正确

2 个答案: