繼續詢問，直到輸入正確

-2

我試圖用3種不同的選項創建一個小遊戲，但我不確定如何在代碼中編寫此代碼：如果答案不是1,2或3，請繼續詢問直到輸入的問題是1,2或3。繼續詢問，直到輸入正確

 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.

來源

2015-10-22 Saluxx

你需要一個while循環 – pm100

奇怪你沒有找到這樣做的任何例子。可能使用的搜索引擎很糟糕 - 請嘗試使用[Google]（https://www.google.com/?gws_rd=ssl#q=C%23+Keep+asking+untill+input+is+correct） [必應]（https://www.bing.com/search?q=C%23+Keep+asking+untill+input+is+correct），然後再問問題。即使你不能立即得到答案，它也可能有助於說明你已經嘗試了什麼方法，以及爲什麼/如何不起作用。 –

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"); 
    } 
    }

來源

2015-10-22 17:03:15

我假設他將取代它來調用不同的功能，而這些只是佔位符。 –

喜歡的東西：

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

來源

2015-10-22 17:03:23

繼續詢問，直到輸入正確

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