Stop program from running when pressed different keys from the statement

Question

1.00/5 (2 votes)

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I have this trivia game simmilar to Who wants to be a millionare on the console.

There are 8 options, A,B,C,D which represent the answers and 1,2,3,4. which represent the help options.

I identify the key pressed with this(example):

C#

string key_pressed = Console.ReadLine().ToUpper();
if (key_pressed.Equals("A"))
{
 //code here
}
else if (key_pressed.Equals("B"))
{
 //code here
}

My problem is when the user presses a diferent key from those 8. The program incresses automatically by another level(changes question). How do I fix this?

edit1.

And I have a else block limiting the statements:

C#

else
               {
                   Console.WriteLine("You need to inser a valid key.");
                   continue;
               }

Posted 27-Dec-13 6:04am

Member 10490707

Updated 27-Dec-13 6:11am

v3

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Comments

bowlturner 27-Dec-13 12:11pm

What is in your last 'else' statement? I think we need a little more code displayed.

2 solutions

Solution 1

Without seeing the rest of your code, we can't really comment on it! But...
The way I would do it is to create a method which returns a "valid key":

C#

private char GetValidKey(string validChars)
    {
    while (true)
        {
        string key = Console.ReadLine().ToUpper();
        if (key.Length > 0)
            {
            char c = key[0];
            if (validChars.Contains(c))
                {
                return c;
                }
            }
        }
    }

Then all you have to do is pass the valid date in:

C#

char c = GetValidKey("ABCD1234");

Posted 27-Dec-13 6:11am

OriginalGriff

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Member 10490707 · Accepted Answer · 2013-12-27T06:28:00

I added a while loop so now the code doesn't advance.

C#

string key_pressed="";
while(key_pressed=="")
{
  key_pressed = Console.ReadLine().ToUpper();
  if (key_pressed.Equals("A"))
  {
     //code here
  }
  else if (key_pressed.Equals("B"))
  {
    //code here
  }
  // else-if cases for C and D
  else
  {
    // code for the "wrong key" case. Beep, perhaps.
    key_pressed=""; // so the loop continues
  }
} // end of while loop