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c#loopswhile-loopinfinite-loopinfinite
Mavric
Mavric

Reputation: 25

C# While Infinite Loop

I'm still learning the fundamentals of C# and I'm currently busy with some code which has got me stuck in an infinite loop. 

   do
   {
        Console.Write("Please enter the Exam mark for student " + (index + 1) + ": ");
        Exam[index] = double.Parse(Console.ReadLine());

        Console.Write("Please enter the DP for student " + (index + 1) + ": ");
        DP[index] = double.Parse(Console.ReadLine());

        Final[index] = (DP[index] + Exam[index]) / 2;

            index++;
    } while (DP[index] != 999);

The code doesn't break when I type 999.

Upvotes: 2

Views: 1102

Answers (1)

Patrick Hofman
Patrick Hofman

Reputation: 156898

You increase the index with 1 just before the while condition is checked. I guess the value is 0 on that index...

A solution can be to remember the previous value in a variable, or subtract one from the index:

    } while (DP[index - 1] != 999);

Another problem might be the use of a double, since it is imprecise, it doesn't always match to 999 if you entered that value. If you can, use int or decimal.

Upvotes: 4

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