Card Shuffling in C#
A common programming exercise involves writing a card shuffling simulation in a given language. This question explores shuffling a deck of cards and querying the user for the number of shuffles.
Problem Statement
The provided code includes classes for a deck, card, and suit, along with a program to display the initial card order and take user input on the number of shuffles. The challenge lies in implementing the shuffling mechanism.
Solution
The Fisher-Yates shuffle, also known as the Knuth shuffle, is a widely used algorithm for shuffling an array in place. The updated code incorporates this algorithm:
static public class FisherYates<br>{</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">static Random r = new Random();
static public void Shuffle(Card[] deck)</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">{
for (int n = deck.Length - 1; n > 0; --n)
{
int k = r.Next(n+1);
Card temp = deck[n];
deck[n] = deck[k];
deck[k] = temp;
}
}}
This class defines a static method, Shuffle, which takes an array of cards as input. It then iterates through the deck in reverse order, selecting a random card to swap with the current card. By iterating over the entire deck, the algorithm ensures thorough mixing.
Implementation
To incorporate the shuffle into the original code, add a call to the Shuffle method in the Main method of the Program class after obtaining the number of shuffles from the user:
Deck myDeck = new Deck(); // Create a new deck<br>int numShuffles = Int32.Parse(Console.ReadLine()); // Read the user input on desired shuffles<br>FisherYates.Shuffle(myDeck.Cards); // Shuffle the deck the desired number of times<br>foreach (Card c in myDeck.Cards) // Print the shuffled deck<br>{</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">Console.WriteLine(c);}
Conclusion
Incorporating the Fisher-Yates shuffle algorithm allows for efficient shuffling of the card deck and satisfies the requirement of user-specified shuffle count. The code outputs the shuffled deck as requested.
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