using System;
using System.Collections.Generic;
/*
A standard deck of 52 playing cards consists of four suits:
spades (♠), hearts (♥), diamonds (♦), and clubs (♣).
Each suit contains 13 ranks:
Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King.
Cards of spades and clubs are black, while hearts and diamonds are red.
Color is informational only — it does not affect shuffling or random selection.
*/
/*
This program picks 5 random cards from a standard 52‑card deck.
It uses:
- List<string> to store the deck
- Fisher–Yates shuffle for efficient randomization
- Random for high‑quality randomness
Algorithm:
1. Build the deck (52 strings).
2. Shuffle using Fisher–Yates.
3. Print the first 5 cards.
*/
class Program
{
// Build a full 52‑card deck
static List<string> BuildDeck()
{
string[] ranks = {
"2","3","4","5","6","7","8","9","10","J","Q","K","A"
};
string[] suits = {
"Clubs", "Diamonds", "Hearts", "Spades"
};
List<string> deck = new List<string>(52);
// Combine each rank with each suit → 52 unique cards
foreach (string suit in suits) {
foreach (string rank in ranks) {
deck.Add($"{rank} of {suit}");
}
}
return deck;
}
// Shuffle the deck using Fisher–Yates
static void ShuffleDeck(List<string> deck)
{
Random rng = new Random();
for (int i = deck.Count - 1; i > 0; i--) {
int j = rng.Next(i + 1);
string temp = deck[i];
deck[i] = deck[j];
deck[j] = temp;
}
}
static void Main()
{
// Step 1: Build the deck
List<string> deck = BuildDeck();
// Step 2: Shuffle the deck
ShuffleDeck(deck);
// Step 3: Draw the first 5 cards
Console.WriteLine("Your 5 random cards:");
for (int i = 0; i < 5; i++)
{
Console.WriteLine(deck[i]);
}
}
}
/*
run:
Your 5 random cards:
9 of Spades
J of Diamonds
A of Spades
5 of Diamonds
2 of Hearts
*/
