# C implements the shuffling algorithm

• 2021-01-06 00:42:37
• OfStack

C# shuffle algorithm, simple demonstration!

Algorithm 1.

``````
/// <summary>
///  Shuffle algorithm
/// </summary>
private void test()
{
int[] iCards = new int[54];
for (int i = 0; i < iCards.Length; i++)
{
iCards[i] = i + 1;
}
//
Random rand = new Random();
int iTarget = 0, iCardTemp = 0;
for (int i = 0; i < iCards.Length; i++)
{
iTarget = rand.Next(0, iCards.Length);
iCardTemp = iCards[i];
iCards[i] = iCards[iTarget];
iCards[iTarget] = iCardTemp;
}

for (int i = 0; i < iCards.Length; i++)
{
Response.Write(" The first " + (i + 1) + " Card is: " + iCards[i] + "<br/>");
}
}
``````

Algorithm 2.

``````
public void Shuffle()
{

int[] cards = new int[54] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53 };
// create 1 A temporary deck of playing cards
int[] newCards = new Card[54];
//bool An array variable
bool[] assigned = new bool[54];

Random sourceGen = new Random();
for (int i = 0; i < 54; i++)
{
int destCard = 0;     // Random number storage space
bool foundCard = false;
while (foundCard == false)
{
// generate 1 a 0 to 54 Between random numbers
destCard = sourceGen.Next(54);
if (assigned[destCard] == false)
{
foundCard = true;
}
}
assigned[destCard] = true;
newcards[destCard] = cards[i];
}``````

Algorithm 3.

``````
public void Reshuffle()
{
int[] cards = new int[54] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53 };
Random ram = new Random();
int currentIndex;
int tempValue;
for (int i = 0; i < 54; i++)
{
currentIndex = ram.Next(0, 54 - i);
tempValue = cards[currentIndex];
cards[currentIndex] = cards[53 - i];
cards[53 - i] = tempValue;
}
}

15``````

The third one is simpler and more efficient than the first one!

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