Whole code:

public void shuffle()
{
Card[] newdeck=new Card[52];
bool[] assigned=new bool[52];
Random sourcegen=new Random();
for (int i=0;i<52;i++)
{
int destcard=0;
bool foundcard=false;
while (foundcard==false)
{
destcard=sourcegen.Next(52);
if (assigned[destcard]==false)
foundcard=true;
}

assigned[destcard]=true;
newdeck[destcard]=cards[i];

}
newdeck.CopyTo(cards,0);


what exactly next lines do:

for (int i=0;i<52;i++)
{
int destcard=0;
bool foundcard=false;
while (foundcard==false)
{
destcard=sourcegen.Next(52);
if (assigned[destcard]==false)
foundcard=true;
}

Especially this part is confusing:if (assigned[destCard] == false)

I have found alternative and more understanding code on this link:Chapter 10 Shuffle code page 266

The if statement is explained on page 73. This statement requires an expression that returns true or false. If it returns true, the next statement is invoked.

assigned is an array of Booleans. Arrays are explained on page 110. With the brackets the array implement an indexer. destCard is an int that is passed to the indexer of the array to access a single element.

The returned element of the array is compared to false with the == operator. The == operator is explained on page 60.

If the returned element from the assigned array returns false, the comparision false == false returns true, and thus the next statement is invoked.
If the returned element from the assigned array returns true, the comparision true == false returns false, and thus the next statement is not invoked.

Instead of writing
if (assigned[destcard] == false)

you can also write
if (!assigned[destcard])

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Thanks,now all is clear.

This piece of code also had me puzzled for a while, but for a different reason. You seemed to be comparing the value of unassigned array element value to another given value.

Looking on the Net I discovered that arrays of boolean type (at least those initialized by size only via the new keyword) store a default value of false for all its elements.

In this context, the logic of the code in this example then made sense.

Hope this helps someone.