Introduction to Game Programming: Using C# and Unity 3D

// The parameter x is passed by reference.
// Changes to x will affect the original value of x.
static void SquareIt(ref int x)
{
x *= x;
System.Console.WriteLine("The value inside the method: {0}", x);
}
static void Main(string[] args)
{
int n = 5;
System.Console.WriteLine("The value before calling the method: {0}", n);
SquareIt(ref n); // Passing the variable by reference.
System.Console.WriteLine("The value after calling the method: {0}", n);
System.Console.WriteLine("Press any key to exit.");
System.Console.ReadKey();
}

[access modifier] return-type method-name([parameter-type parameter-name[]]) { /* method-body */ }

access modifier] return-type method-name([parameter-type parameter-name[]]) { /* method-body */ }

for (int loopCount = 0; loopCount < 10; loopCount++)
{
// do something here ...
}

while(x<10)
{
// do something here ...
x++;
}
do
{
// do something here ...
x++;
} while (x < 10);
Code Block 5-loop structure samples

Program = Data + Algorithm
A program is like a recipe. It contains a list of variables that represent the data to be processed, and a list of directions, the algorithm(s) that perform special operations on the data.