C# 2010 All-In-One For Dummies

C# Operators and Precedence

It’s not always easy to determine which C# operators take precedence over others. The following table offers a list of common C# operators and their precedence, along with their cardinality and associativity.

C# Integer Variable Types

C# integer variables come in a variety of types and ranges. The following table sorts out the C# integer variables so you’ll always know the range and size of each.

C# Floating Point Variable Types

C# floating point variables come in two types: float and double. The following table compares these two types in terms of size, range, and accuracy.

Other C# Variable Types

It’s not always easy to sort out C#’s variables. The following table offers a comparison of all C# variable types except integer and floating point, which are covered elsewhere.

Controlling Program Flow in C#

The following code segment depicts the great variety of ways in which program flow can be re-routed in C#, including if-else structures, while loops, and for/foreach loops.

if (i < 10)
{
  // go here if i is less than 10
}
else
{
  // go here otherwise
}
while(i < 10)
{
  // keep looping through here as long as i is less than 10
}
for(int i = 0; i < 10; i++)
{
    // loop 10 times
}
foreach(MyClass mc in myCollection)
{
  // ... execute once for each mc object in myCollection
}

Defining a Class in C#

In C#, as in most object-oriented programming languages, a class is a bundling of unlike data and functions that logically belong together into one tidy package. Good classes are designed to represent concepts. Classes are central to C# programming. In broad terms, here is how you define a class in C#:

 [access][<abstract | sealed>]class MyClassName [: [BaseClass] [, Interface, ...]]
{
  [static][access]type dataMember;
  [<static|virtual|abstract|new|override>][access]type method(. . . args . . .)
}
for classes, access is public|protected|internal|private
  for class members, access can also be protected internal

Notes: