Statements - Illustrated C# 2005 - page 215

The switch Statement
The switch statement implements multi-way branching. The syntax and structure of the
switch statement are shown in Figure 9-3.

￿The switch statement contains zero or more switch sections .

￿Each switch section starts with one or more switch labels .

Figure 9-3. Structure of a switch statement

Switch labels have the following form:

case ConstantExpression :
↑ ↑
Keyword Switch label terminator

The flow of control through the structure in Figure 9-3 is the following:

Test expression TestExpr is evaluated at the top of the construct. ￿

If the value of TestExpr is equal to the value ConstExpr1 , the constant expression in the
first switch label, then the statements in the statement list following the switch label are
executed, until the break statement is encountered.

￿

Each switch section must end with a break statement (or a goto statement, as discussed
later).

￿

￿The break statement branches execution to the end of the switch statement.

￿The default case is optional.