Syntax

switch (expression) {
  case value1:
    //Statements executed when the
    //result of expression matches value1
    [break;]
  case value2:
    //Statements executed when the
    //result of expression matches value2
    [break;]
  ...
  case valueN:
    //Statements executed when the
    //result of expression matches valueN
    [break;]
  [default:
    //Statements executed when none of
    //the values match the value of the expression
    [break;]]
}

expression
An expression whose result is matched against each case clause.

case valueN Optional
A case clause used to match against expression. If the expression matches the specified valueN (which can be any expression), execution starts from the first statement after that case clause until either the end of the switch statement or the first encountered break.

default Optional
A default clause; if provided, this clause is executed if the value of expression doesn't match any of the case clauses. A switch statement can only have one default clause.