The switch statement is used to perform different action based on different conditions.
Use the switch statement to select one of many blocks of code to be executed.
This is how it works: First we have a single expression n (most often a variable), that is evaluated once. The value of the expression is then compared with the values for each case in the structure. If there is a match, the block of code associated with that case is executed. Use break to prevent the code from running into the next case automatically.
The default Keyword
Use the default keyword to specify what to do if there is no match: