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The following switch statement pattern contains no break
statements. Thus, once execution begins, all subsequent statements up to
the end of the switch statement are executed.
switch (integer-producing expression) {
case integer constant 1: statements for integer 1
case integer constant 2: statements for integer 2
...
default: default statements
}
In general, when there is no break statement to terminate the
execution of a sequence of statements, execution is said to fall
through to the next sequence of statements, where execution continues,
once again, in search of a break statement.
The reason for the fall-through feature is that you occasionally want to
perform the same action in response to any of several conditions. Note
carefully, however, that an inadvertently forgotten break is a
common error.