MESSAGE
| DATE | 2010-03-17 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] C++ Workshop - Switches and Break
|
_______________________________________________________________________________________________________
Switch Statement:
In addition to the if/else construction, C++ has a switch statement
which improves readablity of appropriate code. The basic format for
switch looks like this:
switch(expression that returns an int){
case int1:
statements;
statements;
statement;
break;
case int2:
statements;
statements;
statement;
break;
case int3:
statements;
statements;
statement;
break;
case int4:
statements;
statements;
statement;
break;
default:
statements;
statements;
statement;
}
There is a couple of caveats with the switch syntax. First, it is
really unlike any other C or C++ syntax. Be aware that the conditional
statement when is in the switch() syntax must return some from of an
integer, and on that note, recall that char are implicit integers. You
can not use a string as a return type.
The break at the end of each case block is necessary to stop the switch,
otherwise you code will check more than one case. You can have multiple
cases share the same statement block by constructing your switch like
this:
switch(expression that returns an int){
case int1:
statements;
statements;
statement;
break;
case int2:
case int3:
case int4:
statements;
statements;
statement;
break;
default:
statements;
statements;
statement;
}
With this structure, case int2, int3, and int4 all share the statement
block listed on case int3.
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