|
The
"switch" Statement
 |
If your
program must select from one of many different actions, the
"switch" structure will be more efficient than an
"if ..else..." structure. |
switch (expression)
{
case (expression 1): {
one or more C++ statements;
break;
}
case (expression 2): {
one or more C++ statements;
break;
}
case (expression 3): {
one or more C++ statements;
break;
}
.
.
.
default:
{
one or more C++ statements;
break;
}
} |
-
You MUST use a break statement after each "case" block to keep execution from "falling through" to the remaining case statements.
-
Only integer or character types may be used as control expressions in "switch" statements.
-
It is best to
place the most often used choices first to facilitate faster
execution.
-
While the
"default" is not required, it is recommended.
If you need to have several choices give the same response, you need to use
the following coding style:
switch (value)
{
case (1):
case (2):
case (3): {
//The case code for 1, 2, 3
break;
}
case (4):
case (5):
case (6): {
//The case code for 4, 5, 6
break;
}
default: {
//The code for other values
break;
}
}
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