The default keyword is used to label the default branch in a switch statement.
A default block does not have an implicit ending point. A break statement is typically used at the end
of each case or default block to exit the switch statement upon completion of the block.
Without a default statement, a switch statement whose argument matches no case blocks will do
nothing.
Examples
int arg = ;
switch (arg)
{
case 1:
break;
case 2:
break;
default:
break;
}
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