C++ Language/ProgramFlow/BreakStatement/FallthroughInSwitch
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A switch
statement is an efficient substitute for many if (x==1) {body} else if (x==5) {body} else if (x==99) {body}
chains.
In a switch
statement, each body is a sequence of statements preceded by a case 5:
label.
If you don't terminate that sequence of statements by break;
, then program flow will fall-through and also perform the next sequence of statements.
This is often a programming bug, so when you intentionally do this, write [[fallthrough]];
in place of break;
.
Additional information about fallthrough (includes interactive examples)