fall-through

See also: fallthrough, and fall through

English

Alternative forms

• fallthrough

Etymology

Deverbal from fall through.

switch (x) {
case 1:
    printf("Printed when x=1");
    break;
case 2:
    printf("Printed when x=2");
case 3:
    printf("Printed when x=2 or x=3");
    break;
}

A case statement in the C programming language containing a fall-through. Because the second case has no "break" at the end, execution will "fall through" to the third case.

Noun

fall-through (countable and uncountable, plural fall-throughs)

1. (programming) In certain programming constructs, the situation where execution passes to the next condition in a list unless explicitly redirected.
   • 1997, Bjarne Stroustrup, The C++ Programming Language: Language Libraries and Design:

     It is a good idea to comment the (rare) cases in which a fall-through is intentional so that an uncommented fall-through can be assumed to be an error.

   • 2001, Graham M Seed, Barry J Cooper, An Introduction to Object-Oriented Programming in C++:

     If you place default elsewhere, then a break will be required to prevent fall-through.

   • 2008, Nagel et al, Professional C# 2008

     Specifically, it prohibits fall-through conditions in almost all cases.

Related terms

• flowthrough
• passthrough

 

Anagrams

• throughfall