Use fall-through to refer to an idiom where a multi-way branch statement (such as a switch statement in C) intentionally enters the next branch after completing the current one (falling through to the next case).
How would you use a switch case when you need to test for a or b in the same case?
switch (pageid) {
case "listing-page":
case "home-page":
alert("hello");
break;
case "details-page":
alert("goodbye");
break;
}
In the following piece of code, I use the standard [[fallthrough]] attribute from C++1z to document that a fallthrough is desired:
#include
int main() {
switch (0) {
case 0:
std::cout << "a\n";
…
I started learning Dart today, and I've come across something that my google skills are having trouble finding.
How do I have a fall-through in a non-empty case?
My use case is this: I'm writing a sprintf implementation (since dart doesn't have this…
currently in c#7 (version 15.3.4) following code is valid to compile but both variables are legitimately unusable.
switch(fruit)
{
case Apple apple:
case Orange orange:
// impossible to use apple or orange
break;
case Banana…
I was testing C++17 features on GCC compiler version 7.1.0.
This is related to the fallthrough attribute and the following example (live example) is adapted from online CPP reference here
#include "iostream"
using namespace std;
int f(int n) {
…
case "$action" in
a|b)
echo for a or b
;;&
b|c)
echo for c or b
;;&
*)
echo for everything ELSE
;;&
esac
So, as you can see, I'm using ;;& instead of ;; so that if action=b it will trigger both of the first two cases.
However, a…
Code sample:
int main(int argc, char **argv)
{
switch(argc)
{
case 0:
argc = 5;
__attribute__((fallthrough));
case 1:
break;
}
}
Using gcc 6.3.0, with -std=c11 only, this code gives a warning:
:…
We know that a Duff's device makes use of interlacing the structures of a fallthrough switch and a loop like:
send(to, from, count)
register short *to, *from;
register count;
{
register n = (count + 7) / 8;
switch (count % 8) {
case 0:…
I have the following code:
package main
import (
"fmt"
)
func main() {
switch {
case 1 == 1:
fmt.Println("1 == 1")
fallthrough
case 2 == 1:
fmt.Println("2 == 1")
}
}
Which prints both lines on the go…
The match in Rust only executes one arm. I found this code snippet from Murmurhash 3:
switch(len & 15)
{
case 15: k2 ^= ((uint64_t)tail[14]) << 48;
case 14: k2 ^= ((uint64_t)tail[13]) << 40;
case 13: k2 ^= ((uint64_t)tail[12]) << 32;
case…
Here the famous "fizz buzz" program in Go using switch/case and if/else conditionals. The problem is that using switch/case is generating unexpected output while if/else (with same conditions) works fine. I know that switch/case in golang is…
switch ($foo)
{
case 3 || 5:
bar();
break;
case 2:
apple();
break;
}
In the above code, is the first switch statement valid? I want it to call the function bar() if the value of $foo is…
This is not specifically a C# question but it is the C# version of switch that makes me ask the question.
Why do I have to explicitly state that I do not want to fall through from one case statement to the next instead of instead indicating when I…
A case falling through to the next case, may indicate an error, but sometimes it is intentional; if so, it is good practice to mark it so, for the benefit of both humans and the compiler.
The former can be done with a comment:
switch…
