while loop exit, without well-known way

Question

I just asked a same question, but the question is closed, maybe I broke the rules...or mess.

anyway i know about loop exit like break, while(bool), return, n=1, n=0 while(n), I want another method other than the above one.

i solved this problem with while(mode!=2) thanks for all, to answer my immature question :) i promise hard study by foundation your feedback!

question is closed.

here's my code structure :) ↓

        
#include<stdio.h>
#include<stdlib.h>
#include<windows.h>

int main() {
    
    int  mode=1;
    while (mode != 2)
    {
        printf("\ninput: "); scanf("%d", &mode);
        switch (mode) 
        {
        case 1: printf("\none"); Sleep(1500); break;
        case 2:
            printf("\nsomething");
            Sleep(1500);
            break;

        default: printf("\nStackOverFlow");  break;
        }
    }
    return 0;
}

Using a boolean state variable instead of a hard-coded infinite loop, is a common way to solve this problem. If it's used as part of the loop condition, or as a separate condition for a `break`, doesn't really matter and depends more on your use-case. — Some programmer dude, Feb 21 '23 at 07:00
The problem you're running into is that a `break` at that point refers to the enclosing `switch` statement, not to the `while` loop that contains it. C has no multi-level `break`. — Keith Thompson, Feb 21 '23 at 07:05
What problem are you trying to solve? What do you need that `break`, `return` and loop conditions lack? — Caleb, Feb 21 '23 at 07:14
Does this answer your question? [How to break out of nested loops?](https://stackoverflow.com/questions/9695902/how-to-break-out-of-nested-loops) — nielsen, Feb 21 '23 at 07:26
Editing the code in the question after it has received answers/comments invalidates them. And your newfound solution can not work. — Harith, Feb 21 '23 at 09:43
I edit my code to work now, and as you know scanf is work when SDL check, off condtion for safety. — REDALOE, Feb 21 '23 at 14:46
I just noticed that I confused the case with the mode variable that I originally had to enter. — REDALOE, Feb 21 '23 at 14:56

Harith · Accepted Answer · 2023-02-21T09:43:55.793

Use `goto`:

This will only exit the while loop.

while (true) { 
    ...
    if (some condition) {
        goto CLEANUP;
    }
    ...
}
CLEANUP:
...

`exit()` the program:

while (true) {
    ...
    if (some condition) {
       exit (EXIT_FAILURE);
       
       /* OR, if in the `main()` function: */
       return EXIT_FAILURE;
    }
    ....
}

`abort()` the program:

while (true) { 
    ...
    if (some condition) {
        abort ();
    }
    ...
}

Some other alternatives, that will do much more than just exit the while loop, include:

The raise() function.
The quick_exit() function.
The _Exit() function.
The _exit function. (Note that this is not defined in the C standard, it is a POSIX extension)

while loop exit, without well-known way

1 Answers1

Use goto:

exit() the program:

abort() the program:

Use `goto`:

`exit()` the program:

`abort()` the program: