(C) 's switch is behaving unpredictable. Can anyone Give me reason for this?

Question

#include <stdio.h>
int main() {
int s = 1;
switch (s){
case 1 :
printf("1");
case 2 :
printf("2");
case 3 :
printf("3");
}
return 0;
}
// copy it on your editor, you'll see its Printing "123".
// i dont understand why?? as, case 2 and case 3 isn't true.

Answer 1

This is due to fallthrough. In C, C++, Java, and a few other languages if the keyword break isn't used at the end of a case then the code will fallthrough to the next case and run its code as well. This will continue until a break statement or the end of the switch is reached.
https://www.sololearn.com/learning/2924/

Answer 2

Martin Taylor i have to say, you are so creative 😅

Answer 3

here in "case 2", 2 is referring to s, and s is actually 1.
similarly, in "case 3", 3 is referring to s, and s is actually 1.
then why its printing "123", i didn't use break, so what?? case 2 and case 3 isn't true after all.