What is the main defferences??

Question

#include <stdio.h>
int main() {
int x,y;
x = 10,20,30;
printf("%d\n", x);
y=(10,20,30);
printf("%d",y);
return 0;
}
OUTPUT:
10
30

Answer 1

Read this to understand what comma operator is, when comma token in code acts as separator and when it acts as operator.
https://sillycodes.com/comma-operator-in-c-programming/

Answer 2

Output is
10
30
Not 30 10 (may be typo mistake!!)