What syntax is this?

Question

Why is the output the last element? What is this syntax and what does it mean? First time I saw this xD

https://code.sololearn.com/c1T3Ez1B679t/?ref=app

Answer 1

The comma operator does all the expressions in order and then returns the last one. You know, like in

a = 4, b = 5;

The above line also happens to return `5`. It's just code that is meant to look confusing.

Answer 2

Schindlabua oh yeah I get it now! Damn thats strange because this actually works:

int main() {
int a, b;
int c = (a = 1, b = 2);
printf("%d %d %d", a, b, c);
return 0;
}

// Output: 1 2 2