Doubt (C language , question from challenges)

Question

What is the output?
#define sqr(x)x*x
int main(){
printf("%d",sqr(3+1));
}

Answer 1

Since define just copy and pastes, you have
3+1*3+1 = 3+3+1 = 7
Use
#define sqr(x) ((x)*(x))
to get the intendet behavior

Answer 2

Thankyou mimtelf

Answer 3

Oh, I didn't notice there are C challenges already 😱
That's nice 😅
You can report wrong answers, then other users won't encounter the same problem in the future hopefully^^

Answer 4

This question has the wrong answer (9) in the c challenge.