Its ouput is 3 3 1 , but why ?

Question

int main(){
int a = 1 ;
printf ( "%d %d %d", a, ++a, a++ ) ;
return 0;

Answer 1

It can be, that those arguments are passed in "from right to left" order.

Answer 2

The execution process always start from right to left.....
That's why. ...☺☺