Example of the C-++ Operator

I recently read "C language basics and Application Instances" and found interesting ++ operators. Let's take a look at the results of the following statements.
1

// What is the result? Guys :)
Main ()
{
IntI=3;
Printf ("% D, % d, % d \ n", I, I++, I++);
Scanf ("% D",&I );
}

2

// What about this one? :)
Main ()
{
IntI=3;
Printf ("% D, % d, % d \ n", I, I++,++I );
Scranf ("% D",&I );
}

3

// Also this one?
Main ()
{
IntI=3;
Printf ("% D, % d, % d \ n", I,++I,++I );
Scanf ("% D",&I );
}

Tip: In most C, the output of each printf parameter is from right to left.