Aim:
The pre-increment ++a incements the value of a before
the expression containing a is evaluated, the post-increment
a++ first increments a and then evaluates the containing 
expression.
Look at the code below. What will be the values of a, b, c and d? 
Print the values of a, b, c and d to verify your answer.
a = 5;
b = a++ + 3;
c = 5;
d = ++c + 3;
Your code starts after this line
print("b:", b, "a:", a);
print("d:", d, "c:", c);
> b: 8 a: 6 > d: 9 c: 6
Your code ends before this line