what is prefix and postfix ?

Question

Difference b/w x++ & ++x

Answer 1

prefix first increases the value of x by 1 then puts it as the value of x.
and postfix first puts the value of x in the statements then increases it by 1.

Answer 2

its like preworkout & postworkout
pre= ++x
post means after the x
its x++

Answer 3

x++: access x then increase it
++x: increase x then access it