What is prefix and postfix?

Answer 1

adds 1 to variable
++x prefix
x++ postfix

example

prefix adds 1 to x then copy value to y

x=4
y=++x

//x=5 y=5

postfix copy x value to y then adds 1 to y

x=4
y=x++

//x=4 y=5

works with + - / *

Answer 2

operators are written before the operand is known as prefix.
eg. *AB(multiply A and B)

operators are written after the operand is known as postdoc.
eg. AB+(Add A, B)

Answer 3

There are increment operator (++) or decrement operator(--).
As you can see below:-
If you put increment operator before a variable.
e.g: ++a;
Then, it is an example of prefix.

Else, if you put increment operator after a variable .
e.g: a++;
Then, this will become an example of postfix.

NOTE: Same is for decrement operator(--) also.

Answer 4

prefix and postfix are unary operators in c++ when you write i++ in loop it is known as postfix notation and when you write ++i it is known as prefix notation eg:- for (int i=0;i <9;i++) it is(i++) is postfix notation and you can use them at other places also to increment decrement value of variables etc.