What is the difference between pre and post increment and decrement operators?

Question

Pre and post increment and decrement operators are being a drag for me!

Answer 1

PRE ➡ Happens BEFORE end of statement

POST ➡ Happens AFTER end of statement

These apply for both ➕➕ and ➖➖.

Answer 2

++4 = 4
& 4++ =6

Answer 3

IN PREFIX ++x FIRST x IS INCREMENTED AND THAN EVALUATION TAKE PLACE.

IN POSTFIX x++ FIRST EVALUATION IS DONE AND THAN ITS VALUE IS INCREMENTED.

Decrement goes same way.

Hope this helps ☺️☺️.

Answer 4

Small example

x = x + x++ + ++x + x
=4
+ 4(post increment now x=5)
+ 6(pre increment)
+ 6.
=20

Answer 5

postfix: x=5 y=x++ so, x =6 y=5
if you ask why.. assign x value to y first
x=5 y=5
then increment
x=6 y=5
prefix
.. just add both first

Answer 6

pre increment increments the value by 1 before returning the value.
pre: a = ++1;
document.write(a); //2
post increment returns the value first then increments it.
post: a = 1++;
document.write(a); //1
Decrement works the same way as increments.