Pre-increment and post increment the

Pre-increment

it means that first the value will increment by 1 and the store in variable. for example:-

x=5;

y=++x;

now what will be the value of x and y. the value of y will be 6 and also the value of x will be 6.

Post-increment

It means that first the value will be store(print) in variable and then update by 1. for Example:-

x=5;

y=x++;

now what will be the value of x and y. the value of y is 5 because it first store in variable y. after it the value is update and the value of x is 6.

To get the video of Pre-increment and post-increment please click the link given blow 

https://www.youtube.com/watch?v=IQzefD8FXgs&list=PLzzgUe_4aGJ7AyInNz4KVyfcd3qu4Jqr4&index=7