Prime sieve error

sir i am doing the same as taught by sir in the video but it is showing declaration error in
#define ll long long ;
please also explain how are we defining long long in ll and is it typecasting or what ?

link of code : https://ide.codingblocks.com/s/469881

hello @tejuschaturvedi0

check now->

please read about macros in c++.

I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.

On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.