you can work on simple stuffs like a simple database or simple http server or a 2D video game (if you like doing game dev) basically anything you like, even if it’s seem complicated and advanced. you can start simple then improve your skills as you go until you finally make it

not considering virtual methods

If this stuff is simple, what now complex?

an almost 400 page long book called “database internals” that teaches you how make database management systems that are performant and really efficient like MySQL , PostgreSQL or Cassandra in addition to few research articles published by IBM and Intel about this topic

If this stuff is simple, what now complex?

.

for example a simple database for numbers let’s say each number would be 4 bytes simply write them to the disk then you got your self a database similar to Excel then maybe with GTK or QT create a program that create spreadsheets

If nothing virtual then no overhead, you define constructors and destructors yourself so you decide if they will do extra work or not

an almost 400 page long book called “database internals” that teaches you how make database management systems that are performant and really efficient like MySQL , PostgreSQL or Cassandra in addition to few research articles published by IBM and Intel about this topic

so no default constructors / the default has no overhead?

so no default constructors / the default has no overhead?

Okay

pretty cool

Good day! Sorry to ask. I'm just trying to learn a new topic. Namely, drawing graphs in C. And I can not understand that this requires a special program or C has a library for such purposes? I will be grateful for the answer

Hello guys, i found the code and i think it violates standards of c programming language. It pretty short. #include<stdio.h> main() { int *p, **q; printf("%u\n", sizeof(p)); printf("%u\n", sizeof(q)); } What do you think?

About what? It'll print the same values

Yeah, it works, but there's no space between include and stdio.h, main without data type. It is normally? I am just beginner in C.

Include is normal. Main probably return int by default. But it's bad style

Anyone wants to participate in a coding contest

Aicte certified coding contest

Hello guys, i found the code and i think it violates standards of c programming language. It pretty short. #include<stdio.h> main() { int *p, **q; printf("%u\n", sizeof(p)); printf("%u\n", sizeof(q)); } What do you think?

I don't understand and also why does it takes first student inputs correctly ?

A question that always occurs to me: what happens when two or more transactions are received at the same time, like which one will be chosen?

I was asked in an interview, say i need to create a new object of the concrete type to which the base pointer points to. How to do that ? I gave 2 obvious options of dynamic_cast and typeid but he said both will need if-else. Any one know of any other method ?

can anyone suggest a decent pointers tutorial where i can totaly understand the topic? it still could not sink in my mind tho i watched many videos

Jacob Sorber has an Ok and pretty simple tutorials about C on youtube (not promoting him) also there is one youtube channel called cherno about C++ But I have finished it the full series yet so I’m not sure about pointers but tbh (without the admin’s opinion influencing mine) the Resources in this group are pretty great so make sure to check them out especially book recommendations for C and C++ but you know books take time until you make peace with them especially when some of them tend to be written in a language that feels like reading a court case written by a lawyer in the 1950s but you will get used to them sooner or later

Need if-else for what?

if any transaction was issued it will be stored in a Write-Ahead storage (a separate file act as a stack) and changes will remain in memory until a certain number of transactions or some sort of checkpoint was reached then the changes will be commited in the main datafile pages (it is where data is stored and divided into 4KB or so “pages” to speed up disk IO) each transaction on the write-ahead storage has serial number so transactions are executed in order and you can do some optimisation where if two transaction modifying the same row/column (depending on the type of the database) the most recent that has a larger serial number will be commited to disk instead of modifying the disk twice

Nice How those changes are represented in the memory? Is it something like this? - Chane row number 1 to X - delete row number Y

usually it is implemented in an enum like this enum commands{ modify = 1, del_row = 2, add_row = 3, search = 4, ..,..,.. ..,..,.. }; and stored in a binary format take this as an example [LSN] [add_row] [database name length] [database name] [table name length] [table length] [value length] [value] [row index] note that row index might look different depending on the database type paradigm whether you will search for the key or you know the position of the row so you can access it directly later

Nice How those changes are represented in the memory? Is it something like this? - Chane row number 1 to X - delete row number Y

LSN stands for Log Serial Number which is the serial number of the write-ahead log that I told you about to determine the order that the database will commit transactions to the main storgae on disk

also I forgot that a timestamp is also used instead of LSN sometimes (depending on the implementation)

Okay Thanks Hussein

you’re welcome there is a book called “database internals” that explains the details of this topic you can read it (legally or pirated😈) which I think might help you understand this even better

I'm having hard times understanding advanced recursive problems like permutations of a string, what should I do to get better in recursion?

I'm having hard times understanding advanced recursive problems like permutations of a string, what should I do to get better in recursion?

try to make a recursive function yourself in Python or lua or javascript then do it in C or C+¥

Include is normal. Main probably return int by default. But it's bad style

Why making main return 0 by default a bad style?

Why making main return 0 by default a bad style?

Why making main return 0 by default a bad style?

I just wanted to know that can we use switch statement for multiple cases or just a few

you can add as many cases as you want

When main reaches the end of flow of control without a return statement, it'll return 0. It's a common knowledge so I personally disagree it'll lead to any problem without explicit return.

Unfortunately main function is exception from others functions and don't follow common standard. I always force compiler to interpret warning (non void function doesn't return value) as error. Developer always should take care what does function return.

However, main return 0 by default is common knowledge

You can read books about functional programming, they will help you to better understand some functional design patterns including recursion.

C++ IO might have a different buffer for cin from C which uses stdin ( AKA each language implemented its own IO buffer caching so maybe because stdin never gets flushed while cin always flush its own input buffer correctly ) so you should either code in C or C++ ( or disagree with everyone here and try fflush( stdin ) after gets() like C programming legend who hates C++ style but has to use it 😎😇🤐 ) btw in C you should use fgets() for simple unformated console input and forget about gets() because it’s buggy and unsafe plus no compiler expect you to use it in the next million years