we need a note for that

Lol

Damn

oh so there is a "note"

Press F to pay respects, lol.

F

F

So back to the array issue if you need something you can dynamically size look at std::vector.

Welcome

So back to the array issue if you need something you can dynamically size look at std::vector.

He is using C, vectors are C++ only

Any website for C manual ? Definition and catogarised libraries.

He is using C, vectors are C++ only

Or she, idk

Ah, then yeah.

Hello, is there anyone among us who used the book Cryptography in C and C ++ by Michael Welschenbach? I started getting interested in the field of cryptotechnology, I am asking because of that.

#include<stdio.h> void main( ){ Int size = 5 ; Int array1[size] = {1,3,5,6,7}; } Run or not

if you're statically initializing anything, skip the size spec altogether. this will allow you to 1) change only the static initialization list, if necessary and 2) avoid needlessly keeping track of a separate, static, variable, for that size

because 2.1) you can determine that size both during compile-time (sizeof()) and runtime

Hello, is there anyone among us who used the book Cryptography in C and C ++ by Michael Welschenbach? I started getting interested in the field of cryptotechnology, I am asking because of that.

what's your background in cryptography?

what's your background in cryptography?

Completely new

i suggest you grab this instead then: https://www.amazon.de/-/en/Jean-Philippe-Aumasson/dp/1593278268/

i suggest you grab this instead then: https://www.amazon.de/-/en/Jean-Philippe-Aumasson/dp/1593278268/

Could you also say your reason for suggestion? I mean that the one you suggested is more friendly for newbies or it starts from very basics?

yeah, so, that'll introduce you (briefly) to the history and evolution of the field, explain and introduce you to the concept of 'security' in computing and transmission, introduce you to fundamental concepts of cryptography like algorithm design, algorithm evaluation, attacker models and a bunch more

Could you also say your reason for suggestion? I mean that the one you suggested is more friendly for newbies or it starts from very basics?

This practical guide to modern encryption breaks down the fundamental mathematical concepts at the heart of cryptography without shying away from meaty discussions of how they work. You’ll learn about authenticated encryption, secure randomness, hash functions, block ciphers, and public-key techniques such as RSA and elliptic curve cryptography. You’ll also learn: - Key concepts in cryptography, such as computational security, attacker models, and forward secrecy - The strengths and limitations of the TLS protocol behind HTTPS secure websites - Quantum computation and post-quantum cryptography - About various vulnerabilities by examining numerous code examples and use cases - How to choose the best algorithm or protocol and ask vendors the right questions Each chapter includes a discussion of common implementation mistakes using real-world examples and details what could go wrong and how to avoid these pitfalls. Whether you’re a seasoned practitioner or a beginner looking to dive into the field, Serious Cryptography will provide a complete survey of modern encryption and its applications.

that's what the amazon description says, and yes, it does fall to that description, but i found it great at establishing the topic subjects and introduction

i have a paperback copy of it on my shelf. its a nice read on a sunny weekend afternoon

Ooh, I might get myself a copy..

Thanks a lot for detailed explanation. I really appreciated for that

type name[size]={intailizers} example: int array[5]={1,2,3,4,5} or array[5]={0,1,2,3,4} Do not do the following: int array[5]={1,2,3,4,.5,6} going out of bounds may or may nor produce a compile error, but it -will- produce a insta-terminate of your program once you try to access the out of bound element.

If you really want a strict compiler use -pedantic anything at all the compiler detects against ISO will become an error.

Which reminds me now that I'm done prototyping my resource management system I need to turn that back on.

Thanks a lot for detailed explanation. I really appreciated for that

He copy and pasted the book description ;)

He copy and pasted the book description ;)

Hmm, but he don’t have to do that :P

Missing array type

yeah

It does work, just the int a = 5 is not nessicary, just use 5 in the [] save memory and save your self headaches later.

int a = 5 should be const int a = 5

Other wise you could resize the array accidentally which is illegal in C

std::vector can resize arrays (I think)

That too, but that whole line is really not needed. :/

That too, but that whole line is really not needed. :/

Unless it asked for user input

But ONLY in that case

That too, but that whole line is really not needed. :/

No literally that - It will not compile unless you add a const keyword.

std::vector<int> a; a.resize(5);

Cool

No literally that - It will not compile unless you add a const keyword.

Wait yeah, I forgot about that not comipling in pure C.

Oh side note while making multi dimensional arrays works fine, do not use multidimensional vectors, too easy to setup undefined behaivor.

Idk about that, learning C++ rn

I just got through debugging a friend's code, and every single one of his multi dimensional vectors forced sig trap in GDB.

Damn

Big rip

I recoded each one as a multi dimensional array of a fixed set of dimensions, purred like a kitten with a 0x0 exit status.

may be a compiler extension that allows that hence the need to use -pedantic

gcc in particular is famous for having non standard extensions for convenience, although MSVC/++ isn't much better.

I recoded each one as a multi dimensional array of a fixed set of dimensions, purred like a kitten with a 0x0 exit status.

👌

There ya go, you may want to avoid those, I'm still learning some things but extensions made me want to rip my hair out when people kept saying that my examples were invalid when I was asking newbish questions.

-nostdlib xD

If you code outside standard it will possibly cuase other compilers to fail. You also prolly should tell it to use only standards as it will force you to learn the sandards

also nostdlib will cause it not to import the template library.

also nostdlib will cause it not to import the template library.

Ik

He may not though.

Hence the xD. I use -nostdlib in my kernel

He may not though.

It is self explanatory enough

Hence the xD. I use -nostdlib in my kernel

👍

Just doing a little research on the multidimensional vector thing, seems that if you set up a vector within a vector it's limited to the overall size of the first vector. So multidimensional vectors are technically pointless.

++i = 10; unlike C, why is this L-value expression in C++?

so if x =0 an i =1, if you then set x= ++i x now =2 and i now = 2 if you set x = i++ x now =2 and i=1

Now in the case of the statement ++i; or i++; there is no difference.

Now in the case of the statement ++i; or i++; there is no difference.

++variable and variable++ aren't the same

it only effects it if you are using it in the same statement with an operator such as =, ==, < , > , <=, >=,

in solo they both just increnet the varbile

in solo they both just increnet the varbile

Yeah

Only matters in loops

so the statement ++i; and i++; again with out an operator are the same. XD

:)

either way it's just a short cut for either +1 or +1 and store value.

so the statement ++i; and i++; again with out an operator are the same. XD

If the copy isn't used compiler will optimize i++ to be ++i

Interesting

Makes sense really since with out an operator the default behavior is +=1.

Makes sense really since with out an operator the default behavior is +=1.

I really know nothing about C compilation

I should learn more about how gcc works...

Or in some cases doesn't read some of Linus Torvalds comments on that topic.