how can i have the size of array

#define SIZEOF_ARRAY(x) ((sizeof(x)/sizeof(0[x])) / ((size_t)(!(sizeof(x) % sizeof(0[x])))))

Hi guys. Is there any way to find an start index of subarray within another array using any standard functions? byte* arr1 = new byte[n] { 1, 2, 3, 4 } byte* arr2 = new byte[m] { 3, 4 } => index == 2

#define SIZEOF_ARRAY(x) ((sizeof(x)/sizeof(0[x])) / ((size_t)(!(sizeof(x) % sizeof(0[x])))))

What on earth is this horrifying macro?

welcome to windows api

Ain't it #define ARRSIZE(x) (sizeof(x) / sizeof(*x)) ?

Hi, can anyone help me with this code? When I get the output, I got an unexpected letter after joining the string. https://pastebin.ubuntu.com/p/bf5kbPcJdT/

I have placed /0

You didn't

:( Can you please let me know where I have to put that?

(C) I have a string entered from the keyboard. How to find numbers among all words? I created pointer ptr and devided my string every time with function strtok(). Then I tried to use functions like isdigit() for each "word" and after that use atoi() if isdigit() works. However, it converts everything into number, no matter what it is - a word or real number. What should I do?...

What on earth is this horrifying macro?

You can use try this https://www.boost.org/doc/libs/1_75_0/libs/algorithm/doc/html/the_boost_algorithm_library/Searching/KnuthMorrisPratt.html

Thanks

Or this https://en.cppreference.com/w/cpp/algorithm/find_first_of If boost is not available

Hello

How to find maximum and minimum in loops ?

Ain't it #define ARRSIZE(x) (sizeof(x) / sizeof(*x)) ?

How to find maximum and minimum in loops ?

Is anyone here who know full c language?

No one knows C at all

Hello every one I need c++ practice example please if any one have share it thank u

Or this https://en.cppreference.com/w/cpp/algorithm/find_first_of If boost is not available

With c programming plz!

I have a problem here can not solve it tried many times

Does C/C++ have function for add int (4Byte) to long long (8Byte)?

cast the int to long long int a = 1; long long b = 1; b += (long long) a

But what about long double + int?

you just cast the int

I know but what the exactly compiler do

there are specific CPU instruction for casting, so the compiler uses them The result depends on the CPU architecture

What about x86_64

there are a lot of CVT- instruction, go and see the instruction set CVT = convert They were mostly added with the SSE extentions https://en.wikipedia.org/wiki/X86_instruction_listings#Added_with_SSE

But do you know what is a best way if I need to iterate from end to start during the search? I assume that it can be done using reverse_iterator but I'm not sure that it will work

What do you mean "to iterate from back start" ? Do you need to find sub sequence but in reverse? Try rend and rbegin in that case

yes. I need to do something like std::find_last_of ... but I have no begin and end because it just a pointers. And I wondering does there have some wrapper for pointers to make reveres iterator without implementing custom one

you're asking how to use the function @andrew1923

That depends on your pointers and structure that your elements are stored in. If it's an array or a vector you can calculate distances between pointers of it's something else depends on this something else.

thanks. I just use std::reverse_iterator

if i created a mutex variable //mutex variable creation pthread_mutex_t var; pthread_mutex_init( &var, NULL); //thread creation pthread_t th; pthread_create(&th , NULL,function,0); how the mutex variables is connected to the thread?

if i created a mutex variable //mutex variable creation pthread_mutex_t var; pthread_mutex_init( &var, NULL); //thread creation pthread_t th; pthread_create(&th , NULL,function,0); how the mutex variables is connected to the thread?

Mutex are not connected to threads. They guard resources that you want to access from threads. Each thread that wants to, for example, write to a variable takes mutex before writing. Several different threads can't take the same mutex

and create a mutex for each thread, it doesnt matter the order, just that each thread has its own mutex