How can we use graphics.h header file in vs code

1. What is the output of the following printf printf("%d",34+24/12%3*5/2-4); answer with explanation

1. What is the output of the following printf printf("%d",34+24/12%3*5/2-4); answer with explanation

test.c: In function ‘main’: test.c:5:3: error: unknown type name ‘answer’ 5 | answer with explanation return 0; | ^~~~~~ test.c:5:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘attribute’ before ‘explanation’ 5 | answer with explanation return 0; | ^

1. What is the output of the following printf printf("%d",34+24/12%3*5/2-4); answer with explanation

https://en.cppreference.com/w/c/language/operator_precedence

oh well

Umm?

it's kinda useless because my exam got over

Sure, knowledge is completely useless after the exam

Hi. Is it possible to decode std::string so that universal character names encountered in it will be translated to corresponding symbols? For example "Hello, \\uD83C\\uDF0E.\" will become "Hello, 🌎."

hello guys i've in the same dirctory two cpp file (file1.cpp file2.cpp) both of them has an int main method. I would like to run file1.cpp that have to perform a certain task, but previous than that it has to execute file2.cpp. I'm make an unix app so is it fine to write something like this in file1.cpp: pid_t pid = fork(); if ( pid == 0 ){ system("./file2"); } else{ task1(); }

Hmmm doesn't printing out the string help?

Now, it just prints Hello, \uD83C\uDF0E.

How are you printing it out? And what is the type of your string?

std::cout «

First of all you have to make sure that the code points are valid. \uD83c is an invalid code point in both UTF-8 and UTF-16. So are you sure they are two different code points or is it a UTF-32 code point?

Why are you hell bent on naming all the functions main()? You asked a similar question yesterday if I remember correctly. Why can't you name the function as something else instead of main in file2.cpp and call that from the main function in file1.cpp?

Sure, knowledge is completely useless after the exam

When did this happen? When did admin change😳

Cause I’ve to use some function that is compiled with a specific make file and I’m getting some problem by replacing main with a function name

Easier example with 2byte symbol 中 (\u4e2d) also does not work. And the example with earth sign I verified on external decoder - it is valid (I can't share link due to chat rules).

Change the makefile? Spawning a new process all the time is also way more inefficient than just calling another function. Otherwise you need to create a new process and wait for it to terminate which works different on every platform.

It is not valid in UTF-16...neither in UTF-8 which is why I asked if you are using the right encoding. Here I am not talking about the Unicode standard. I am talking about the C++ standard. The problem is that the C++ standard specifies that \u accepts only code points and not code units. You are specifying a surrogate pair using \u specification which is specifically forbidden by the C++ standard. Unless you show me how you are encoding the string (meaning you show me the code), there is not much I can tell you. By default the values in a string are printed out assuming the local machine's encoding. Unless you specify the encoding correctly, the values printed out will not be meaningful. And also your terminal should be able to support the encoding used. Unless all of this happens, you will not be able to see the correct output that you expect.

For example, this is how I would print out the 🌎 symbol if I were using UTF-8

Thanks, by the way what is that IDE of yours?

how can i access a c++ class variable in another c++ file if my file doesn’t have a .h

You include that .cpp file though it's very bad thing to do

i tried that it crashed my whole code

how can i access a c++ class variable in another c++ file if my file doesn’t have a .h

i see, so what options do i have to access this variable? should i create a header file?

thats the only way?

does anyone know how to do fine grained locking? I have a queue of tasks and i need to lock them individually so that multiple threads can work on them at once

There are multiple ways you could do this. 1. Use a lock free queue 2. Have a queue but use only one thread to access it. This thread picks off a task one by one and passes it to a thread pool. This same thread will also handle pushing tasks into the queue. 3. Use a promise and a future and store the futures into the queue instead of each individual task itself. The promises can be handled by a thread pool executor service.

I see, say i have items within a queue and a customer wants to buy an item while a supplier wants to modify another item and another supplier wants to change the price of another item, would your tips work in this case as well? (#1 won’t work because i’m required to use locks)

all these threads should be able to work in parallel in the fine - grained mode

how the 'Hello world' is getting printed here : int main(){ string greet("Hello world"); char *char_array = &greet[0]; cout<<char_array<<"\n";// Hello world return 0; }

from char_array which is initialized from greet

char_array is storing address of first element of greet string . Then how ?

how the 'Hello world' is getting printed here : int main(){ string greet("Hello world"); char *char_array = &greet[0]; cout<<char_array<<"\n";// Hello world return 0; }

How this both cout prints same output ? char char_array_1[]={'H','e','l','l', 'o',' ', 'W','o','r','l','d','\0'}; cout<<char_array_1<<endl;// Hello world cout<<&char_array_1[0]<<endl; // Hello world

both have the same address

i suppose this work in that way

But in second cout statement , we just using first element of char_array_1, then how it is printing the whole char_array_1 ?