while(true){ if(cin >> num) cout << num; if(cin.eof()) break; if(MAX_INT || MIN_INT) cout << "invali input, try again\n"; } ============ How do I correctly define the second and third condition? If I do 'ctrl + d' or eof, it will exit the loop. If I'm an unsuitable number for int, it will detect and alert In the second and third condition, which will identify the "cin" of the first condition

while(true){ if(cin >> num) cout << num; if(cin.eof()) break; if(MAX_INT || MIN_INT) cout << "invali input, try again\n"; } ============ How do I correctly define the second and third condition? If I do 'ctrl + d' or eof, it will exit the loop. If I'm an unsuitable number for int, it will detect and alert In the second and third condition, which will identify the "cin" of the first condition

Full code ? So we can find .

Base task Create a function named cartesian1() which produces the Cartesian product of sets. The sets are represented by arrays, The Cartesian product of sets A and B is the set of all pairs where the irst component comes from A and the second one comes from B: A⨯B = { (a,b) | a∊A ∧ b∊B }. For example for sets {1,2} and {4,5} the Cartesian product is {(1,4), (1,5), (2,4), (2,5)}. The function should have two input and one output parameter: the input parameters should be 10 element integer arrays, and the output parameter is a 100 element array containing pair objects. pair type is a record which contains two integers. You may assume that the input array elements are unique. Create three arrays in main() function with correct sizes and call the function. Test your program by printing the result.

Guys I need really help. I'll appreciate it

What kind of help you need?

while(true){ if(cin >> num) cout << num; if(cin.eof()) break; if(MAX_INT || MIN_INT) cout << "invali input, try again\n"; } ============ How do I correctly define the second and third condition? If I do 'ctrl + d' or eof, it will exit the loop. If I'm an unsuitable number for int, it will detect and alert In the second and third condition, which will identify the "cin" of the first condition

i need solution of task

I am afraid you won't get this kind of cheating help here

no i did task . maybe can you check my code

Hello, does any know how to enable module support using import keyword for C++20, gcc compiler (v12.1) in codeblocks? When trying to build my project, I keep getting the error message, "import only available with -fmodules-ts."

Set compiler flags

In the compiler settings, I don't see the option for selecting c++20 or -fmodules-ts support.

Manually set compiler flags

For example -fno-pie isn't available on the option

while(true){ if(cin >> num) cout << num; if(cin.eof()) break; if(MAX_INT || MIN_INT) cout << "invali input, try again\n"; } ============ How do I correctly define the second and third condition? If I do 'ctrl + d' or eof, it will exit the loop. If I'm an unsuitable number for int, it will detect and alert In the second and third condition, which will identify the "cin" of the first condition

while(true){ if(cin >> num) cout << num << endl; else if (cin.eof()){ cin.clear(); break; } else { cout << "Invalid Input" << endl; cin.clear(); } }

I added -fmodules-ts to other compiler options under the compiler settings and now I get the error message, "failed to compile module, no such file directory." I am running a simple hello world program which includes the import <iostream> directive only.

Ctrl+d is print "invalid..." in loop. not break.

The support for standard libraries importing as modules in GCC is still lacking. There is a meta bug related to this : https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99227 Follow the instructions there

Maybe on your system Ctrl+C or Ctrl+Z is EOF and not Ctrl+D

and why is loops? There cin.clear(). Need read new input

Didn't get you...can you clarify your question?

When set ctrl+d, is print: invalid... Invalid.... Invalid.... Invalid.... When input INT_MAX is print only one time. Loops.

When you input a number greater than INT_MAX, cin.fail() will be set and that should print Invalid Input

But cin.clear not stop the print

cin.clear is not for clearing cin buffer. It is for clearing the error flags and restore cin to a valid state for further inputs.

So what I need?

I don't understand. In your original question, you wanted to print Invalid Input if user enters a value out of range. Is the code that I gave not doing that?

no. 1. If get 'a', is break, not print "invalid". 2. If print "invalid", is print in loop. (Invalid, invalid, invalid....).

1 my mistake, sory

Check your code again to see if it matches this code. If you don't call cin.clear() in the else condition, it will loop infinitely because cin cant accept any input if it is in error state. Maybe that is why you are seeing "Invalid Input" printed in a loop. https://t.me/programminginc/454556

Yes, is was mistake. But 2 is loop infinity.

I showed you the output from Rextester bot. It is not looping infinitely.

Indeed, I saw. It's weird for me. But thanks so far. I think I bothered you enough...

For the input /stdin -2 5 10 1000000000000 6 7, this is the output. I can't simulate EOF on Rextester

EOF is there implicitly, isn't it?

To my understanding EOF is not a symbol, it is just the fact that the file has ended

To my understanding EOF is not a symbol, it is just the fact that the file has ended

On a real system, where you are reading from stdin (without redirecting input), you can't simulate EOF unless you enter the OS designated EOF character. So I thought Rextester would have the same issue as well. But you are right. Rextester assumes EOF after the last input possibly because it treats the input as a file.

no... no

Try this code on your system int main(){ int num; while(cin>>num); } It will wait for an input until it encounters an invalid input or if you enter the designated EOF character.

i don't agree... there is no such EOF character

When set ctrl+d, is print: invalid... Invalid.... Invalid.... Invalid.... When input INT_MAX is print only one time. Loops.

Is there any library to add command line options easily to a C++ program?

if you have a file, you don't have "EOF" character at the end of the file

Is there any library to add command line options easily to a C++ program?

Read again what I said. I am talking about input from the terminal and not from a file. I never said there is a EOF character at the end of a file. The EOF is sent when the file marker reaches the end. This EoF is not present in the file. The kernel can automatically send this when it detects that file read has reached the end For terminal input, you have to specify EOF using a OS designated Ctrl+<> key combination. This must be done manually because a kernel can't detect this case. It is true that the terminal driver handles this key combination and then signals the kernel saying end of input is reached. The kernel interprets this and sends a specific return value to the read system call made after the end of input. This is then changed into the EOF macro that C uses. In the case of a read call on a file, there is no interrupt mechanism required to signal end if input as the kernel knows when the file end is reached and it repeats exactly the same process it did for the terminal (minus the manually sending the EoF part). EOF is not a C specification btw but is infact a POSIX specification.

Read again what I said. I am talking about input from the terminal and not from a file. I never said there is a EOF character at the end of a file. The EOF is sent when the file marker reaches the end. This EoF is not present in the file. The kernel can automatically send this when it detects that file read has reached the end For terminal input, you have to specify EOF using a OS designated Ctrl+<> key combination. This must be done manually because a kernel can't detect this case. It is true that the terminal driver handles this key combination and then signals the kernel saying end of input is reached. The kernel interprets this and sends a specific return value to the read system call made after the end of input. This is then changed into the EOF macro that C uses. In the case of a read call on a file, there is no interrupt mechanism required to signal end if input as the kernel knows when the file end is reached and it repeats exactly the same process it did for the terminal (minus the manually sending the EoF part). EOF is not a C specification btw but is infact a POSIX specification.

Well what I am saying that input from a terminal or input from a file is the same. Both of these mechanism use the same syscall (at least in Linux). And the terminal shortcut for sending EOF is not OS designated, that depends just on the terminal settings. Also there is nothing for kernel to "detect" in this case.

They are the same with respect to the fact that Unix systems treat them as files underneath. But the behavior is different. The read system call is the same (this is obvously so because POSIX aims to provide a common interface to all devices) but the underlying implementation is different. The actual driver calls made by these system calls differ in the case of a file being read from the file system and a read from the terminal. I am pointing to Linux source code here. I guess other OSes would do something similar as well. I haven't gone through them. Here is the definition for system call read - https://elixir.bootlin.com/linux/latest/source/fs/read_write.c#L609 This ends up calling this function: https://elixir.bootlin.com/linux/latest/source/fs/read_write.c#L462 This is a function in the virtual file system function that Linux set up for providing a filesystem interface for user space programs. From here the call is diverted to a read call specific to the file being read. This is where Linux diverts the read to the actual device drivers. Here is the corresponding line of code: https://elixir.bootlin.com/linux/latest/source/fs/read_write.c#L479 To see how the read variable is set up you can look at the code here : https://elixir.bootlin.com/linux/latest/source/fs/open.c#L1005 and https://elixir.bootlin.com/linux/latest/source/fs/open.c#L1197 and https://elixir.bootlin.com/linux/latest/source/fs/namei.c#L3628 and https://elixir.bootlin.com/linux/latest/source/fs/namei.c#L3589 This is where open files are populated in task struct corresponding to your process or in simpler cases like being discussed here (it is copied from our parent process). You can see how the settings for a terminal and for files opened point to different functions. Now look at the man page for sys call read. The system call is supposed to return 0 in the cases where a read call is made after end of file is reached and errno must not be set for this case. How is the kernel supposed to know this? How does the tty driver inform the kernel about this? The driver handles the Ctrl+<> signal from us and then informs the kernel that end of file is reached. This is what the kernel uses to signal the C standard library or the C++ standard library. The part where the EoF is handled is different for reads from the terminal and reads from a regular file.

Anyone help me Restaurant management systems report for Final Year Student

I am sorry but i don't see anything related to the terminal in the codes you have send

do_filp_open function ???? You will have to trace through the calls. If I provide all the links there will be 30 odd links without any coherence. Trace through the do_filp_open function and it will lead you there.

I don't think i know that well how to find information in the kernel :D sorry