Fgets() requires enter to be hit twice after reading to char array (only if stdin is empty)

exemple 1: data.txt | ./exec -c 123456 ( it works only by clicking once on enter)

exemple2: ./exec -c 123456( I need to click twice on enter)

I tried this with no sucess

any help will be greatly appreciated *

any help will be greatly appreciated *

Wait a dozen minutes and repost your link to your code

👍

how can I randomly exchange the characters of a string?

@NICOOH std::string blah = "BLAH"; random_shuffle( blah.begin(), blah.end() );

[Error] could not convert 'std::random_shuffle<__gnu_cxx::__normal_iterator<char*, std::basic_string<char> > >(s.std::basic_string<_CharT, _Traits, _Alloc>::begin<char, std::char_traits<char>, std::allocator<char> >(), s.std::basic_string<_CharT, _Traits, _Alloc>::end<char, std::char_traits<char>, std::allocator<char> >())' from 'void' to 'std::string {aka std::basic_string<char>}'

😭😭😭😭😭

How to solve?

compiles under gcc 8.2

https://godbolt.org/z/VJnO9g

anyone know that what is wrong here. i use header file conio.h but wenn i compile it gave a error there is no header file.i think that is impossible what can i do ?

good to know @vehlwn, thx

anyone know that what is wrong here. i use header file conio.h but wenn i compile it gave a error there is no header file.i think that is impossible what can i do ?

i use visual studio that there is error

i use visual studio that there is error

Which version of it

Give us details

And what you tried to solve the problem

Which version of it

the latest version .

i use visual studio that there is error

Copy the error message and try to present as much information on your problem as you have

Even if I already know the solution

He is on VS

Like I said, I know how to solve his problem but will not do if he makes no efforts

ok let,s me explain it a few minute later it's ok ?

#howtoask

Oh yeah that's what I wanted

I've tried random_shuffle() with VS 2017 Community Edition. Works perfectly fine. The sample compiles, linkes and executes...

I've tried random_shuffle() with VS 2017 Community Edition. Works perfectly fine. The sample compiles, linkes and executes...

Yeah, but you should just use shuffle now iirc

Or something along those lines

sure @QNeko . I just wanted to understand what the problem is with random_shuffle() on VS 2017. shuffle() is the way to go

sure @QNeko . I just wanted to understand what the problem is with random_shuffle() on VS 2017. shuffle() is the way to go

Maybe it is removed completely by some compiler flags

And replaced by a using random_shuffle = void;

Perhaps. But good to know, that random_shuffle() is removed by the standard even if the compilers have not adopted it yet or it is compiler flag depended.

[Error] could not convert 'std::random_shuffle<__gnu_cxx::__normal_iterator<char*, std::basic_string<char> > >(s.std::basic_string<_CharT, _Traits, _Alloc>::begin<char, std::char_traits<char>, std::allocator<char> >(), s.std::basic_string<_CharT, _Traits, _Alloc>::end<char, std::char_traits<char>, std::allocator<char> >())' from 'void' to 'std::string {aka std::basic_string<char>}'

Oh wait that is gcc

So yeah removed

Gone

Perhaps. But good to know, that random_shuffle() is removed by the standard even if the compilers have not adopted it yet or it is compiler flag depended.

Some would have just marked it deprecated

"[...] from 'void' to 'std::string {aka std::basic_string<char>}'" now I see. You are right @QNeko :)

"[...] from 'void' to 'std::string {aka std::basic_string<char>}'" now I see. You are right @QNeko :)

Habit of handling C++ like it is Haskell in disguise

compiles under gcc 8.2

i use gcc 4.9.2

hmm according to compiler explorer, the code compier under 4.9.2, too https://godbolt.org/z/-aX7F3 But as already said, shuffle() is the way to go as random_shuffle() is depricated

Hi

[Error] ld returned 1 exit status

I'm nervous

ahahaah

Hello guys. I dont understand the logic of this: char *p=“abcd”;

Pointers point an adress right ? Does “abcd” even have an address ?

Well… it exists somewhere it memory

Shouldnt we do this char ch[]=“abcd”; so it can have an address

They both do

But

char ch[] = "abcd"; is a special kind of initialization of char arrays as far as I know

It will create an unique instance of char ch[] = { 'a', 'b', 'c', 'd', '\0' }; that you will be able to modify the contents of

char *p = "abcd"; is not really safe because in this case "abcd" may be created in read-only memory, may be created only once in the entire compiled object file or program

const char *p = "abcd"; is safe

But there will be differences regarding sizeof also

The same as between any array and any pointer

Okay, I guess I understand

Thank you

I've tried random_shuffle() with VS 2017 Community Edition. Works perfectly fine. The sample compiles, linkes and executes...

visual studio never follows the standard strictly

hmm according to compiler explorer, the code compier under 4.9.2, too https://godbolt.org/z/-aX7F3 But as already said, shuffle() is the way to go as random_shuffle() is depricated

it doesn't work shuffle and random_shuffle

It worked for me in VS 2017. I've tried it some minutes ago @NICOOH I honestly don't understand what is different on your system

@NICOOH are you an organic acid?

@ariana1429 was my pun good?

@NICOOH are you an organic acid?

No😂

It worked for me in VS 2017. I've tried it some minutes ago @NICOOH I honestly don't understand what is different on your system

can I send you my code to figure out if I'm stupid or the compiler is stupid?

Sure, send it. I'm curious why it is working on my machine but not on yours

wrong compiler version?

@linuxer4fun I tried it with the same compiler version with the online compiler. it compiled well

it does not send me the link

Try to post the plain source code if it is not much. I hope this is allowed for new users

#include <iostream> #include <string> #include <time.h> #include <windows.h> #include <stdio.h> using namespace std; string PBOX1(string s){ string s1; s1=random_shuffle(s.begin(),s.end()); return s1; } int main(int argc, char** argv) { string s1; cin>>s1; cout<<s1; string s2=PBOX1(s1); cout<<endl<<s2; return 0;}

aaaah

I see

#include <algorithm>

random_shuffle() doesn't return anything, it modifies your input

so remove the assignment to s1

or just... wait a sec ;)