Stack Overflow
Stack Overflow

Questions tagged [fflush]

The C standard library `fflush` is used to synchronize the stream on which it is invoked with the actual content of the corresponding file. It can be used only on output streams. A similar function is defined in C++ as `std::fflush`.

The C standard library function fflush function is defined in the <stdio.h> header and its documentation can be found here.

The corresponding C++ standard library function std::fflush is defined in <cstdio> header and documented here.

197 questions
0
votes
2 answers

Is this buffer overflow?

Really confused if my program is behaving the way it's supposed to. this isn't homework, just a fun march madness predictor program I'm writing. char buffer[20]; char team1_name[20]; // 18 chars + new line + null char…
Tim
  • 284
  • 1
  • 4
  • 20
0
votes
0 answers

Infinite do-while loop with input

I am trying to make a Bank Manager Program. For some reason, it turns into an infinite loop when receiving the wrong input. Whenever I try to have an input of something like "Pizza", it constantly repeats the do-while loop that keeps on printing the…
Username008445
  • 1
  • 2
0
votes
1 answer

what is practical differences between flush, write() and fflush()?

In this post, the answer said Flushing: To sync the temporary state of your application data with the permanent state of the data (in a database, or on disk). I think that the flush is executed when some buffer is written to an i/o device (like…
3088 K
  • 75
  • 5
0
votes
1 answer

Select always returns 0 in an input file

Select always returns 0 in an input file I wrote a function function that receives FILE* and checks if it is ready. The function: int ioManager_nextReady(FILE *IFILE) { // Setting input ifle int inDescrp = fileno(IFILE ? IFILE : stdin); //…
Learner
  • 7
  • 4
0
votes
0 answers

Using fflush in file operation takes more than a second

I need to write all logs in a single file by using a buffer. This buffer can be accessed by different threads and logs can be written, This is protected under a critical section Sometimes I observed a delay of 1 second in writing the buffer into…
Jeyanth Inba
  • 1
  • 1
0
votes
1 answer

I am trying to update the command line output 3 times using \r in C, but why does it skip over my second printf statement?

Here is my code: #include #include int main() { printf("hello"); sleep(1); fflush(stdout); printf("\rworld"); sleep(1); fflush(stdout); printf("\r! \n"); sleep(1); return 0; } It displays…
Anivartin Anand
  • 19
  • 6
0
votes
3 answers

using fflush on C++

Can someone help me using fflush in C++ Here is a sample code in C #include using namespace std; int a,b,i; char result[20]; int main() { scanf("%d %d\n", &a, &b); for (i=1; i<=10; i++) { printf("5\n"); fflush(stdout); …
zeulb
  • 637
  • 1
  • 7
  • 23
0
votes
0 answers

printf prints text two times in while loop even after fflushing stdin after scanf

So, this is the code, it takes input, inserts/sorts depending on choice, now the problem is in the input part, Somehow getchar misses a cycle every time. I know this is related to stdin and ENTER but I tried flushing it, I still got the same bad…
dfmaaa1
  • 67
  • 6
0
votes
0 answers

How to flush cin in c++ properly?

int n; cin>>n; if(cin.fail()){ cin.clear(); cin.ignore(numeric_limits::max(),\n); cout<<"Data is not numeric"; } else{ cout<
radx
  • 1
0
votes
1 answer

intricacies/understanding the stdio buffer and dup2

I am reading this lecture and found this following code sample which I modified to this: #include #include #include #include #include #include int main() { int fd; char *s, *t; …
Singh
  • 55
  • 1
  • 6
0
votes
0 answers

fwrite() modifying a file in place without fflush() lead to error

write_test() reads file contents and write it back just in place, why would it fail without calling fflush()? Without calling fflush(), file contents would be in a mess if the file size is several times larger than BUFFSIZE, and the while loop never…
Rorschach
  • 60
  • 4
0
votes
0 answers

fflush(stdout) not working but \n' works in C language

I was working on a homework problem when I encounter this error, fflush inside main function in main.c is not working I tried the code in ubuntu local system and in repl.it and the output does not contain "#include" line from sample.c , The only…
Karthik Raja Anandan
  • 61
  • 1
  • 7
0
votes
0 answers

I am trying to take two input dates in vscode in windows in GNU g++ compiler. But I get first date set to zero after I enter second date?

When given the first.date in the first print output the result is good. But as soon as the second scanf line comes into picture it changes the first.date value to zero. So in the last printf line the first.date shows zero always. Here is sample…
Rakesh Solanki
  • 59
  • 6
0
votes
0 answers

Scanf executed before printf even with fflush(stdout)

The program I wrote should in theory ask for the character to censor with printf and then execute scanf, but printf is shown on the terminal after scanf. I read about the buffer problem but even after using fflush(stdout) after printf, scanf still…
user17864936
0
votes
0 answers

Does Linux Shell execute fflush(stdout) first before executing and writing the result of the command passed by the user?

Let's say that I want to know my current working directory, so I type pwd in the prompt and press Enter. Before getting my current working directory path, does the Linux Shell execute fflush(stdout) FIRST, and then do its stuff to return the…
NoahVerner
  • 937
  • 2
  • 9
  • 24
1 2 3
…
13 14