How to clear stdin before getting new input?

by

How to clear stdin before getting new input?
.. so I need something with the same functionality.

With portable C this is not possible.

Instead suggest a different (and more usual C) paradigm:
Insure previous input functions consumes all the previous input.

fgets() (or *nix getline()) is the typical approach and solves most situations.

Or roll your own. The following reads an entire line, but does not save extra input.

int mygetline(char *buf, size_t size) {
  assert(size > 0 && size <= INT_MAX);
  size_t i = 0;
  int ch;
  while ((ch = fgetc(stdin)) != EOF) {  // Read until EOF ...
    if (i + 1 < size) {
      buf[i++] = ch;
    }
    if (ch == '\n') {  // ... or end of line
      break;  
    }
  } 
  buf[i] = '\0';
  if (i == 0) { 
    return EOF;
  }
  return i;
}

More Related Contents:

  1. setvbuf not able to make stdin unbuffered
  2. why the program is not terminating in gcc? [closed]
  3. Using fflush(stdin)
  4. How do I read a string entered by the user in C?
  5. How to avoid pressing Enter with getchar() for reading a single character only?
  6. What is the equivalent to getch() & getche() in Linux?
  7. How to read a line from the console in C?
  8. Why doesn’t getchar() wait for me to press enter after scanf()?
  9. I am not able to flush stdin. How can I flush stdin in C?
  10. How to simulate an EOF?
  11. `getchar()` gives the same output as the input string
  12. Why do I need to type Ctrl-D twice to mark end-of-file?
  13. Using fseek with a file pointer that points to stdin
  14. fflush(stdin) function does not work
  15. Read from file or stdin
  16. C read binary stdin
  17. Read input.txt file and also output.bmp file from terminal (C-programming)
  18. Writing to stdin and reading from stdout (UNIX/LINUX/C Programming)
  19. int c = getchar()?
  20. How to properly flush stdin in fgets loop
  21. getchar does not stop when using scanf
  22. Why Ctrl-Z does not trigger EOF?
  23. How to read from stdin with fgets()?
  24. Scanf/Printf double variable C
  25. Is there any way to peek at the stdin buffer?
  26. Using getchar() in a while loop
  27. Why do i have to input EOF 3 times when using fgets?
  28. Reading from stdin
  29. Using getchar() on c gets the ‘Enter’ after input [duplicate]
  30. How to read terminal’s input buffer immediately after keypress

Leave a Comment