Replacement of fflush(stdin)

Question

I have the below code,

fflush(stdin);
print(\"Enter y/n\");
scanf(\"%c\",&a);

Here,it is quitting before giving the input.it looks like

Answer 1

For C on GNU

you can use

__fpurge(stdin);

include stdio_ext.h header for accessing the function. Though the post is very old still I thought this might help some linux developers.

Answer 2

scanf(" %c",&c);

or

scanf(" ");
//reading operation (gets(), fgets(stdin,...) etc)

Spaces in the scanf() format string will ignore any whitespace until the first non-whitespace.

Answer 3

This is well explained in the C FAQ. See also: explanation. The proposed solutions:

• Quit using scanf. Use fgets and the sscanf

• Use this to eat the newline

  while((c = getchar()) != '\n' && c != EOF)
  /* discard the character */;
  

The fact that flushing stdin works on some implementations is wrong.

Some vendors do implement fflush so that fflush(stdin) discards unread characters, although portable programs cannot depend on this.