fflush() is not working in Linux

Question

I used the fflush() in Linux GCC but it did not work. Are there any alternatives for that function? Here is my code:

#include<stdio.h>
void main()
{
  char ch='y';
  while(ch=='y')
  {
    int a;
    printf("Enter some value:");
    scanf("%d",&a);
    fflush(stdin);
    printf("Do you want to continue?");
    scanf("%c",&ch)
  }

The output that I got is:

Enter some value: 10

Then the program ends. That's all. What can I do in Linux? Is there an alternative function?

Answer 1

Don't use fflush, use this function instead:

#include <stdio.h>
void clean_stdin(void)
{
    int c;
    do {
        c = getchar();
    } while (c != '\n' && c != EOF);
}

fflush(stdin) depends of the implementation, but this function always works. In C, it is considered bad practice to use fflush(stdin).