#include <stdio.h>

int cont()
{
  char c; do {
    printf("Continue (y/n): ");
    scanf("%c", &c);
    printf("Input '%c'\n", c);
  } while (c != 'y' && c != 'n');
  return c == 'y';
}

int main()
{
  int i = 0;
  do {
    printf("Loop iteration %d.\n", ++i);
  } while (cont());
  /* done */
  return 0;
}