#include <stdio.h>

int main(void) {

  char answer;

  do {
    printf("Answer yes or no (y/n): ");
    scanf(" %c", &answer);
  } while (answer != 'y' && answer != 'n');

  printf("The answer is %s\n\n", 
          answer == 'y'? "yes" : "no");
  
  return 0;
}