#include <stdio.h>

int main(){

  char ans;
  printf("Do you want to keep playing? (y/n)");
  ans = getchar();
  printf("you entered: %c\n", ans);

  while(ans=='y'){
      printf("running loop!\n");
      sleep(1);
  }

  if(ans=='n'){
      printf("exiting program: you entered 'n'\n");
  }else{
      printf("exiting program: invalid entry\n");
  }

  return 0;

}