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Program 4

answer askUser(char *question){
  char ch;
  do {
    printf("%s [y/n]? ", question);
    while (isspace(ch = fgetc(stdin)));
    if (ch == 'y') 
      return yes;
    else if (ch == 'n')
      return no;}
  while (ch != 'y' || ch != 'n');
}