//12days.c  --- godmessage in plain text -- by tsaiwn@csie.nctu.edu.tw
char *num[ ]={"a","two","three", "four", "five", "six", "seven","eight",
"nine", "ten", "eleven", "twelve"},*days[38]={"first","second","third",
"fourth","fifth","sixth" ,"seventh","eight","ninth","tenth","eleventh","twelth"},
*some[ ]={"Drummers drumming","Pipers piping", "Lords a-leaping","Ladies"
" danching", "Maids a-milking", "Swans a-swiming","Gees a-laying","Gold rings",
 "Calling birds", "French hens","Turtle doves", "Partridge in a pear tree"};
void fun(i, k){if(i==12)return; if(k==i)printf(
   "\nOn the %s day of Christmas my true love sent to me\n",days[i]);
   printf("%s%s %s%s%s", (i>0)&&(k==0)?"\nand ":"",  num[k],some[11-k],
   k==0?".\n":", ",   (k==4 || k==6 || k==9) ?"\n":"");
   k>0? fun(i,k-1):fun(i+1,i+1);  }  void main( ) {fun(0,0);
  system("explorer http://www.csie.nctu.edu.tw/~tsaiwn/introcs/12days.htm");
#ifdef __TURBOC__
  printf(" ... happy new year ..  You are using Turbo C++ ...");
#endif
#ifdef __GNUC__
  printf(" Happy Christmas! .. you are using gcc..");
#endif
getchar( );}