Cygwin can't compile c with gcc -

i trying compile c program cygwin , gcc. using windows 8.1

i following error ...

/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../lib/libcygwin.a(libcmain.o): in function `main': /usr/src/debug/cygwin-1.7.35-1/winsup/cygwin/lib/libcmain.c:39: undefined reference `winmain' /usr/src/debug/cygwin-1.7.35-1/winsup/cygwin/lib/libcmain.c:39:(.text.startup+0x7e): relocation truncated fit: r_x86_64_pc32 against undefined symbol `winmain' collect2: error: ld returned 1 exit status 

does know going on here?

my code looks ... (taken link removed... page full of ads)

edit: link : http://c.learncodethehardway.org/book/ex14.html

#include <stdio.h> #include <ctype.h>  // forward declarations int can_print_it(char ch); void print_letters(char arg[]);  void print_arguments(int argc, char *argv[]) {     int = 0;      for(i = 0; < argc; i++) {         print_letters(argv[i]);     } }  void print_letters(char arg[]) {     int = 0;      for(i = 0; arg[i] != '\0'; i++) {         char ch = arg[i];          if(can_print_it(ch)) {             printf("'%c' == %d ", ch, ch);         }     }      printf("\n"); }  int can_print_it(char ch) {     return isalpha(ch) || isblank(ch); }   int main(int argc, char *argv[]) {     print_arguments(argc, argv);     return 0; } 

on command line run ...

gcc learn.c -wall -o learnc.exe 

i run code yesterday. have not made change system settings or file structure.

thanks!