Sleep Countdown

#include <stdio.h>
#include <stdlib.h>
#ifdef _WIN32
  #include <io.h>
  #include <dos.h>
  #include <windows.h>
#endif
#ifdef __unix__
  #include <unistd.h>
  #include <time.h>
#endif
int SecondsToSleep;
int SecondsLeft;
int ShowHelp;
int main(int argc, char* argv[]){
  if(argc == 1){
    ShowHelp = 1;
  }else{
    SecondsLeft = atoi(argv[1]);
    if(SecondsLeft == 0){
      ShowHelp = 1;
    }else{
      printf("Counting down... ");
      fflush(stdout);
      while(SecondsLeft > 0){
        printf("%i.. ", SecondsLeft);
        fflush(stdout);
        #ifdef _WIN32
          Sleep(1000);
        #endif
        #ifdef __unix__
          sleep(1);
        #endif
        SecondsLeft = SecondsLeft - 1;
      }
      printf("\n");
    }
  }
  if(ShowHelp == 1){
    printf("Sleep Countdown v1.1 - Jaap-willem Dooge\n\n");
    printf(" SleepCD <seconds>\n\n");
    fflush(stdout);
  }
  return 0;
}