bomber

#include <stdio.h>
   #include <time.h>

    int validate (int d, int m, int y,char sep1,char sep2)
    {
        int daysofeachmonth[13]={31,28,31,30,31,30,31,31,30,31,30,31};
       if ((y%4==0 && y%100!=0||y%400==0) && d==29 && m==2)
           return 0;
       else if (daysofeachmonth[m-1]<d || d==0) {
           printf("The date you entered is invalid, please enter a valid date.\n");
           return 1; }
       else if (1>m && m>12){
           fprintf(stderr, "The date you entered is invalid, please enter a valid date.\n");
           return 1; }
       else if (0>=y && y>=10000) {
           fprintf(stderr, "The date you entered is invalid, please enter a valid date.\n");
           return 1; }
       else if ((sep1!=sep2 && sep1!="/") || (sep1!=sep2 && sep1!="-")){
           fprintf(stderr, "The date you entered is invalid, please enter a valid date.\n");
           return 1;}
       else
       return 0;
    }

    int rangeofdates ()
   {
       int error=1, n;
       do
       {scanf("%d", &n);
        if (n<1 || n>30)
       fprintf(stderr, "The number you entered is invalid, please enter a valid number between 1 and 30.\n");
       else error=0;
       }while(error==1);
       return n;
   }

   int compare(const void * x, const void * y)
   {
      return( *(int*)x - *(int*)y );
   }

   int main ()
   {
     int i, n;
     n=rangeofdates();
     time_t dates[n];

       for (i=0; i<n; i++){
           int d,m,y;
           char sep1, sep2;
           struct tm datestruct;
           int error=1;
           time_t tempdate;
           do{
             fflush(stdin);
             scanf("%d%c%d%c%d", &d,&sep1,&m,&sep2,&y);
             printf("%d %d %d\n", d,m,y);
             error=validate(d, m, y, sep1, sep2);
           }while(error==1);

           datestruct.tm_hour = 0;  datestruct.tm_min = 0; datestruct.tm_sec = 0;
           datestruct.tm_mday = d; datestruct.tm_mon = m-1; datestruct.tm_year = y-1900;
           datestruct.tm_isdst = 0;
           tempdate = mktime(&datestruct);
           dates[i]= tempdate;
   }
   qsort(dates, n, sizeof(dates), compare);
   int j;
   for (j=0; j<n; j++){
   printf(ctime(&dates[j]));
   }
   return 0;
   }